diff --git a/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document.proto b/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document.proto
index f476f0501e7..74184552a92 100644
--- a/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document.proto
+++ b/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document.proto
@@ -893,6 +893,160 @@ message Document {
     repeated Provenance provenance = 3 [deprecated = true];
   }
 
+  // Represents the parsed layout of a document as a collection of blocks that
+  // the document is divided into.
+  message DocumentLayout {
+    // Represents a block. A block could be one of the various types (text,
+    // table, list) supported.
+    message DocumentLayoutBlock {
+      // Represents where the block starts and ends in the document.
+      message LayoutPageSpan {
+        // Page where block starts in the document.
+        int32 page_start = 1;
+
+        // Page where block ends in the document.
+        int32 page_end = 2;
+      }
+
+      // Represents a text type block.
+      message LayoutTextBlock {
+        // Text content stored in the block.
+        string text = 1;
+
+        // Type of the text in the block. Available options are: `paragraph`,
+        // `subtitle`, `heading-1`, `heading-2`, `heading-3`, `heading-4`,
+        // `heading-5`, `header`, `footer`.
+        string type = 2;
+
+        // A text block could further have child blocks.
+        // Repeated blocks support further hierarchies and nested blocks.
+        repeated DocumentLayoutBlock blocks = 3;
+      }
+
+      // Represents a table type block.
+      message LayoutTableBlock {
+        // Header rows at the top of the table.
+        repeated LayoutTableRow header_rows = 1;
+
+        // Body rows containing main table content.
+        repeated LayoutTableRow body_rows = 2;
+
+        // Table caption/title.
+        string caption = 3;
+      }
+
+      // Represents a row in a table.
+      message LayoutTableRow {
+        // A table row is a list of table cells.
+        repeated LayoutTableCell cells = 1;
+      }
+
+      // Represents a cell in a table row.
+      message LayoutTableCell {
+        // A table cell is a list of blocks.
+        // Repeated blocks support further hierarchies and nested blocks.
+        repeated DocumentLayoutBlock blocks = 1;
+
+        // How many rows this cell spans.
+        int32 row_span = 2;
+
+        // How many columns this cell spans.
+        int32 col_span = 3;
+      }
+
+      // Represents a list type block.
+      message LayoutListBlock {
+        // List entries that constitute a list block.
+        repeated LayoutListEntry list_entries = 1;
+
+        // Type of the list_entries (if exist). Available options are `ordered`
+        // and `unordered`.
+        string type = 2;
+      }
+
+      // Represents an entry in the list.
+      message LayoutListEntry {
+        // A list entry is a list of blocks.
+        // Repeated blocks support further hierarchies and nested blocks.
+        repeated DocumentLayoutBlock blocks = 1;
+      }
+
+      oneof block {
+        // Block consisting of text content.
+        LayoutTextBlock text_block = 2;
+
+        // Block consisting of table content/structure.
+        LayoutTableBlock table_block = 3;
+
+        // Block consisting of list content/structure.
+        LayoutListBlock list_block = 4;
+      }
+
+      // ID of the block.
+      string block_id = 1;
+
+      // Page span of the block.
+      LayoutPageSpan page_span = 5;
+    }
+
+    // List of blocks in the document.
+    repeated DocumentLayoutBlock blocks = 1;
+  }
+
+  // Represents the chunks that the document is divided into.
+  message ChunkedDocument {
+    // Represents a chunk.
+    message Chunk {
+      // Represents where the chunk starts and ends in the document.
+      message ChunkPageSpan {
+        // Page where chunk starts in the document.
+        int32 page_start = 1;
+
+        // Page where chunk ends in the document.
+        int32 page_end = 2;
+      }
+
+      // Represents the page header associated with the chunk.
+      message ChunkPageHeader {
+        // Header in text format.
+        string text = 1;
+
+        // Page span of the header.
+        ChunkPageSpan page_span = 2;
+      }
+
+      // Represents the page footer associated with the chunk.
+      message ChunkPageFooter {
+        // Footer in text format.
+        string text = 1;
+
+        // Page span of the footer.
+        ChunkPageSpan page_span = 2;
+      }
+
+      // ID of the chunk.
+      string chunk_id = 1;
+
+      // Unused.
+      repeated string source_block_ids = 2;
+
+      // Text content of the chunk.
+      string content = 3;
+
+      // Page span of the chunk.
+      ChunkPageSpan page_span = 4;
+
+      // Page headers associated with the chunk.
+      repeated ChunkPageHeader page_headers = 5;
+
+      // Page footers associated with the chunk.
+      repeated ChunkPageFooter page_footers = 6;
+    }
+
+    // List of chunks.
+    repeated Chunk chunks = 1;
+  }
+
   // Original source document from the user.
   oneof source {
     // Optional. Currently supports Google Cloud Storage URI of the form
@@ -944,4 +1098,10 @@ message Document {
 
   // Placeholder. Revision history of this document.
   repeated Revision revisions = 13;
+
+  // Parsed layout of the document.
+  DocumentLayout document_layout = 17;
+
+  // Document chunked based on chunking config.
+  ChunkedDocument chunked_document = 18;
 }
diff --git a/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_processor_service.proto b/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_processor_service.proto
index 102f5bae37e..a5571cc1879 100644
--- a/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_processor_service.proto
+++ b/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_processor_service.proto
@@ -328,6 +328,23 @@ service DocumentProcessorService {
 
 // Options for Process API
 message ProcessOptions {
+  // Serving config for layout parser processor.
+  message LayoutConfig {
+    // Serving config for chunking.
+    message ChunkingConfig {
+      // Optional. The chunk sizes to use when splitting documents, in order of
+      // level.
+      int32 chunk_size = 1 [(google.api.field_behavior) = OPTIONAL];
+
+      // Optional. Whether or not to include ancestor headings when splitting.
+      bool include_ancestor_headings = 2
+          [(google.api.field_behavior) = OPTIONAL];
+    }
+
+    // Optional. Config for chunking in layout parser processor.
+    ChunkingConfig chunking_config = 1 [(google.api.field_behavior) = OPTIONAL];
+  }
+
   // A list of individual page numbers.
   message IndividualPageSelector {
     // Optional. Indices of the pages (starting from 1).
@@ -356,6 +373,10 @@ message ProcessOptions {
   // Returns error if set on other processor types.
   OcrConfig ocr_config = 1;
 
+  // Optional. Only applicable to `LAYOUT_PARSER_PROCESSOR`.
+  // Returns error if set on other processor types.
+  LayoutConfig layout_config = 9 [(google.api.field_behavior) = OPTIONAL];
+
   // Optional. Override the schema of the
   // [ProcessorVersion][google.cloud.documentai.v1.ProcessorVersion]. Will
   // return an Invalid Argument error if this field is set when the underlying
diff --git a/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/processor.proto b/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/processor.proto
index 03d58269085..6b86a0ab327 100644
--- a/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/processor.proto
+++ b/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/processor.proto
@@ -128,6 +128,12 @@ message ProcessorVersion {
 
   // Output only. The model type of this processor version.
   ModelType model_type = 15 [(google.api.field_behavior) = OUTPUT_ONLY];
+
+  // Output only. Reserved for future use.
+  bool satisfies_pzs = 16 [(google.api.field_behavior) = OUTPUT_ONLY];
+
+  // Output only. Reserved for future use.
+  bool satisfies_pzi = 17 [(google.api.field_behavior) = OUTPUT_ONLY];
 }
 
 // Contains the alias and the aliased resource name of processor version.
@@ -224,4 +230,10 @@ message Processor {
   // The [KMS key](https://cloud.google.com/security-key-management) used for
   // encryption and decryption in CMEK scenarios.
   string kms_key_name = 8;
+
+  // Output only. Reserved for future use.
+  bool satisfies_pzs = 12 [(google.api.field_behavior) = OUTPUT_ONLY];
+
+  // Output only. Reserved for future use.
+  bool satisfies_pzi = 13 [(google.api.field_behavior) = OUTPUT_ONLY];
 }
diff --git a/packages/google-cloud-contentwarehouse/protos/protos.d.ts b/packages/google-cloud-contentwarehouse/protos/protos.d.ts
index f18b6cdaf63..950b5f54d2e 100644
--- a/packages/google-cloud-contentwarehouse/protos/protos.d.ts
+++ b/packages/google-cloud-contentwarehouse/protos/protos.d.ts
@@ -13387,6 +13387,12 @@ export namespace google {
 
                     /** Document revisions */
                     revisions?: (google.cloud.documentai.v1.Document.IRevision[]|null);
+
+                    /** Document documentLayout */
+                    documentLayout?: (google.cloud.documentai.v1.Document.IDocumentLayout|null);
+
+                    /** Document chunkedDocument */
+                    chunkedDocument?: (google.cloud.documentai.v1.Document.IChunkedDocument|null);
                 }
 
                 /** Represents a Document. */
@@ -13434,6 +13440,12 @@ export namespace google {
                     /** Document revisions. */
                     public revisions: google.cloud.documentai.v1.Document.IRevision[];
 
+                    /** Document documentLayout. */
+                    public documentLayout?: (google.cloud.documentai.v1.Document.IDocumentLayout|null);
+
+                    /** Document chunkedDocument. */
+                    public chunkedDocument?: (google.cloud.documentai.v1.Document.IChunkedDocument|null);
+
                     /** Document source. */
                     public source?: ("uri"|"content");
 
@@ -17820,6 +17832,1499 @@ export namespace google {
                          */
                         public static getTypeUrl(typeUrlPrefix?: string): string;
                     }
+
+                    /** Properties of a DocumentLayout. */
+                    interface IDocumentLayout {
+
+                        /** DocumentLayout blocks */
+                        blocks?: (google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock[]|null);
+                    }
+
+                    /** Represents a DocumentLayout. */
+                    class DocumentLayout implements IDocumentLayout {
+
+                        /**
+                         * Constructs a new DocumentLayout.
+                         * @param [properties] Properties to set
+                         */
+                        constructor(properties?: google.cloud.documentai.v1.Document.IDocumentLayout);
+
+                        /** DocumentLayout blocks. */
+                        public blocks: google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock[];
+
+                        /**
+                         * Creates a new DocumentLayout instance using the specified properties.
+                         * @param [properties] Properties to set
+                         * @returns DocumentLayout instance
+                         */
+                        public static create(properties?: google.cloud.documentai.v1.Document.IDocumentLayout): google.cloud.documentai.v1.Document.DocumentLayout;
+
+                        /**
+                         * Encodes the specified DocumentLayout message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.verify|verify} messages.
+                         * @param message DocumentLayout message or plain object to encode
+                         * @param [writer] Writer to encode to
+                         * @returns Writer
+                         */
+                        public static encode(message: google.cloud.documentai.v1.Document.IDocumentLayout, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                        /**
+                         * Encodes the specified DocumentLayout message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.verify|verify} messages.
+                         * @param message DocumentLayout message or plain object to encode
+                         * @param [writer] Writer to encode to
+                         * @returns Writer
+                         */
+                        public static encodeDelimited(message: google.cloud.documentai.v1.Document.IDocumentLayout, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                        /**
+                         * Decodes a DocumentLayout message from the specified reader or buffer.
+                         * @param reader Reader or buffer to decode from
+                         * @param [length] Message length if known beforehand
+                         * @returns DocumentLayout
+                         * @throws {Error} If the payload is not a reader or valid buffer
+                         * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                         */
+                        public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.DocumentLayout;
+
+                        /**
+                         * Decodes a DocumentLayout message from the specified reader or buffer, length delimited.
+                         * @param reader Reader or buffer to decode from
+                         * @returns DocumentLayout
+                         * @throws {Error} If the payload is not a reader or valid buffer
+                         * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                         */
+                        public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.DocumentLayout;
+
+                        /**
+                         * Verifies a DocumentLayout message.
+                         * @param message Plain object to verify
+                         * @returns `null` if valid, otherwise the reason why it is not
+                         */
+                        public static verify(message: { [k: string]: any }): (string|null);
+
+                        /**
+                         * Creates a DocumentLayout message from a plain object. Also converts values to their respective internal types.
+                         * @param object Plain object
+                         * @returns DocumentLayout
+                         */
+                        public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.DocumentLayout;
+
+                        /**
+                         * Creates a plain object from a DocumentLayout message. Also converts values to other types if specified.
+                         * @param message DocumentLayout
+                         * @param [options] Conversion options
+                         * @returns Plain object
+                         */
+                        public static toObject(message: google.cloud.documentai.v1.Document.DocumentLayout, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                        /**
+                         * Converts this DocumentLayout to JSON.
+                         * @returns JSON object
+                         */
+                        public toJSON(): { [k: string]: any };
+
+                        /**
+                         * Gets the default type url for DocumentLayout
+                         * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                         * @returns The default type url
+                         */
+                        public static getTypeUrl(typeUrlPrefix?: string): string;
+                    }
+
+                    namespace DocumentLayout {
+
+                        /** Properties of a DocumentLayoutBlock. */
+                        interface IDocumentLayoutBlock {
+
+                            /** DocumentLayoutBlock textBlock */
+                            textBlock?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock|null);
+
+                            /** DocumentLayoutBlock tableBlock */
+                            tableBlock?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock|null);
+
+                            /** DocumentLayoutBlock listBlock */
+                            listBlock?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock|null);
+
+                            /** DocumentLayoutBlock blockId */
+                            blockId?: (string|null);
+
+                            /** DocumentLayoutBlock pageSpan */
+                            pageSpan?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan|null);
+                        }
+
+                        /** Represents a DocumentLayoutBlock. */
+                        class DocumentLayoutBlock implements IDocumentLayoutBlock {
+
+                            /**
+                             * Constructs a new DocumentLayoutBlock.
+                             * @param [properties] Properties to set
+                             */
+                            constructor(properties?: google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock);
+
+                            /** DocumentLayoutBlock textBlock. */
+                            public textBlock?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock|null);
+
+                            /** DocumentLayoutBlock tableBlock. */
+                            public tableBlock?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock|null);
+
+                            /** DocumentLayoutBlock listBlock. */
+                            public listBlock?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock|null);
+
+                            /** DocumentLayoutBlock blockId. */
+                            public blockId: string;
+
+                            /** DocumentLayoutBlock pageSpan. */
+                            public pageSpan?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan|null);
+
+                            /** DocumentLayoutBlock block. */
+                            public block?: ("textBlock"|"tableBlock"|"listBlock");
+
+                            /**
+                             * Creates a new DocumentLayoutBlock instance using the specified properties.
+                             * @param [properties] Properties to set
+                             * @returns DocumentLayoutBlock instance
+                             */
+                            public static create(properties?: google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock;
+
+                            /**
+                             * Encodes the specified DocumentLayoutBlock message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.verify|verify} messages.
+                             * @param message DocumentLayoutBlock message or plain object to encode
+                             * @param [writer] Writer to encode to
+                             * @returns Writer
+                             */
+                            public static encode(message: google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                            /**
+                             * Encodes the specified DocumentLayoutBlock message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.verify|verify} messages.
+                             * @param message DocumentLayoutBlock message or plain object to encode
+                             * @param [writer] Writer to encode to
+                             * @returns Writer
+                             */
+                            public static encodeDelimited(message: google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                            /**
+                             * Decodes a DocumentLayoutBlock message from the specified reader or buffer.
+                             * @param reader Reader or buffer to decode from
+                             * @param [length] Message length if known beforehand
+                             * @returns DocumentLayoutBlock
+                             * @throws {Error} If the payload is not a reader or valid buffer
+                             * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                             */
+                            public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock;
+
+                            /**
+                             * Decodes a DocumentLayoutBlock message from the specified reader or buffer, length delimited.
+                             * @param reader Reader or buffer to decode from
+                             * @returns DocumentLayoutBlock
+                             * @throws {Error} If the payload is not a reader or valid buffer
+                             * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                             */
+                            public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock;
+
+                            /**
+                             * Verifies a DocumentLayoutBlock message.
+                             * @param message Plain object to verify
+                             * @returns `null` if valid, otherwise the reason why it is not
+                             */
+                            public static verify(message: { [k: string]: any }): (string|null);
+
+                            /**
+                             * Creates a DocumentLayoutBlock message from a plain object. Also converts values to their respective internal types.
+                             * @param object Plain object
+                             * @returns DocumentLayoutBlock
+                             */
+                            public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock;
+
+                            /**
+                             * Creates a plain object from a DocumentLayoutBlock message. Also converts values to other types if specified.
+                             * @param message DocumentLayoutBlock
+                             * @param [options] Conversion options
+                             * @returns Plain object
+                             */
+                            public static toObject(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                            /**
+                             * Converts this DocumentLayoutBlock to JSON.
+                             * @returns JSON object
+                             */
+                            public toJSON(): { [k: string]: any };
+
+                            /**
+                             * Gets the default type url for DocumentLayoutBlock
+                             * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                             * @returns The default type url
+                             */
+                            public static getTypeUrl(typeUrlPrefix?: string): string;
+                        }
+
+                        namespace DocumentLayoutBlock {
+
+                            /** Properties of a LayoutPageSpan. */
+                            interface ILayoutPageSpan {
+
+                                /** LayoutPageSpan pageStart */
+                                pageStart?: (number|null);
+
+                                /** LayoutPageSpan pageEnd */
+                                pageEnd?: (number|null);
+                            }
+
+                            /** Represents a LayoutPageSpan. */
+                            class LayoutPageSpan implements ILayoutPageSpan {
+
+                                /**
+                                 * Constructs a new LayoutPageSpan.
+                                 * @param [properties] Properties to set
+                                 */
+                                constructor(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan);
+
+                                /** LayoutPageSpan pageStart. */
+                                public pageStart: number;
+
+                                /** LayoutPageSpan pageEnd. */
+                                public pageEnd: number;
+
+                                /**
+                                 * Creates a new LayoutPageSpan instance using the specified properties.
+                                 * @param [properties] Properties to set
+                                 * @returns LayoutPageSpan instance
+                                 */
+                                public static create(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan;
+
+                                /**
+                                 * Encodes the specified LayoutPageSpan message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan.verify|verify} messages.
+                                 * @param message LayoutPageSpan message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encode(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Encodes the specified LayoutPageSpan message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan.verify|verify} messages.
+                                 * @param message LayoutPageSpan message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encodeDelimited(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Decodes a LayoutPageSpan message from the specified reader or buffer.
+                                 * @param reader Reader or buffer to decode from
+                                 * @param [length] Message length if known beforehand
+                                 * @returns LayoutPageSpan
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan;
+
+                                /**
+                                 * Decodes a LayoutPageSpan message from the specified reader or buffer, length delimited.
+                                 * @param reader Reader or buffer to decode from
+                                 * @returns LayoutPageSpan
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan;
+
+                                /**
+                                 * Verifies a LayoutPageSpan message.
+                                 * @param message Plain object to verify
+                                 * @returns `null` if valid, otherwise the reason why it is not
+                                 */
+                                public static verify(message: { [k: string]: any }): (string|null);
+
+                                /**
+                                 * Creates a LayoutPageSpan message from a plain object. Also converts values to their respective internal types.
+                                 * @param object Plain object
+                                 * @returns LayoutPageSpan
+                                 */
+                                public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan;
+
+                                /**
+                                 * Creates a plain object from a LayoutPageSpan message. Also converts values to other types if specified.
+                                 * @param message LayoutPageSpan
+                                 * @param [options] Conversion options
+                                 * @returns Plain object
+                                 */
+                                public static toObject(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                                /**
+                                 * Converts this LayoutPageSpan to JSON.
+                                 * @returns JSON object
+                                 */
+                                public toJSON(): { [k: string]: any };
+
+                                /**
+                                 * Gets the default type url for LayoutPageSpan
+                                 * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns The default type url
+                                 */
+                                public static getTypeUrl(typeUrlPrefix?: string): string;
+                            }
+
+                            /** Properties of a LayoutTextBlock. */
+                            interface ILayoutTextBlock {
+
+                                /** LayoutTextBlock text */
+                                text?: (string|null);
+
+                                /** LayoutTextBlock type */
+                                type?: (string|null);
+
+                                /** LayoutTextBlock blocks */
+                                blocks?: (google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock[]|null);
+                            }
+
+                            /** Represents a LayoutTextBlock. */
+                            class LayoutTextBlock implements ILayoutTextBlock {
+
+                                /**
+                                 * Constructs a new LayoutTextBlock.
+                                 * @param [properties] Properties to set
+                                 */
+                                constructor(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock);
+
+                                /** LayoutTextBlock text. */
+                                public text: string;
+
+                                /** LayoutTextBlock type. */
+                                public type: string;
+
+                                /** LayoutTextBlock blocks. */
+                                public blocks: google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock[];
+
+                                /**
+                                 * Creates a new LayoutTextBlock instance using the specified properties.
+                                 * @param [properties] Properties to set
+                                 * @returns LayoutTextBlock instance
+                                 */
+                                public static create(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock;
+
+                                /**
+                                 * Encodes the specified LayoutTextBlock message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock.verify|verify} messages.
+                                 * @param message LayoutTextBlock message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encode(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Encodes the specified LayoutTextBlock message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock.verify|verify} messages.
+                                 * @param message LayoutTextBlock message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encodeDelimited(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Decodes a LayoutTextBlock message from the specified reader or buffer.
+                                 * @param reader Reader or buffer to decode from
+                                 * @param [length] Message length if known beforehand
+                                 * @returns LayoutTextBlock
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock;
+
+                                /**
+                                 * Decodes a LayoutTextBlock message from the specified reader or buffer, length delimited.
+                                 * @param reader Reader or buffer to decode from
+                                 * @returns LayoutTextBlock
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock;
+
+                                /**
+                                 * Verifies a LayoutTextBlock message.
+                                 * @param message Plain object to verify
+                                 * @returns `null` if valid, otherwise the reason why it is not
+                                 */
+                                public static verify(message: { [k: string]: any }): (string|null);
+
+                                /**
+                                 * Creates a LayoutTextBlock message from a plain object. Also converts values to their respective internal types.
+                                 * @param object Plain object
+                                 * @returns LayoutTextBlock
+                                 */
+                                public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock;
+
+                                /**
+                                 * Creates a plain object from a LayoutTextBlock message. Also converts values to other types if specified.
+                                 * @param message LayoutTextBlock
+                                 * @param [options] Conversion options
+                                 * @returns Plain object
+                                 */
+                                public static toObject(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                                /**
+                                 * Converts this LayoutTextBlock to JSON.
+                                 * @returns JSON object
+                                 */
+                                public toJSON(): { [k: string]: any };
+
+                                /**
+                                 * Gets the default type url for LayoutTextBlock
+                                 * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns The default type url
+                                 */
+                                public static getTypeUrl(typeUrlPrefix?: string): string;
+                            }
+
+                            /** Properties of a LayoutTableBlock. */
+                            interface ILayoutTableBlock {
+
+                                /** LayoutTableBlock headerRows */
+                                headerRows?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow[]|null);
+
+                                /** LayoutTableBlock bodyRows */
+                                bodyRows?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow[]|null);
+
+                                /** LayoutTableBlock caption */
+                                caption?: (string|null);
+                            }
+
+                            /** Represents a LayoutTableBlock. */
+                            class LayoutTableBlock implements ILayoutTableBlock {
+
+                                /**
+                                 * Constructs a new LayoutTableBlock.
+                                 * @param [properties] Properties to set
+                                 */
+                                constructor(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock);
+
+                                /** LayoutTableBlock headerRows. */
+                                public headerRows: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow[];
+
+                                /** LayoutTableBlock bodyRows. */
+                                public bodyRows: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow[];
+
+                                /** LayoutTableBlock caption. */
+                                public caption: string;
+
+                                /**
+                                 * Creates a new LayoutTableBlock instance using the specified properties.
+                                 * @param [properties] Properties to set
+                                 * @returns LayoutTableBlock instance
+                                 */
+                                public static create(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock;
+
+                                /**
+                                 * Encodes the specified LayoutTableBlock message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.verify|verify} messages.
+                                 * @param message LayoutTableBlock message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encode(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Encodes the specified LayoutTableBlock message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.verify|verify} messages.
+                                 * @param message LayoutTableBlock message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encodeDelimited(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Decodes a LayoutTableBlock message from the specified reader or buffer.
+                                 * @param reader Reader or buffer to decode from
+                                 * @param [length] Message length if known beforehand
+                                 * @returns LayoutTableBlock
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock;
+
+                                /**
+                                 * Decodes a LayoutTableBlock message from the specified reader or buffer, length delimited.
+                                 * @param reader Reader or buffer to decode from
+                                 * @returns LayoutTableBlock
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock;
+
+                                /**
+                                 * Verifies a LayoutTableBlock message.
+                                 * @param message Plain object to verify
+                                 * @returns `null` if valid, otherwise the reason why it is not
+                                 */
+                                public static verify(message: { [k: string]: any }): (string|null);
+
+                                /**
+                                 * Creates a LayoutTableBlock message from a plain object. Also converts values to their respective internal types.
+                                 * @param object Plain object
+                                 * @returns LayoutTableBlock
+                                 */
+                                public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock;
+
+                                /**
+                                 * Creates a plain object from a LayoutTableBlock message. Also converts values to other types if specified.
+                                 * @param message LayoutTableBlock
+                                 * @param [options] Conversion options
+                                 * @returns Plain object
+                                 */
+                                public static toObject(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                                /**
+                                 * Converts this LayoutTableBlock to JSON.
+                                 * @returns JSON object
+                                 */
+                                public toJSON(): { [k: string]: any };
+
+                                /**
+                                 * Gets the default type url for LayoutTableBlock
+                                 * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns The default type url
+                                 */
+                                public static getTypeUrl(typeUrlPrefix?: string): string;
+                            }
+
+                            /** Properties of a LayoutTableRow. */
+                            interface ILayoutTableRow {
+
+                                /** LayoutTableRow cells */
+                                cells?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell[]|null);
+                            }
+
+                            /** Represents a LayoutTableRow. */
+                            class LayoutTableRow implements ILayoutTableRow {
+
+                                /**
+                                 * Constructs a new LayoutTableRow.
+                                 * @param [properties] Properties to set
+                                 */
+                                constructor(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow);
+
+                                /** LayoutTableRow cells. */
+                                public cells: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell[];
+
+                                /**
+                                 * Creates a new LayoutTableRow instance using the specified properties.
+                                 * @param [properties] Properties to set
+                                 * @returns LayoutTableRow instance
+                                 */
+                                public static create(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow;
+
+                                /**
+                                 * Encodes the specified LayoutTableRow message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.verify|verify} messages.
+                                 * @param message LayoutTableRow message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encode(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Encodes the specified LayoutTableRow message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.verify|verify} messages.
+                                 * @param message LayoutTableRow message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encodeDelimited(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Decodes a LayoutTableRow message from the specified reader or buffer.
+                                 * @param reader Reader or buffer to decode from
+                                 * @param [length] Message length if known beforehand
+                                 * @returns LayoutTableRow
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow;
+
+                                /**
+                                 * Decodes a LayoutTableRow message from the specified reader or buffer, length delimited.
+                                 * @param reader Reader or buffer to decode from
+                                 * @returns LayoutTableRow
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow;
+
+                                /**
+                                 * Verifies a LayoutTableRow message.
+                                 * @param message Plain object to verify
+                                 * @returns `null` if valid, otherwise the reason why it is not
+                                 */
+                                public static verify(message: { [k: string]: any }): (string|null);
+
+                                /**
+                                 * Creates a LayoutTableRow message from a plain object. Also converts values to their respective internal types.
+                                 * @param object Plain object
+                                 * @returns LayoutTableRow
+                                 */
+                                public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow;
+
+                                /**
+                                 * Creates a plain object from a LayoutTableRow message. Also converts values to other types if specified.
+                                 * @param message LayoutTableRow
+                                 * @param [options] Conversion options
+                                 * @returns Plain object
+                                 */
+                                public static toObject(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                                /**
+                                 * Converts this LayoutTableRow to JSON.
+                                 * @returns JSON object
+                                 */
+                                public toJSON(): { [k: string]: any };
+
+                                /**
+                                 * Gets the default type url for LayoutTableRow
+                                 * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns The default type url
+                                 */
+                                public static getTypeUrl(typeUrlPrefix?: string): string;
+                            }
+
+                            /** Properties of a LayoutTableCell. */
+                            interface ILayoutTableCell {
+
+                                /** LayoutTableCell blocks */
+                                blocks?: (google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock[]|null);
+
+                                /** LayoutTableCell rowSpan */
+                                rowSpan?: (number|null);
+
+                                /** LayoutTableCell colSpan */
+                                colSpan?: (number|null);
+                            }
+
+                            /** Represents a LayoutTableCell. */
+                            class LayoutTableCell implements ILayoutTableCell {
+
+                                /**
+                                 * Constructs a new LayoutTableCell.
+                                 * @param [properties] Properties to set
+                                 */
+                                constructor(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell);
+
+                                /** LayoutTableCell blocks. */
+                                public blocks: google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock[];
+
+                                /** LayoutTableCell rowSpan. */
+                                public rowSpan: number;
+
+                                /** LayoutTableCell colSpan. */
+                                public colSpan: number;
+
+                                /**
+                                 * Creates a new LayoutTableCell instance using the specified properties.
+                                 * @param [properties] Properties to set
+                                 * @returns LayoutTableCell instance
+                                 */
+                                public static create(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell;
+
+                                /**
+                                 * Encodes the specified LayoutTableCell message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell.verify|verify} messages.
+                                 * @param message LayoutTableCell message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encode(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Encodes the specified LayoutTableCell message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell.verify|verify} messages.
+                                 * @param message LayoutTableCell message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encodeDelimited(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Decodes a LayoutTableCell message from the specified reader or buffer.
+                                 * @param reader Reader or buffer to decode from
+                                 * @param [length] Message length if known beforehand
+                                 * @returns LayoutTableCell
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell;
+
+                                /**
+                                 * Decodes a LayoutTableCell message from the specified reader or buffer, length delimited.
+                                 * @param reader Reader or buffer to decode from
+                                 * @returns LayoutTableCell
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell;
+
+                                /**
+                                 * Verifies a LayoutTableCell message.
+                                 * @param message Plain object to verify
+                                 * @returns `null` if valid, otherwise the reason why it is not
+                                 */
+                                public static verify(message: { [k: string]: any }): (string|null);
+
+                                /**
+                                 * Creates a LayoutTableCell message from a plain object. Also converts values to their respective internal types.
+                                 * @param object Plain object
+                                 * @returns LayoutTableCell
+                                 */
+                                public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell;
+
+                                /**
+                                 * Creates a plain object from a LayoutTableCell message. Also converts values to other types if specified.
+                                 * @param message LayoutTableCell
+                                 * @param [options] Conversion options
+                                 * @returns Plain object
+                                 */
+                                public static toObject(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                                /**
+                                 * Converts this LayoutTableCell to JSON.
+                                 * @returns JSON object
+                                 */
+                                public toJSON(): { [k: string]: any };
+
+                                /**
+                                 * Gets the default type url for LayoutTableCell
+                                 * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns The default type url
+                                 */
+                                public static getTypeUrl(typeUrlPrefix?: string): string;
+                            }
+
+                            /** Properties of a LayoutListBlock. */
+                            interface ILayoutListBlock {
+
+                                /** LayoutListBlock listEntries */
+                                listEntries?: (google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry[]|null);
+
+                                /** LayoutListBlock type */
+                                type?: (string|null);
+                            }
+
+                            /** Represents a LayoutListBlock. */
+                            class LayoutListBlock implements ILayoutListBlock {
+
+                                /**
+                                 * Constructs a new LayoutListBlock.
+                                 * @param [properties] Properties to set
+                                 */
+                                constructor(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock);
+
+                                /** LayoutListBlock listEntries. */
+                                public listEntries: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry[];
+
+                                /** LayoutListBlock type. */
+                                public type: string;
+
+                                /**
+                                 * Creates a new LayoutListBlock instance using the specified properties.
+                                 * @param [properties] Properties to set
+                                 * @returns LayoutListBlock instance
+                                 */
+                                public static create(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock;
+
+                                /**
+                                 * Encodes the specified LayoutListBlock message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock.verify|verify} messages.
+                                 * @param message LayoutListBlock message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encode(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Encodes the specified LayoutListBlock message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock.verify|verify} messages.
+                                 * @param message LayoutListBlock message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encodeDelimited(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Decodes a LayoutListBlock message from the specified reader or buffer.
+                                 * @param reader Reader or buffer to decode from
+                                 * @param [length] Message length if known beforehand
+                                 * @returns LayoutListBlock
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock;
+
+                                /**
+                                 * Decodes a LayoutListBlock message from the specified reader or buffer, length delimited.
+                                 * @param reader Reader or buffer to decode from
+                                 * @returns LayoutListBlock
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock;
+
+                                /**
+                                 * Verifies a LayoutListBlock message.
+                                 * @param message Plain object to verify
+                                 * @returns `null` if valid, otherwise the reason why it is not
+                                 */
+                                public static verify(message: { [k: string]: any }): (string|null);
+
+                                /**
+                                 * Creates a LayoutListBlock message from a plain object. Also converts values to their respective internal types.
+                                 * @param object Plain object
+                                 * @returns LayoutListBlock
+                                 */
+                                public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock;
+
+                                /**
+                                 * Creates a plain object from a LayoutListBlock message. Also converts values to other types if specified.
+                                 * @param message LayoutListBlock
+                                 * @param [options] Conversion options
+                                 * @returns Plain object
+                                 */
+                                public static toObject(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                                /**
+                                 * Converts this LayoutListBlock to JSON.
+                                 * @returns JSON object
+                                 */
+                                public toJSON(): { [k: string]: any };
+
+                                /**
+                                 * Gets the default type url for LayoutListBlock
+                                 * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns The default type url
+                                 */
+                                public static getTypeUrl(typeUrlPrefix?: string): string;
+                            }
+
+                            /** Properties of a LayoutListEntry. */
+                            interface ILayoutListEntry {
+
+                                /** LayoutListEntry blocks */
+                                blocks?: (google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock[]|null);
+                            }
+
+                            /** Represents a LayoutListEntry. */
+                            class LayoutListEntry implements ILayoutListEntry {
+
+                                /**
+                                 * Constructs a new LayoutListEntry.
+                                 * @param [properties] Properties to set
+                                 */
+                                constructor(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry);
+
+                                /** LayoutListEntry blocks. */
+                                public blocks: google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock[];
+
+                                /**
+                                 * Creates a new LayoutListEntry instance using the specified properties.
+                                 * @param [properties] Properties to set
+                                 * @returns LayoutListEntry instance
+                                 */
+                                public static create(properties?: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry;
+
+                                /**
+                                 * Encodes the specified LayoutListEntry message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry.verify|verify} messages.
+                                 * @param message LayoutListEntry message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encode(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Encodes the specified LayoutListEntry message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry.verify|verify} messages.
+                                 * @param message LayoutListEntry message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encodeDelimited(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Decodes a LayoutListEntry message from the specified reader or buffer.
+                                 * @param reader Reader or buffer to decode from
+                                 * @param [length] Message length if known beforehand
+                                 * @returns LayoutListEntry
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry;
+
+                                /**
+                                 * Decodes a LayoutListEntry message from the specified reader or buffer, length delimited.
+                                 * @param reader Reader or buffer to decode from
+                                 * @returns LayoutListEntry
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry;
+
+                                /**
+                                 * Verifies a LayoutListEntry message.
+                                 * @param message Plain object to verify
+                                 * @returns `null` if valid, otherwise the reason why it is not
+                                 */
+                                public static verify(message: { [k: string]: any }): (string|null);
+
+                                /**
+                                 * Creates a LayoutListEntry message from a plain object. Also converts values to their respective internal types.
+                                 * @param object Plain object
+                                 * @returns LayoutListEntry
+                                 */
+                                public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry;
+
+                                /**
+                                 * Creates a plain object from a LayoutListEntry message. Also converts values to other types if specified.
+                                 * @param message LayoutListEntry
+                                 * @param [options] Conversion options
+                                 * @returns Plain object
+                                 */
+                                public static toObject(message: google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                                /**
+                                 * Converts this LayoutListEntry to JSON.
+                                 * @returns JSON object
+                                 */
+                                public toJSON(): { [k: string]: any };
+
+                                /**
+                                 * Gets the default type url for LayoutListEntry
+                                 * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns The default type url
+                                 */
+                                public static getTypeUrl(typeUrlPrefix?: string): string;
+                            }
+                        }
+                    }
+
+                    /** Properties of a ChunkedDocument. */
+                    interface IChunkedDocument {
+
+                        /** ChunkedDocument chunks */
+                        chunks?: (google.cloud.documentai.v1.Document.ChunkedDocument.IChunk[]|null);
+                    }
+
+                    /** Represents a ChunkedDocument. */
+                    class ChunkedDocument implements IChunkedDocument {
+
+                        /**
+                         * Constructs a new ChunkedDocument.
+                         * @param [properties] Properties to set
+                         */
+                        constructor(properties?: google.cloud.documentai.v1.Document.IChunkedDocument);
+
+                        /** ChunkedDocument chunks. */
+                        public chunks: google.cloud.documentai.v1.Document.ChunkedDocument.IChunk[];
+
+                        /**
+                         * Creates a new ChunkedDocument instance using the specified properties.
+                         * @param [properties] Properties to set
+                         * @returns ChunkedDocument instance
+                         */
+                        public static create(properties?: google.cloud.documentai.v1.Document.IChunkedDocument): google.cloud.documentai.v1.Document.ChunkedDocument;
+
+                        /**
+                         * Encodes the specified ChunkedDocument message. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.verify|verify} messages.
+                         * @param message ChunkedDocument message or plain object to encode
+                         * @param [writer] Writer to encode to
+                         * @returns Writer
+                         */
+                        public static encode(message: google.cloud.documentai.v1.Document.IChunkedDocument, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                        /**
+                         * Encodes the specified ChunkedDocument message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.verify|verify} messages.
+                         * @param message ChunkedDocument message or plain object to encode
+                         * @param [writer] Writer to encode to
+                         * @returns Writer
+                         */
+                        public static encodeDelimited(message: google.cloud.documentai.v1.Document.IChunkedDocument, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                        /**
+                         * Decodes a ChunkedDocument message from the specified reader or buffer.
+                         * @param reader Reader or buffer to decode from
+                         * @param [length] Message length if known beforehand
+                         * @returns ChunkedDocument
+                         * @throws {Error} If the payload is not a reader or valid buffer
+                         * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                         */
+                        public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.ChunkedDocument;
+
+                        /**
+                         * Decodes a ChunkedDocument message from the specified reader or buffer, length delimited.
+                         * @param reader Reader or buffer to decode from
+                         * @returns ChunkedDocument
+                         * @throws {Error} If the payload is not a reader or valid buffer
+                         * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                         */
+                        public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.ChunkedDocument;
+
+                        /**
+                         * Verifies a ChunkedDocument message.
+                         * @param message Plain object to verify
+                         * @returns `null` if valid, otherwise the reason why it is not
+                         */
+                        public static verify(message: { [k: string]: any }): (string|null);
+
+                        /**
+                         * Creates a ChunkedDocument message from a plain object. Also converts values to their respective internal types.
+                         * @param object Plain object
+                         * @returns ChunkedDocument
+                         */
+                        public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.ChunkedDocument;
+
+                        /**
+                         * Creates a plain object from a ChunkedDocument message. Also converts values to other types if specified.
+                         * @param message ChunkedDocument
+                         * @param [options] Conversion options
+                         * @returns Plain object
+                         */
+                        public static toObject(message: google.cloud.documentai.v1.Document.ChunkedDocument, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                        /**
+                         * Converts this ChunkedDocument to JSON.
+                         * @returns JSON object
+                         */
+                        public toJSON(): { [k: string]: any };
+
+                        /**
+                         * Gets the default type url for ChunkedDocument
+                         * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                         * @returns The default type url
+                         */
+                        public static getTypeUrl(typeUrlPrefix?: string): string;
+                    }
+
+                    namespace ChunkedDocument {
+
+                        /** Properties of a Chunk. */
+                        interface IChunk {
+
+                            /** Chunk chunkId */
+                            chunkId?: (string|null);
+
+                            /** Chunk sourceBlockIds */
+                            sourceBlockIds?: (string[]|null);
+
+                            /** Chunk content */
+                            content?: (string|null);
+
+                            /** Chunk pageSpan */
+                            pageSpan?: (google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null);
+
+                            /** Chunk pageHeaders */
+                            pageHeaders?: (google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader[]|null);
+
+                            /** Chunk pageFooters */
+                            pageFooters?: (google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter[]|null);
+                        }
+
+                        /** Represents a Chunk. */
+                        class Chunk implements IChunk {
+
+                            /**
+                             * Constructs a new Chunk.
+                             * @param [properties] Properties to set
+                             */
+                            constructor(properties?: google.cloud.documentai.v1.Document.ChunkedDocument.IChunk);
+
+                            /** Chunk chunkId. */
+                            public chunkId: string;
+
+                            /** Chunk sourceBlockIds. */
+                            public sourceBlockIds: string[];
+
+                            /** Chunk content. */
+                            public content: string;
+
+                            /** Chunk pageSpan. */
+                            public pageSpan?: (google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null);
+
+                            /** Chunk pageHeaders. */
+                            public pageHeaders: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader[];
+
+                            /** Chunk pageFooters. */
+                            public pageFooters: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter[];
+
+                            /**
+                             * Creates a new Chunk instance using the specified properties.
+                             * @param [properties] Properties to set
+                             * @returns Chunk instance
+                             */
+                            public static create(properties?: google.cloud.documentai.v1.Document.ChunkedDocument.IChunk): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk;
+
+                            /**
+                             * Encodes the specified Chunk message. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.verify|verify} messages.
+                             * @param message Chunk message or plain object to encode
+                             * @param [writer] Writer to encode to
+                             * @returns Writer
+                             */
+                            public static encode(message: google.cloud.documentai.v1.Document.ChunkedDocument.IChunk, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                            /**
+                             * Encodes the specified Chunk message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.verify|verify} messages.
+                             * @param message Chunk message or plain object to encode
+                             * @param [writer] Writer to encode to
+                             * @returns Writer
+                             */
+                            public static encodeDelimited(message: google.cloud.documentai.v1.Document.ChunkedDocument.IChunk, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                            /**
+                             * Decodes a Chunk message from the specified reader or buffer.
+                             * @param reader Reader or buffer to decode from
+                             * @param [length] Message length if known beforehand
+                             * @returns Chunk
+                             * @throws {Error} If the payload is not a reader or valid buffer
+                             * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                             */
+                            public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk;
+
+                            /**
+                             * Decodes a Chunk message from the specified reader or buffer, length delimited.
+                             * @param reader Reader or buffer to decode from
+                             * @returns Chunk
+                             * @throws {Error} If the payload is not a reader or valid buffer
+                             * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                             */
+                            public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk;
+
+                            /**
+                             * Verifies a Chunk message.
+                             * @param message Plain object to verify
+                             * @returns `null` if valid, otherwise the reason why it is not
+                             */
+                            public static verify(message: { [k: string]: any }): (string|null);
+
+                            /**
+                             * Creates a Chunk message from a plain object. Also converts values to their respective internal types.
+                             * @param object Plain object
+                             * @returns Chunk
+                             */
+                            public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk;
+
+                            /**
+                             * Creates a plain object from a Chunk message. Also converts values to other types if specified.
+                             * @param message Chunk
+                             * @param [options] Conversion options
+                             * @returns Plain object
+                             */
+                            public static toObject(message: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                            /**
+                             * Converts this Chunk to JSON.
+                             * @returns JSON object
+                             */
+                            public toJSON(): { [k: string]: any };
+
+                            /**
+                             * Gets the default type url for Chunk
+                             * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                             * @returns The default type url
+                             */
+                            public static getTypeUrl(typeUrlPrefix?: string): string;
+                        }
+
+                        namespace Chunk {
+
+                            /** Properties of a ChunkPageSpan. */
+                            interface IChunkPageSpan {
+
+                                /** ChunkPageSpan pageStart */
+                                pageStart?: (number|null);
+
+                                /** ChunkPageSpan pageEnd */
+                                pageEnd?: (number|null);
+                            }
+
+                            /** Represents a ChunkPageSpan. */
+                            class ChunkPageSpan implements IChunkPageSpan {
+
+                                /**
+                                 * Constructs a new ChunkPageSpan.
+                                 * @param [properties] Properties to set
+                                 */
+                                constructor(properties?: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan);
+
+                                /** ChunkPageSpan pageStart. */
+                                public pageStart: number;
+
+                                /** ChunkPageSpan pageEnd. */
+                                public pageEnd: number;
+
+                                /**
+                                 * Creates a new ChunkPageSpan instance using the specified properties.
+                                 * @param [properties] Properties to set
+                                 * @returns ChunkPageSpan instance
+                                 */
+                                public static create(properties?: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan;
+
+                                /**
+                                 * Encodes the specified ChunkPageSpan message. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.verify|verify} messages.
+                                 * @param message ChunkPageSpan message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encode(message: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Encodes the specified ChunkPageSpan message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.verify|verify} messages.
+                                 * @param message ChunkPageSpan message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encodeDelimited(message: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Decodes a ChunkPageSpan message from the specified reader or buffer.
+                                 * @param reader Reader or buffer to decode from
+                                 * @param [length] Message length if known beforehand
+                                 * @returns ChunkPageSpan
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan;
+
+                                /**
+                                 * Decodes a ChunkPageSpan message from the specified reader or buffer, length delimited.
+                                 * @param reader Reader or buffer to decode from
+                                 * @returns ChunkPageSpan
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan;
+
+                                /**
+                                 * Verifies a ChunkPageSpan message.
+                                 * @param message Plain object to verify
+                                 * @returns `null` if valid, otherwise the reason why it is not
+                                 */
+                                public static verify(message: { [k: string]: any }): (string|null);
+
+                                /**
+                                 * Creates a ChunkPageSpan message from a plain object. Also converts values to their respective internal types.
+                                 * @param object Plain object
+                                 * @returns ChunkPageSpan
+                                 */
+                                public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan;
+
+                                /**
+                                 * Creates a plain object from a ChunkPageSpan message. Also converts values to other types if specified.
+                                 * @param message ChunkPageSpan
+                                 * @param [options] Conversion options
+                                 * @returns Plain object
+                                 */
+                                public static toObject(message: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                                /**
+                                 * Converts this ChunkPageSpan to JSON.
+                                 * @returns JSON object
+                                 */
+                                public toJSON(): { [k: string]: any };
+
+                                /**
+                                 * Gets the default type url for ChunkPageSpan
+                                 * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns The default type url
+                                 */
+                                public static getTypeUrl(typeUrlPrefix?: string): string;
+                            }
+
+                            /** Properties of a ChunkPageHeader. */
+                            interface IChunkPageHeader {
+
+                                /** ChunkPageHeader text */
+                                text?: (string|null);
+
+                                /** ChunkPageHeader pageSpan */
+                                pageSpan?: (google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null);
+                            }
+
+                            /** Represents a ChunkPageHeader. */
+                            class ChunkPageHeader implements IChunkPageHeader {
+
+                                /**
+                                 * Constructs a new ChunkPageHeader.
+                                 * @param [properties] Properties to set
+                                 */
+                                constructor(properties?: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader);
+
+                                /** ChunkPageHeader text. */
+                                public text: string;
+
+                                /** ChunkPageHeader pageSpan. */
+                                public pageSpan?: (google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null);
+
+                                /**
+                                 * Creates a new ChunkPageHeader instance using the specified properties.
+                                 * @param [properties] Properties to set
+                                 * @returns ChunkPageHeader instance
+                                 */
+                                public static create(properties?: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader;
+
+                                /**
+                                 * Encodes the specified ChunkPageHeader message. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader.verify|verify} messages.
+                                 * @param message ChunkPageHeader message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encode(message: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Encodes the specified ChunkPageHeader message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader.verify|verify} messages.
+                                 * @param message ChunkPageHeader message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encodeDelimited(message: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Decodes a ChunkPageHeader message from the specified reader or buffer.
+                                 * @param reader Reader or buffer to decode from
+                                 * @param [length] Message length if known beforehand
+                                 * @returns ChunkPageHeader
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader;
+
+                                /**
+                                 * Decodes a ChunkPageHeader message from the specified reader or buffer, length delimited.
+                                 * @param reader Reader or buffer to decode from
+                                 * @returns ChunkPageHeader
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader;
+
+                                /**
+                                 * Verifies a ChunkPageHeader message.
+                                 * @param message Plain object to verify
+                                 * @returns `null` if valid, otherwise the reason why it is not
+                                 */
+                                public static verify(message: { [k: string]: any }): (string|null);
+
+                                /**
+                                 * Creates a ChunkPageHeader message from a plain object. Also converts values to their respective internal types.
+                                 * @param object Plain object
+                                 * @returns ChunkPageHeader
+                                 */
+                                public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader;
+
+                                /**
+                                 * Creates a plain object from a ChunkPageHeader message. Also converts values to other types if specified.
+                                 * @param message ChunkPageHeader
+                                 * @param [options] Conversion options
+                                 * @returns Plain object
+                                 */
+                                public static toObject(message: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                                /**
+                                 * Converts this ChunkPageHeader to JSON.
+                                 * @returns JSON object
+                                 */
+                                public toJSON(): { [k: string]: any };
+
+                                /**
+                                 * Gets the default type url for ChunkPageHeader
+                                 * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns The default type url
+                                 */
+                                public static getTypeUrl(typeUrlPrefix?: string): string;
+                            }
+
+                            /** Properties of a ChunkPageFooter. */
+                            interface IChunkPageFooter {
+
+                                /** ChunkPageFooter text */
+                                text?: (string|null);
+
+                                /** ChunkPageFooter pageSpan */
+                                pageSpan?: (google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null);
+                            }
+
+                            /** Represents a ChunkPageFooter. */
+                            class ChunkPageFooter implements IChunkPageFooter {
+
+                                /**
+                                 * Constructs a new ChunkPageFooter.
+                                 * @param [properties] Properties to set
+                                 */
+                                constructor(properties?: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter);
+
+                                /** ChunkPageFooter text. */
+                                public text: string;
+
+                                /** ChunkPageFooter pageSpan. */
+                                public pageSpan?: (google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null);
+
+                                /**
+                                 * Creates a new ChunkPageFooter instance using the specified properties.
+                                 * @param [properties] Properties to set
+                                 * @returns ChunkPageFooter instance
+                                 */
+                                public static create(properties?: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter;
+
+                                /**
+                                 * Encodes the specified ChunkPageFooter message. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter.verify|verify} messages.
+                                 * @param message ChunkPageFooter message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encode(message: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Encodes the specified ChunkPageFooter message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter.verify|verify} messages.
+                                 * @param message ChunkPageFooter message or plain object to encode
+                                 * @param [writer] Writer to encode to
+                                 * @returns Writer
+                                 */
+                                public static encodeDelimited(message: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter, writer?: $protobuf.Writer): $protobuf.Writer;
+
+                                /**
+                                 * Decodes a ChunkPageFooter message from the specified reader or buffer.
+                                 * @param reader Reader or buffer to decode from
+                                 * @param [length] Message length if known beforehand
+                                 * @returns ChunkPageFooter
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decode(reader: ($protobuf.Reader|Uint8Array), length?: number): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter;
+
+                                /**
+                                 * Decodes a ChunkPageFooter message from the specified reader or buffer, length delimited.
+                                 * @param reader Reader or buffer to decode from
+                                 * @returns ChunkPageFooter
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                public static decodeDelimited(reader: ($protobuf.Reader|Uint8Array)): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter;
+
+                                /**
+                                 * Verifies a ChunkPageFooter message.
+                                 * @param message Plain object to verify
+                                 * @returns `null` if valid, otherwise the reason why it is not
+                                 */
+                                public static verify(message: { [k: string]: any }): (string|null);
+
+                                /**
+                                 * Creates a ChunkPageFooter message from a plain object. Also converts values to their respective internal types.
+                                 * @param object Plain object
+                                 * @returns ChunkPageFooter
+                                 */
+                                public static fromObject(object: { [k: string]: any }): google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter;
+
+                                /**
+                                 * Creates a plain object from a ChunkPageFooter message. Also converts values to other types if specified.
+                                 * @param message ChunkPageFooter
+                                 * @param [options] Conversion options
+                                 * @returns Plain object
+                                 */
+                                public static toObject(message: google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter, options?: $protobuf.IConversionOptions): { [k: string]: any };
+
+                                /**
+                                 * Converts this ChunkPageFooter to JSON.
+                                 * @returns JSON object
+                                 */
+                                public toJSON(): { [k: string]: any };
+
+                                /**
+                                 * Gets the default type url for ChunkPageFooter
+                                 * @param [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns The default type url
+                                 */
+                                public static getTypeUrl(typeUrlPrefix?: string): string;
+                            }
+                        }
+                    }
                 }
 
                 /** Properties of a Barcode. */
diff --git a/packages/google-cloud-contentwarehouse/protos/protos.js b/packages/google-cloud-contentwarehouse/protos/protos.js
index f5fda0638d4..2cdabb27bac 100644
--- a/packages/google-cloud-contentwarehouse/protos/protos.js
+++ b/packages/google-cloud-contentwarehouse/protos/protos.js
@@ -32363,6 +32363,8 @@
                          * @property {google.cloud.documentai.v1.Document.IShardInfo|null} [shardInfo] Document shardInfo
                          * @property {google.rpc.IStatus|null} [error] Document error
                          * @property {Array.<google.cloud.documentai.v1.Document.IRevision>|null} [revisions] Document revisions
+                         * @property {google.cloud.documentai.v1.Document.IDocumentLayout|null} [documentLayout] Document documentLayout
+                         * @property {google.cloud.documentai.v1.Document.IChunkedDocument|null} [chunkedDocument] Document chunkedDocument
                          */
     
                         /**
@@ -32482,6 +32484,22 @@
                          */
                         Document.prototype.revisions = $util.emptyArray;
     
+                        /**
+                         * Document documentLayout.
+                         * @member {google.cloud.documentai.v1.Document.IDocumentLayout|null|undefined} documentLayout
+                         * @memberof google.cloud.documentai.v1.Document
+                         * @instance
+                         */
+                        Document.prototype.documentLayout = null;
+    
+                        /**
+                         * Document chunkedDocument.
+                         * @member {google.cloud.documentai.v1.Document.IChunkedDocument|null|undefined} chunkedDocument
+                         * @memberof google.cloud.documentai.v1.Document
+                         * @instance
+                         */
+                        Document.prototype.chunkedDocument = null;
+    
                         // OneOf field names bound to virtual getters and setters
                         var $oneOfFields;
     
@@ -32550,6 +32568,10 @@
                             if (message.textChanges != null && message.textChanges.length)
                                 for (var i = 0; i < message.textChanges.length; ++i)
                                     $root.google.cloud.documentai.v1.Document.TextChange.encode(message.textChanges[i], writer.uint32(/* id 14, wireType 2 =*/114).fork()).ldelim();
+                            if (message.documentLayout != null && Object.hasOwnProperty.call(message, "documentLayout"))
+                                $root.google.cloud.documentai.v1.Document.DocumentLayout.encode(message.documentLayout, writer.uint32(/* id 17, wireType 2 =*/138).fork()).ldelim();
+                            if (message.chunkedDocument != null && Object.hasOwnProperty.call(message, "chunkedDocument"))
+                                $root.google.cloud.documentai.v1.Document.ChunkedDocument.encode(message.chunkedDocument, writer.uint32(/* id 18, wireType 2 =*/146).fork()).ldelim();
                             return writer;
                         };
     
@@ -32644,6 +32666,14 @@
                                         message.revisions.push($root.google.cloud.documentai.v1.Document.Revision.decode(reader, reader.uint32()));
                                         break;
                                     }
+                                case 17: {
+                                        message.documentLayout = $root.google.cloud.documentai.v1.Document.DocumentLayout.decode(reader, reader.uint32());
+                                        break;
+                                    }
+                                case 18: {
+                                        message.chunkedDocument = $root.google.cloud.documentai.v1.Document.ChunkedDocument.decode(reader, reader.uint32());
+                                        break;
+                                    }
                                 default:
                                     reader.skipType(tag & 7);
                                     break;
@@ -32762,6 +32792,16 @@
                                         return "revisions." + error;
                                 }
                             }
+                            if (message.documentLayout != null && message.hasOwnProperty("documentLayout")) {
+                                var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.verify(message.documentLayout);
+                                if (error)
+                                    return "documentLayout." + error;
+                            }
+                            if (message.chunkedDocument != null && message.hasOwnProperty("chunkedDocument")) {
+                                var error = $root.google.cloud.documentai.v1.Document.ChunkedDocument.verify(message.chunkedDocument);
+                                if (error)
+                                    return "chunkedDocument." + error;
+                            }
                             return null;
                         };
     
@@ -32858,6 +32898,16 @@
                                     message.revisions[i] = $root.google.cloud.documentai.v1.Document.Revision.fromObject(object.revisions[i]);
                                 }
                             }
+                            if (object.documentLayout != null) {
+                                if (typeof object.documentLayout !== "object")
+                                    throw TypeError(".google.cloud.documentai.v1.Document.documentLayout: object expected");
+                                message.documentLayout = $root.google.cloud.documentai.v1.Document.DocumentLayout.fromObject(object.documentLayout);
+                            }
+                            if (object.chunkedDocument != null) {
+                                if (typeof object.chunkedDocument !== "object")
+                                    throw TypeError(".google.cloud.documentai.v1.Document.chunkedDocument: object expected");
+                                message.chunkedDocument = $root.google.cloud.documentai.v1.Document.ChunkedDocument.fromObject(object.chunkedDocument);
+                            }
                             return message;
                         };
     
@@ -32887,6 +32937,8 @@
                                 object.text = "";
                                 object.shardInfo = null;
                                 object.error = null;
+                                object.documentLayout = null;
+                                object.chunkedDocument = null;
                             }
                             if (message.uri != null && message.hasOwnProperty("uri")) {
                                 object.uri = message.uri;
@@ -32936,6 +32988,10 @@
                                 for (var j = 0; j < message.textChanges.length; ++j)
                                     object.textChanges[j] = $root.google.cloud.documentai.v1.Document.TextChange.toObject(message.textChanges[j], options);
                             }
+                            if (message.documentLayout != null && message.hasOwnProperty("documentLayout"))
+                                object.documentLayout = $root.google.cloud.documentai.v1.Document.DocumentLayout.toObject(message.documentLayout, options);
+                            if (message.chunkedDocument != null && message.hasOwnProperty("chunkedDocument"))
+                                object.chunkedDocument = $root.google.cloud.documentai.v1.Document.ChunkedDocument.toObject(message.chunkedDocument, options);
                             return object;
                         };
     
@@ -44437,6 +44493,3639 @@
                             return TextChange;
                         })();
     
+                        Document.DocumentLayout = (function() {
+    
+                            /**
+                             * Properties of a DocumentLayout.
+                             * @memberof google.cloud.documentai.v1.Document
+                             * @interface IDocumentLayout
+                             * @property {Array.<google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock>|null} [blocks] DocumentLayout blocks
+                             */
+    
+                            /**
+                             * Constructs a new DocumentLayout.
+                             * @memberof google.cloud.documentai.v1.Document
+                             * @classdesc Represents a DocumentLayout.
+                             * @implements IDocumentLayout
+                             * @constructor
+                             * @param {google.cloud.documentai.v1.Document.IDocumentLayout=} [properties] Properties to set
+                             */
+                            function DocumentLayout(properties) {
+                                this.blocks = [];
+                                if (properties)
+                                    for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                        if (properties[keys[i]] != null)
+                                            this[keys[i]] = properties[keys[i]];
+                            }
+    
+                            /**
+                             * DocumentLayout blocks.
+                             * @member {Array.<google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock>} blocks
+                             * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                             * @instance
+                             */
+                            DocumentLayout.prototype.blocks = $util.emptyArray;
+    
+                            /**
+                             * Creates a new DocumentLayout instance using the specified properties.
+                             * @function create
+                             * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                             * @static
+                             * @param {google.cloud.documentai.v1.Document.IDocumentLayout=} [properties] Properties to set
+                             * @returns {google.cloud.documentai.v1.Document.DocumentLayout} DocumentLayout instance
+                             */
+                            DocumentLayout.create = function create(properties) {
+                                return new DocumentLayout(properties);
+                            };
+    
+                            /**
+                             * Encodes the specified DocumentLayout message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.verify|verify} messages.
+                             * @function encode
+                             * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                             * @static
+                             * @param {google.cloud.documentai.v1.Document.IDocumentLayout} message DocumentLayout message or plain object to encode
+                             * @param {$protobuf.Writer} [writer] Writer to encode to
+                             * @returns {$protobuf.Writer} Writer
+                             */
+                            DocumentLayout.encode = function encode(message, writer) {
+                                if (!writer)
+                                    writer = $Writer.create();
+                                if (message.blocks != null && message.blocks.length)
+                                    for (var i = 0; i < message.blocks.length; ++i)
+                                        $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.encode(message.blocks[i], writer.uint32(/* id 1, wireType 2 =*/10).fork()).ldelim();
+                                return writer;
+                            };
+    
+                            /**
+                             * Encodes the specified DocumentLayout message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.verify|verify} messages.
+                             * @function encodeDelimited
+                             * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                             * @static
+                             * @param {google.cloud.documentai.v1.Document.IDocumentLayout} message DocumentLayout message or plain object to encode
+                             * @param {$protobuf.Writer} [writer] Writer to encode to
+                             * @returns {$protobuf.Writer} Writer
+                             */
+                            DocumentLayout.encodeDelimited = function encodeDelimited(message, writer) {
+                                return this.encode(message, writer).ldelim();
+                            };
+    
+                            /**
+                             * Decodes a DocumentLayout message from the specified reader or buffer.
+                             * @function decode
+                             * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                             * @static
+                             * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                             * @param {number} [length] Message length if known beforehand
+                             * @returns {google.cloud.documentai.v1.Document.DocumentLayout} DocumentLayout
+                             * @throws {Error} If the payload is not a reader or valid buffer
+                             * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                             */
+                            DocumentLayout.decode = function decode(reader, length) {
+                                if (!(reader instanceof $Reader))
+                                    reader = $Reader.create(reader);
+                                var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.DocumentLayout();
+                                while (reader.pos < end) {
+                                    var tag = reader.uint32();
+                                    switch (tag >>> 3) {
+                                    case 1: {
+                                            if (!(message.blocks && message.blocks.length))
+                                                message.blocks = [];
+                                            message.blocks.push($root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.decode(reader, reader.uint32()));
+                                            break;
+                                        }
+                                    default:
+                                        reader.skipType(tag & 7);
+                                        break;
+                                    }
+                                }
+                                return message;
+                            };
+    
+                            /**
+                             * Decodes a DocumentLayout message from the specified reader or buffer, length delimited.
+                             * @function decodeDelimited
+                             * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                             * @static
+                             * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                             * @returns {google.cloud.documentai.v1.Document.DocumentLayout} DocumentLayout
+                             * @throws {Error} If the payload is not a reader or valid buffer
+                             * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                             */
+                            DocumentLayout.decodeDelimited = function decodeDelimited(reader) {
+                                if (!(reader instanceof $Reader))
+                                    reader = new $Reader(reader);
+                                return this.decode(reader, reader.uint32());
+                            };
+    
+                            /**
+                             * Verifies a DocumentLayout message.
+                             * @function verify
+                             * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                             * @static
+                             * @param {Object.<string,*>} message Plain object to verify
+                             * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                             */
+                            DocumentLayout.verify = function verify(message) {
+                                if (typeof message !== "object" || message === null)
+                                    return "object expected";
+                                if (message.blocks != null && message.hasOwnProperty("blocks")) {
+                                    if (!Array.isArray(message.blocks))
+                                        return "blocks: array expected";
+                                    for (var i = 0; i < message.blocks.length; ++i) {
+                                        var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.verify(message.blocks[i]);
+                                        if (error)
+                                            return "blocks." + error;
+                                    }
+                                }
+                                return null;
+                            };
+    
+                            /**
+                             * Creates a DocumentLayout message from a plain object. Also converts values to their respective internal types.
+                             * @function fromObject
+                             * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                             * @static
+                             * @param {Object.<string,*>} object Plain object
+                             * @returns {google.cloud.documentai.v1.Document.DocumentLayout} DocumentLayout
+                             */
+                            DocumentLayout.fromObject = function fromObject(object) {
+                                if (object instanceof $root.google.cloud.documentai.v1.Document.DocumentLayout)
+                                    return object;
+                                var message = new $root.google.cloud.documentai.v1.Document.DocumentLayout();
+                                if (object.blocks) {
+                                    if (!Array.isArray(object.blocks))
+                                        throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.blocks: array expected");
+                                    message.blocks = [];
+                                    for (var i = 0; i < object.blocks.length; ++i) {
+                                        if (typeof object.blocks[i] !== "object")
+                                            throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.blocks: object expected");
+                                        message.blocks[i] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.fromObject(object.blocks[i]);
+                                    }
+                                }
+                                return message;
+                            };
+    
+                            /**
+                             * Creates a plain object from a DocumentLayout message. Also converts values to other types if specified.
+                             * @function toObject
+                             * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                             * @static
+                             * @param {google.cloud.documentai.v1.Document.DocumentLayout} message DocumentLayout
+                             * @param {$protobuf.IConversionOptions} [options] Conversion options
+                             * @returns {Object.<string,*>} Plain object
+                             */
+                            DocumentLayout.toObject = function toObject(message, options) {
+                                if (!options)
+                                    options = {};
+                                var object = {};
+                                if (options.arrays || options.defaults)
+                                    object.blocks = [];
+                                if (message.blocks && message.blocks.length) {
+                                    object.blocks = [];
+                                    for (var j = 0; j < message.blocks.length; ++j)
+                                        object.blocks[j] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.toObject(message.blocks[j], options);
+                                }
+                                return object;
+                            };
+    
+                            /**
+                             * Converts this DocumentLayout to JSON.
+                             * @function toJSON
+                             * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                             * @instance
+                             * @returns {Object.<string,*>} JSON object
+                             */
+                            DocumentLayout.prototype.toJSON = function toJSON() {
+                                return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                            };
+    
+                            /**
+                             * Gets the default type url for DocumentLayout
+                             * @function getTypeUrl
+                             * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                             * @static
+                             * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                             * @returns {string} The default type url
+                             */
+                            DocumentLayout.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                if (typeUrlPrefix === undefined) {
+                                    typeUrlPrefix = "type.googleapis.com";
+                                }
+                                return typeUrlPrefix + "/google.cloud.documentai.v1.Document.DocumentLayout";
+                            };
+    
+                            DocumentLayout.DocumentLayoutBlock = (function() {
+    
+                                /**
+                                 * Properties of a DocumentLayoutBlock.
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                                 * @interface IDocumentLayoutBlock
+                                 * @property {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock|null} [textBlock] DocumentLayoutBlock textBlock
+                                 * @property {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock|null} [tableBlock] DocumentLayoutBlock tableBlock
+                                 * @property {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock|null} [listBlock] DocumentLayoutBlock listBlock
+                                 * @property {string|null} [blockId] DocumentLayoutBlock blockId
+                                 * @property {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan|null} [pageSpan] DocumentLayoutBlock pageSpan
+                                 */
+    
+                                /**
+                                 * Constructs a new DocumentLayoutBlock.
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout
+                                 * @classdesc Represents a DocumentLayoutBlock.
+                                 * @implements IDocumentLayoutBlock
+                                 * @constructor
+                                 * @param {google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock=} [properties] Properties to set
+                                 */
+                                function DocumentLayoutBlock(properties) {
+                                    if (properties)
+                                        for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                            if (properties[keys[i]] != null)
+                                                this[keys[i]] = properties[keys[i]];
+                                }
+    
+                                /**
+                                 * DocumentLayoutBlock textBlock.
+                                 * @member {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock|null|undefined} textBlock
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @instance
+                                 */
+                                DocumentLayoutBlock.prototype.textBlock = null;
+    
+                                /**
+                                 * DocumentLayoutBlock tableBlock.
+                                 * @member {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock|null|undefined} tableBlock
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @instance
+                                 */
+                                DocumentLayoutBlock.prototype.tableBlock = null;
+    
+                                /**
+                                 * DocumentLayoutBlock listBlock.
+                                 * @member {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock|null|undefined} listBlock
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @instance
+                                 */
+                                DocumentLayoutBlock.prototype.listBlock = null;
+    
+                                /**
+                                 * DocumentLayoutBlock blockId.
+                                 * @member {string} blockId
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @instance
+                                 */
+                                DocumentLayoutBlock.prototype.blockId = "";
+    
+                                /**
+                                 * DocumentLayoutBlock pageSpan.
+                                 * @member {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan|null|undefined} pageSpan
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @instance
+                                 */
+                                DocumentLayoutBlock.prototype.pageSpan = null;
+    
+                                // OneOf field names bound to virtual getters and setters
+                                var $oneOfFields;
+    
+                                /**
+                                 * DocumentLayoutBlock block.
+                                 * @member {"textBlock"|"tableBlock"|"listBlock"|undefined} block
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @instance
+                                 */
+                                Object.defineProperty(DocumentLayoutBlock.prototype, "block", {
+                                    get: $util.oneOfGetter($oneOfFields = ["textBlock", "tableBlock", "listBlock"]),
+                                    set: $util.oneOfSetter($oneOfFields)
+                                });
+    
+                                /**
+                                 * Creates a new DocumentLayoutBlock instance using the specified properties.
+                                 * @function create
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @static
+                                 * @param {google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock=} [properties] Properties to set
+                                 * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock} DocumentLayoutBlock instance
+                                 */
+                                DocumentLayoutBlock.create = function create(properties) {
+                                    return new DocumentLayoutBlock(properties);
+                                };
+    
+                                /**
+                                 * Encodes the specified DocumentLayoutBlock message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.verify|verify} messages.
+                                 * @function encode
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @static
+                                 * @param {google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock} message DocumentLayoutBlock message or plain object to encode
+                                 * @param {$protobuf.Writer} [writer] Writer to encode to
+                                 * @returns {$protobuf.Writer} Writer
+                                 */
+                                DocumentLayoutBlock.encode = function encode(message, writer) {
+                                    if (!writer)
+                                        writer = $Writer.create();
+                                    if (message.blockId != null && Object.hasOwnProperty.call(message, "blockId"))
+                                        writer.uint32(/* id 1, wireType 2 =*/10).string(message.blockId);
+                                    if (message.textBlock != null && Object.hasOwnProperty.call(message, "textBlock"))
+                                        $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock.encode(message.textBlock, writer.uint32(/* id 2, wireType 2 =*/18).fork()).ldelim();
+                                    if (message.tableBlock != null && Object.hasOwnProperty.call(message, "tableBlock"))
+                                        $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.encode(message.tableBlock, writer.uint32(/* id 3, wireType 2 =*/26).fork()).ldelim();
+                                    if (message.listBlock != null && Object.hasOwnProperty.call(message, "listBlock"))
+                                        $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock.encode(message.listBlock, writer.uint32(/* id 4, wireType 2 =*/34).fork()).ldelim();
+                                    if (message.pageSpan != null && Object.hasOwnProperty.call(message, "pageSpan"))
+                                        $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan.encode(message.pageSpan, writer.uint32(/* id 5, wireType 2 =*/42).fork()).ldelim();
+                                    return writer;
+                                };
+    
+                                /**
+                                 * Encodes the specified DocumentLayoutBlock message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.verify|verify} messages.
+                                 * @function encodeDelimited
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @static
+                                 * @param {google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock} message DocumentLayoutBlock message or plain object to encode
+                                 * @param {$protobuf.Writer} [writer] Writer to encode to
+                                 * @returns {$protobuf.Writer} Writer
+                                 */
+                                DocumentLayoutBlock.encodeDelimited = function encodeDelimited(message, writer) {
+                                    return this.encode(message, writer).ldelim();
+                                };
+    
+                                /**
+                                 * Decodes a DocumentLayoutBlock message from the specified reader or buffer.
+                                 * @function decode
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @static
+                                 * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                 * @param {number} [length] Message length if known beforehand
+                                 * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock} DocumentLayoutBlock
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                DocumentLayoutBlock.decode = function decode(reader, length) {
+                                    if (!(reader instanceof $Reader))
+                                        reader = $Reader.create(reader);
+                                    var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock();
+                                    while (reader.pos < end) {
+                                        var tag = reader.uint32();
+                                        switch (tag >>> 3) {
+                                        case 2: {
+                                                message.textBlock = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock.decode(reader, reader.uint32());
+                                                break;
+                                            }
+                                        case 3: {
+                                                message.tableBlock = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.decode(reader, reader.uint32());
+                                                break;
+                                            }
+                                        case 4: {
+                                                message.listBlock = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock.decode(reader, reader.uint32());
+                                                break;
+                                            }
+                                        case 1: {
+                                                message.blockId = reader.string();
+                                                break;
+                                            }
+                                        case 5: {
+                                                message.pageSpan = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan.decode(reader, reader.uint32());
+                                                break;
+                                            }
+                                        default:
+                                            reader.skipType(tag & 7);
+                                            break;
+                                        }
+                                    }
+                                    return message;
+                                };
+    
+                                /**
+                                 * Decodes a DocumentLayoutBlock message from the specified reader or buffer, length delimited.
+                                 * @function decodeDelimited
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @static
+                                 * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                 * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock} DocumentLayoutBlock
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                DocumentLayoutBlock.decodeDelimited = function decodeDelimited(reader) {
+                                    if (!(reader instanceof $Reader))
+                                        reader = new $Reader(reader);
+                                    return this.decode(reader, reader.uint32());
+                                };
+    
+                                /**
+                                 * Verifies a DocumentLayoutBlock message.
+                                 * @function verify
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @static
+                                 * @param {Object.<string,*>} message Plain object to verify
+                                 * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                 */
+                                DocumentLayoutBlock.verify = function verify(message) {
+                                    if (typeof message !== "object" || message === null)
+                                        return "object expected";
+                                    var properties = {};
+                                    if (message.textBlock != null && message.hasOwnProperty("textBlock")) {
+                                        properties.block = 1;
+                                        {
+                                            var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock.verify(message.textBlock);
+                                            if (error)
+                                                return "textBlock." + error;
+                                        }
+                                    }
+                                    if (message.tableBlock != null && message.hasOwnProperty("tableBlock")) {
+                                        if (properties.block === 1)
+                                            return "block: multiple values";
+                                        properties.block = 1;
+                                        {
+                                            var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.verify(message.tableBlock);
+                                            if (error)
+                                                return "tableBlock." + error;
+                                        }
+                                    }
+                                    if (message.listBlock != null && message.hasOwnProperty("listBlock")) {
+                                        if (properties.block === 1)
+                                            return "block: multiple values";
+                                        properties.block = 1;
+                                        {
+                                            var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock.verify(message.listBlock);
+                                            if (error)
+                                                return "listBlock." + error;
+                                        }
+                                    }
+                                    if (message.blockId != null && message.hasOwnProperty("blockId"))
+                                        if (!$util.isString(message.blockId))
+                                            return "blockId: string expected";
+                                    if (message.pageSpan != null && message.hasOwnProperty("pageSpan")) {
+                                        var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan.verify(message.pageSpan);
+                                        if (error)
+                                            return "pageSpan." + error;
+                                    }
+                                    return null;
+                                };
+    
+                                /**
+                                 * Creates a DocumentLayoutBlock message from a plain object. Also converts values to their respective internal types.
+                                 * @function fromObject
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @static
+                                 * @param {Object.<string,*>} object Plain object
+                                 * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock} DocumentLayoutBlock
+                                 */
+                                DocumentLayoutBlock.fromObject = function fromObject(object) {
+                                    if (object instanceof $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock)
+                                        return object;
+                                    var message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock();
+                                    if (object.textBlock != null) {
+                                        if (typeof object.textBlock !== "object")
+                                            throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.textBlock: object expected");
+                                        message.textBlock = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock.fromObject(object.textBlock);
+                                    }
+                                    if (object.tableBlock != null) {
+                                        if (typeof object.tableBlock !== "object")
+                                            throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.tableBlock: object expected");
+                                        message.tableBlock = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.fromObject(object.tableBlock);
+                                    }
+                                    if (object.listBlock != null) {
+                                        if (typeof object.listBlock !== "object")
+                                            throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.listBlock: object expected");
+                                        message.listBlock = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock.fromObject(object.listBlock);
+                                    }
+                                    if (object.blockId != null)
+                                        message.blockId = String(object.blockId);
+                                    if (object.pageSpan != null) {
+                                        if (typeof object.pageSpan !== "object")
+                                            throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.pageSpan: object expected");
+                                        message.pageSpan = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan.fromObject(object.pageSpan);
+                                    }
+                                    return message;
+                                };
+    
+                                /**
+                                 * Creates a plain object from a DocumentLayoutBlock message. Also converts values to other types if specified.
+                                 * @function toObject
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @static
+                                 * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock} message DocumentLayoutBlock
+                                 * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                 * @returns {Object.<string,*>} Plain object
+                                 */
+                                DocumentLayoutBlock.toObject = function toObject(message, options) {
+                                    if (!options)
+                                        options = {};
+                                    var object = {};
+                                    if (options.defaults) {
+                                        object.blockId = "";
+                                        object.pageSpan = null;
+                                    }
+                                    if (message.blockId != null && message.hasOwnProperty("blockId"))
+                                        object.blockId = message.blockId;
+                                    if (message.textBlock != null && message.hasOwnProperty("textBlock")) {
+                                        object.textBlock = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock.toObject(message.textBlock, options);
+                                        if (options.oneofs)
+                                            object.block = "textBlock";
+                                    }
+                                    if (message.tableBlock != null && message.hasOwnProperty("tableBlock")) {
+                                        object.tableBlock = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.toObject(message.tableBlock, options);
+                                        if (options.oneofs)
+                                            object.block = "tableBlock";
+                                    }
+                                    if (message.listBlock != null && message.hasOwnProperty("listBlock")) {
+                                        object.listBlock = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock.toObject(message.listBlock, options);
+                                        if (options.oneofs)
+                                            object.block = "listBlock";
+                                    }
+                                    if (message.pageSpan != null && message.hasOwnProperty("pageSpan"))
+                                        object.pageSpan = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan.toObject(message.pageSpan, options);
+                                    return object;
+                                };
+    
+                                /**
+                                 * Converts this DocumentLayoutBlock to JSON.
+                                 * @function toJSON
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @instance
+                                 * @returns {Object.<string,*>} JSON object
+                                 */
+                                DocumentLayoutBlock.prototype.toJSON = function toJSON() {
+                                    return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                };
+    
+                                /**
+                                 * Gets the default type url for DocumentLayoutBlock
+                                 * @function getTypeUrl
+                                 * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                 * @static
+                                 * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns {string} The default type url
+                                 */
+                                DocumentLayoutBlock.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                    if (typeUrlPrefix === undefined) {
+                                        typeUrlPrefix = "type.googleapis.com";
+                                    }
+                                    return typeUrlPrefix + "/google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock";
+                                };
+    
+                                DocumentLayoutBlock.LayoutPageSpan = (function() {
+    
+                                    /**
+                                     * Properties of a LayoutPageSpan.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @interface ILayoutPageSpan
+                                     * @property {number|null} [pageStart] LayoutPageSpan pageStart
+                                     * @property {number|null} [pageEnd] LayoutPageSpan pageEnd
+                                     */
+    
+                                    /**
+                                     * Constructs a new LayoutPageSpan.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @classdesc Represents a LayoutPageSpan.
+                                     * @implements ILayoutPageSpan
+                                     * @constructor
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan=} [properties] Properties to set
+                                     */
+                                    function LayoutPageSpan(properties) {
+                                        if (properties)
+                                            for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                                if (properties[keys[i]] != null)
+                                                    this[keys[i]] = properties[keys[i]];
+                                    }
+    
+                                    /**
+                                     * LayoutPageSpan pageStart.
+                                     * @member {number} pageStart
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @instance
+                                     */
+                                    LayoutPageSpan.prototype.pageStart = 0;
+    
+                                    /**
+                                     * LayoutPageSpan pageEnd.
+                                     * @member {number} pageEnd
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @instance
+                                     */
+                                    LayoutPageSpan.prototype.pageEnd = 0;
+    
+                                    /**
+                                     * Creates a new LayoutPageSpan instance using the specified properties.
+                                     * @function create
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan=} [properties] Properties to set
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan} LayoutPageSpan instance
+                                     */
+                                    LayoutPageSpan.create = function create(properties) {
+                                        return new LayoutPageSpan(properties);
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutPageSpan message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan.verify|verify} messages.
+                                     * @function encode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan} message LayoutPageSpan message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutPageSpan.encode = function encode(message, writer) {
+                                        if (!writer)
+                                            writer = $Writer.create();
+                                        if (message.pageStart != null && Object.hasOwnProperty.call(message, "pageStart"))
+                                            writer.uint32(/* id 1, wireType 0 =*/8).int32(message.pageStart);
+                                        if (message.pageEnd != null && Object.hasOwnProperty.call(message, "pageEnd"))
+                                            writer.uint32(/* id 2, wireType 0 =*/16).int32(message.pageEnd);
+                                        return writer;
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutPageSpan message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan.verify|verify} messages.
+                                     * @function encodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutPageSpan} message LayoutPageSpan message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutPageSpan.encodeDelimited = function encodeDelimited(message, writer) {
+                                        return this.encode(message, writer).ldelim();
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutPageSpan message from the specified reader or buffer.
+                                     * @function decode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @param {number} [length] Message length if known beforehand
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan} LayoutPageSpan
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutPageSpan.decode = function decode(reader, length) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = $Reader.create(reader);
+                                        var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan();
+                                        while (reader.pos < end) {
+                                            var tag = reader.uint32();
+                                            switch (tag >>> 3) {
+                                            case 1: {
+                                                    message.pageStart = reader.int32();
+                                                    break;
+                                                }
+                                            case 2: {
+                                                    message.pageEnd = reader.int32();
+                                                    break;
+                                                }
+                                            default:
+                                                reader.skipType(tag & 7);
+                                                break;
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutPageSpan message from the specified reader or buffer, length delimited.
+                                     * @function decodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan} LayoutPageSpan
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutPageSpan.decodeDelimited = function decodeDelimited(reader) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = new $Reader(reader);
+                                        return this.decode(reader, reader.uint32());
+                                    };
+    
+                                    /**
+                                     * Verifies a LayoutPageSpan message.
+                                     * @function verify
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @static
+                                     * @param {Object.<string,*>} message Plain object to verify
+                                     * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                     */
+                                    LayoutPageSpan.verify = function verify(message) {
+                                        if (typeof message !== "object" || message === null)
+                                            return "object expected";
+                                        if (message.pageStart != null && message.hasOwnProperty("pageStart"))
+                                            if (!$util.isInteger(message.pageStart))
+                                                return "pageStart: integer expected";
+                                        if (message.pageEnd != null && message.hasOwnProperty("pageEnd"))
+                                            if (!$util.isInteger(message.pageEnd))
+                                                return "pageEnd: integer expected";
+                                        return null;
+                                    };
+    
+                                    /**
+                                     * Creates a LayoutPageSpan message from a plain object. Also converts values to their respective internal types.
+                                     * @function fromObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @static
+                                     * @param {Object.<string,*>} object Plain object
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan} LayoutPageSpan
+                                     */
+                                    LayoutPageSpan.fromObject = function fromObject(object) {
+                                        if (object instanceof $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan)
+                                            return object;
+                                        var message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan();
+                                        if (object.pageStart != null)
+                                            message.pageStart = object.pageStart | 0;
+                                        if (object.pageEnd != null)
+                                            message.pageEnd = object.pageEnd | 0;
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Creates a plain object from a LayoutPageSpan message. Also converts values to other types if specified.
+                                     * @function toObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan} message LayoutPageSpan
+                                     * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                     * @returns {Object.<string,*>} Plain object
+                                     */
+                                    LayoutPageSpan.toObject = function toObject(message, options) {
+                                        if (!options)
+                                            options = {};
+                                        var object = {};
+                                        if (options.defaults) {
+                                            object.pageStart = 0;
+                                            object.pageEnd = 0;
+                                        }
+                                        if (message.pageStart != null && message.hasOwnProperty("pageStart"))
+                                            object.pageStart = message.pageStart;
+                                        if (message.pageEnd != null && message.hasOwnProperty("pageEnd"))
+                                            object.pageEnd = message.pageEnd;
+                                        return object;
+                                    };
+    
+                                    /**
+                                     * Converts this LayoutPageSpan to JSON.
+                                     * @function toJSON
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @instance
+                                     * @returns {Object.<string,*>} JSON object
+                                     */
+                                    LayoutPageSpan.prototype.toJSON = function toJSON() {
+                                        return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                    };
+    
+                                    /**
+                                     * Gets the default type url for LayoutPageSpan
+                                     * @function getTypeUrl
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan
+                                     * @static
+                                     * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                     * @returns {string} The default type url
+                                     */
+                                    LayoutPageSpan.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                        if (typeUrlPrefix === undefined) {
+                                            typeUrlPrefix = "type.googleapis.com";
+                                        }
+                                        return typeUrlPrefix + "/google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutPageSpan";
+                                    };
+    
+                                    return LayoutPageSpan;
+                                })();
+    
+                                DocumentLayoutBlock.LayoutTextBlock = (function() {
+    
+                                    /**
+                                     * Properties of a LayoutTextBlock.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @interface ILayoutTextBlock
+                                     * @property {string|null} [text] LayoutTextBlock text
+                                     * @property {string|null} [type] LayoutTextBlock type
+                                     * @property {Array.<google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock>|null} [blocks] LayoutTextBlock blocks
+                                     */
+    
+                                    /**
+                                     * Constructs a new LayoutTextBlock.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @classdesc Represents a LayoutTextBlock.
+                                     * @implements ILayoutTextBlock
+                                     * @constructor
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock=} [properties] Properties to set
+                                     */
+                                    function LayoutTextBlock(properties) {
+                                        this.blocks = [];
+                                        if (properties)
+                                            for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                                if (properties[keys[i]] != null)
+                                                    this[keys[i]] = properties[keys[i]];
+                                    }
+    
+                                    /**
+                                     * LayoutTextBlock text.
+                                     * @member {string} text
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @instance
+                                     */
+                                    LayoutTextBlock.prototype.text = "";
+    
+                                    /**
+                                     * LayoutTextBlock type.
+                                     * @member {string} type
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @instance
+                                     */
+                                    LayoutTextBlock.prototype.type = "";
+    
+                                    /**
+                                     * LayoutTextBlock blocks.
+                                     * @member {Array.<google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock>} blocks
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @instance
+                                     */
+                                    LayoutTextBlock.prototype.blocks = $util.emptyArray;
+    
+                                    /**
+                                     * Creates a new LayoutTextBlock instance using the specified properties.
+                                     * @function create
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock=} [properties] Properties to set
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock} LayoutTextBlock instance
+                                     */
+                                    LayoutTextBlock.create = function create(properties) {
+                                        return new LayoutTextBlock(properties);
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutTextBlock message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock.verify|verify} messages.
+                                     * @function encode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock} message LayoutTextBlock message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutTextBlock.encode = function encode(message, writer) {
+                                        if (!writer)
+                                            writer = $Writer.create();
+                                        if (message.text != null && Object.hasOwnProperty.call(message, "text"))
+                                            writer.uint32(/* id 1, wireType 2 =*/10).string(message.text);
+                                        if (message.type != null && Object.hasOwnProperty.call(message, "type"))
+                                            writer.uint32(/* id 2, wireType 2 =*/18).string(message.type);
+                                        if (message.blocks != null && message.blocks.length)
+                                            for (var i = 0; i < message.blocks.length; ++i)
+                                                $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.encode(message.blocks[i], writer.uint32(/* id 3, wireType 2 =*/26).fork()).ldelim();
+                                        return writer;
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutTextBlock message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock.verify|verify} messages.
+                                     * @function encodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTextBlock} message LayoutTextBlock message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutTextBlock.encodeDelimited = function encodeDelimited(message, writer) {
+                                        return this.encode(message, writer).ldelim();
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutTextBlock message from the specified reader or buffer.
+                                     * @function decode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @param {number} [length] Message length if known beforehand
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock} LayoutTextBlock
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutTextBlock.decode = function decode(reader, length) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = $Reader.create(reader);
+                                        var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock();
+                                        while (reader.pos < end) {
+                                            var tag = reader.uint32();
+                                            switch (tag >>> 3) {
+                                            case 1: {
+                                                    message.text = reader.string();
+                                                    break;
+                                                }
+                                            case 2: {
+                                                    message.type = reader.string();
+                                                    break;
+                                                }
+                                            case 3: {
+                                                    if (!(message.blocks && message.blocks.length))
+                                                        message.blocks = [];
+                                                    message.blocks.push($root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.decode(reader, reader.uint32()));
+                                                    break;
+                                                }
+                                            default:
+                                                reader.skipType(tag & 7);
+                                                break;
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutTextBlock message from the specified reader or buffer, length delimited.
+                                     * @function decodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock} LayoutTextBlock
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutTextBlock.decodeDelimited = function decodeDelimited(reader) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = new $Reader(reader);
+                                        return this.decode(reader, reader.uint32());
+                                    };
+    
+                                    /**
+                                     * Verifies a LayoutTextBlock message.
+                                     * @function verify
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @static
+                                     * @param {Object.<string,*>} message Plain object to verify
+                                     * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                     */
+                                    LayoutTextBlock.verify = function verify(message) {
+                                        if (typeof message !== "object" || message === null)
+                                            return "object expected";
+                                        if (message.text != null && message.hasOwnProperty("text"))
+                                            if (!$util.isString(message.text))
+                                                return "text: string expected";
+                                        if (message.type != null && message.hasOwnProperty("type"))
+                                            if (!$util.isString(message.type))
+                                                return "type: string expected";
+                                        if (message.blocks != null && message.hasOwnProperty("blocks")) {
+                                            if (!Array.isArray(message.blocks))
+                                                return "blocks: array expected";
+                                            for (var i = 0; i < message.blocks.length; ++i) {
+                                                var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.verify(message.blocks[i]);
+                                                if (error)
+                                                    return "blocks." + error;
+                                            }
+                                        }
+                                        return null;
+                                    };
+    
+                                    /**
+                                     * Creates a LayoutTextBlock message from a plain object. Also converts values to their respective internal types.
+                                     * @function fromObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @static
+                                     * @param {Object.<string,*>} object Plain object
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock} LayoutTextBlock
+                                     */
+                                    LayoutTextBlock.fromObject = function fromObject(object) {
+                                        if (object instanceof $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock)
+                                            return object;
+                                        var message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock();
+                                        if (object.text != null)
+                                            message.text = String(object.text);
+                                        if (object.type != null)
+                                            message.type = String(object.type);
+                                        if (object.blocks) {
+                                            if (!Array.isArray(object.blocks))
+                                                throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock.blocks: array expected");
+                                            message.blocks = [];
+                                            for (var i = 0; i < object.blocks.length; ++i) {
+                                                if (typeof object.blocks[i] !== "object")
+                                                    throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock.blocks: object expected");
+                                                message.blocks[i] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.fromObject(object.blocks[i]);
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Creates a plain object from a LayoutTextBlock message. Also converts values to other types if specified.
+                                     * @function toObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock} message LayoutTextBlock
+                                     * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                     * @returns {Object.<string,*>} Plain object
+                                     */
+                                    LayoutTextBlock.toObject = function toObject(message, options) {
+                                        if (!options)
+                                            options = {};
+                                        var object = {};
+                                        if (options.arrays || options.defaults)
+                                            object.blocks = [];
+                                        if (options.defaults) {
+                                            object.text = "";
+                                            object.type = "";
+                                        }
+                                        if (message.text != null && message.hasOwnProperty("text"))
+                                            object.text = message.text;
+                                        if (message.type != null && message.hasOwnProperty("type"))
+                                            object.type = message.type;
+                                        if (message.blocks && message.blocks.length) {
+                                            object.blocks = [];
+                                            for (var j = 0; j < message.blocks.length; ++j)
+                                                object.blocks[j] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.toObject(message.blocks[j], options);
+                                        }
+                                        return object;
+                                    };
+    
+                                    /**
+                                     * Converts this LayoutTextBlock to JSON.
+                                     * @function toJSON
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @instance
+                                     * @returns {Object.<string,*>} JSON object
+                                     */
+                                    LayoutTextBlock.prototype.toJSON = function toJSON() {
+                                        return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                    };
+    
+                                    /**
+                                     * Gets the default type url for LayoutTextBlock
+                                     * @function getTypeUrl
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock
+                                     * @static
+                                     * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                     * @returns {string} The default type url
+                                     */
+                                    LayoutTextBlock.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                        if (typeUrlPrefix === undefined) {
+                                            typeUrlPrefix = "type.googleapis.com";
+                                        }
+                                        return typeUrlPrefix + "/google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTextBlock";
+                                    };
+    
+                                    return LayoutTextBlock;
+                                })();
+    
+                                DocumentLayoutBlock.LayoutTableBlock = (function() {
+    
+                                    /**
+                                     * Properties of a LayoutTableBlock.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @interface ILayoutTableBlock
+                                     * @property {Array.<google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow>|null} [headerRows] LayoutTableBlock headerRows
+                                     * @property {Array.<google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow>|null} [bodyRows] LayoutTableBlock bodyRows
+                                     * @property {string|null} [caption] LayoutTableBlock caption
+                                     */
+    
+                                    /**
+                                     * Constructs a new LayoutTableBlock.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @classdesc Represents a LayoutTableBlock.
+                                     * @implements ILayoutTableBlock
+                                     * @constructor
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock=} [properties] Properties to set
+                                     */
+                                    function LayoutTableBlock(properties) {
+                                        this.headerRows = [];
+                                        this.bodyRows = [];
+                                        if (properties)
+                                            for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                                if (properties[keys[i]] != null)
+                                                    this[keys[i]] = properties[keys[i]];
+                                    }
+    
+                                    /**
+                                     * LayoutTableBlock headerRows.
+                                     * @member {Array.<google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow>} headerRows
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @instance
+                                     */
+                                    LayoutTableBlock.prototype.headerRows = $util.emptyArray;
+    
+                                    /**
+                                     * LayoutTableBlock bodyRows.
+                                     * @member {Array.<google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow>} bodyRows
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @instance
+                                     */
+                                    LayoutTableBlock.prototype.bodyRows = $util.emptyArray;
+    
+                                    /**
+                                     * LayoutTableBlock caption.
+                                     * @member {string} caption
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @instance
+                                     */
+                                    LayoutTableBlock.prototype.caption = "";
+    
+                                    /**
+                                     * Creates a new LayoutTableBlock instance using the specified properties.
+                                     * @function create
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock=} [properties] Properties to set
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock} LayoutTableBlock instance
+                                     */
+                                    LayoutTableBlock.create = function create(properties) {
+                                        return new LayoutTableBlock(properties);
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutTableBlock message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.verify|verify} messages.
+                                     * @function encode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock} message LayoutTableBlock message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutTableBlock.encode = function encode(message, writer) {
+                                        if (!writer)
+                                            writer = $Writer.create();
+                                        if (message.headerRows != null && message.headerRows.length)
+                                            for (var i = 0; i < message.headerRows.length; ++i)
+                                                $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.encode(message.headerRows[i], writer.uint32(/* id 1, wireType 2 =*/10).fork()).ldelim();
+                                        if (message.bodyRows != null && message.bodyRows.length)
+                                            for (var i = 0; i < message.bodyRows.length; ++i)
+                                                $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.encode(message.bodyRows[i], writer.uint32(/* id 2, wireType 2 =*/18).fork()).ldelim();
+                                        if (message.caption != null && Object.hasOwnProperty.call(message, "caption"))
+                                            writer.uint32(/* id 3, wireType 2 =*/26).string(message.caption);
+                                        return writer;
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutTableBlock message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.verify|verify} messages.
+                                     * @function encodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableBlock} message LayoutTableBlock message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutTableBlock.encodeDelimited = function encodeDelimited(message, writer) {
+                                        return this.encode(message, writer).ldelim();
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutTableBlock message from the specified reader or buffer.
+                                     * @function decode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @param {number} [length] Message length if known beforehand
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock} LayoutTableBlock
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutTableBlock.decode = function decode(reader, length) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = $Reader.create(reader);
+                                        var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock();
+                                        while (reader.pos < end) {
+                                            var tag = reader.uint32();
+                                            switch (tag >>> 3) {
+                                            case 1: {
+                                                    if (!(message.headerRows && message.headerRows.length))
+                                                        message.headerRows = [];
+                                                    message.headerRows.push($root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.decode(reader, reader.uint32()));
+                                                    break;
+                                                }
+                                            case 2: {
+                                                    if (!(message.bodyRows && message.bodyRows.length))
+                                                        message.bodyRows = [];
+                                                    message.bodyRows.push($root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.decode(reader, reader.uint32()));
+                                                    break;
+                                                }
+                                            case 3: {
+                                                    message.caption = reader.string();
+                                                    break;
+                                                }
+                                            default:
+                                                reader.skipType(tag & 7);
+                                                break;
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutTableBlock message from the specified reader or buffer, length delimited.
+                                     * @function decodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock} LayoutTableBlock
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutTableBlock.decodeDelimited = function decodeDelimited(reader) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = new $Reader(reader);
+                                        return this.decode(reader, reader.uint32());
+                                    };
+    
+                                    /**
+                                     * Verifies a LayoutTableBlock message.
+                                     * @function verify
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @static
+                                     * @param {Object.<string,*>} message Plain object to verify
+                                     * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                     */
+                                    LayoutTableBlock.verify = function verify(message) {
+                                        if (typeof message !== "object" || message === null)
+                                            return "object expected";
+                                        if (message.headerRows != null && message.hasOwnProperty("headerRows")) {
+                                            if (!Array.isArray(message.headerRows))
+                                                return "headerRows: array expected";
+                                            for (var i = 0; i < message.headerRows.length; ++i) {
+                                                var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.verify(message.headerRows[i]);
+                                                if (error)
+                                                    return "headerRows." + error;
+                                            }
+                                        }
+                                        if (message.bodyRows != null && message.hasOwnProperty("bodyRows")) {
+                                            if (!Array.isArray(message.bodyRows))
+                                                return "bodyRows: array expected";
+                                            for (var i = 0; i < message.bodyRows.length; ++i) {
+                                                var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.verify(message.bodyRows[i]);
+                                                if (error)
+                                                    return "bodyRows." + error;
+                                            }
+                                        }
+                                        if (message.caption != null && message.hasOwnProperty("caption"))
+                                            if (!$util.isString(message.caption))
+                                                return "caption: string expected";
+                                        return null;
+                                    };
+    
+                                    /**
+                                     * Creates a LayoutTableBlock message from a plain object. Also converts values to their respective internal types.
+                                     * @function fromObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @static
+                                     * @param {Object.<string,*>} object Plain object
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock} LayoutTableBlock
+                                     */
+                                    LayoutTableBlock.fromObject = function fromObject(object) {
+                                        if (object instanceof $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock)
+                                            return object;
+                                        var message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock();
+                                        if (object.headerRows) {
+                                            if (!Array.isArray(object.headerRows))
+                                                throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.headerRows: array expected");
+                                            message.headerRows = [];
+                                            for (var i = 0; i < object.headerRows.length; ++i) {
+                                                if (typeof object.headerRows[i] !== "object")
+                                                    throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.headerRows: object expected");
+                                                message.headerRows[i] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.fromObject(object.headerRows[i]);
+                                            }
+                                        }
+                                        if (object.bodyRows) {
+                                            if (!Array.isArray(object.bodyRows))
+                                                throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.bodyRows: array expected");
+                                            message.bodyRows = [];
+                                            for (var i = 0; i < object.bodyRows.length; ++i) {
+                                                if (typeof object.bodyRows[i] !== "object")
+                                                    throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock.bodyRows: object expected");
+                                                message.bodyRows[i] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.fromObject(object.bodyRows[i]);
+                                            }
+                                        }
+                                        if (object.caption != null)
+                                            message.caption = String(object.caption);
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Creates a plain object from a LayoutTableBlock message. Also converts values to other types if specified.
+                                     * @function toObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock} message LayoutTableBlock
+                                     * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                     * @returns {Object.<string,*>} Plain object
+                                     */
+                                    LayoutTableBlock.toObject = function toObject(message, options) {
+                                        if (!options)
+                                            options = {};
+                                        var object = {};
+                                        if (options.arrays || options.defaults) {
+                                            object.headerRows = [];
+                                            object.bodyRows = [];
+                                        }
+                                        if (options.defaults)
+                                            object.caption = "";
+                                        if (message.headerRows && message.headerRows.length) {
+                                            object.headerRows = [];
+                                            for (var j = 0; j < message.headerRows.length; ++j)
+                                                object.headerRows[j] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.toObject(message.headerRows[j], options);
+                                        }
+                                        if (message.bodyRows && message.bodyRows.length) {
+                                            object.bodyRows = [];
+                                            for (var j = 0; j < message.bodyRows.length; ++j)
+                                                object.bodyRows[j] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.toObject(message.bodyRows[j], options);
+                                        }
+                                        if (message.caption != null && message.hasOwnProperty("caption"))
+                                            object.caption = message.caption;
+                                        return object;
+                                    };
+    
+                                    /**
+                                     * Converts this LayoutTableBlock to JSON.
+                                     * @function toJSON
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @instance
+                                     * @returns {Object.<string,*>} JSON object
+                                     */
+                                    LayoutTableBlock.prototype.toJSON = function toJSON() {
+                                        return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                    };
+    
+                                    /**
+                                     * Gets the default type url for LayoutTableBlock
+                                     * @function getTypeUrl
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock
+                                     * @static
+                                     * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                     * @returns {string} The default type url
+                                     */
+                                    LayoutTableBlock.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                        if (typeUrlPrefix === undefined) {
+                                            typeUrlPrefix = "type.googleapis.com";
+                                        }
+                                        return typeUrlPrefix + "/google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableBlock";
+                                    };
+    
+                                    return LayoutTableBlock;
+                                })();
+    
+                                DocumentLayoutBlock.LayoutTableRow = (function() {
+    
+                                    /**
+                                     * Properties of a LayoutTableRow.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @interface ILayoutTableRow
+                                     * @property {Array.<google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell>|null} [cells] LayoutTableRow cells
+                                     */
+    
+                                    /**
+                                     * Constructs a new LayoutTableRow.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @classdesc Represents a LayoutTableRow.
+                                     * @implements ILayoutTableRow
+                                     * @constructor
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow=} [properties] Properties to set
+                                     */
+                                    function LayoutTableRow(properties) {
+                                        this.cells = [];
+                                        if (properties)
+                                            for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                                if (properties[keys[i]] != null)
+                                                    this[keys[i]] = properties[keys[i]];
+                                    }
+    
+                                    /**
+                                     * LayoutTableRow cells.
+                                     * @member {Array.<google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell>} cells
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow
+                                     * @instance
+                                     */
+                                    LayoutTableRow.prototype.cells = $util.emptyArray;
+    
+                                    /**
+                                     * Creates a new LayoutTableRow instance using the specified properties.
+                                     * @function create
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow=} [properties] Properties to set
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow} LayoutTableRow instance
+                                     */
+                                    LayoutTableRow.create = function create(properties) {
+                                        return new LayoutTableRow(properties);
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutTableRow message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.verify|verify} messages.
+                                     * @function encode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow} message LayoutTableRow message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutTableRow.encode = function encode(message, writer) {
+                                        if (!writer)
+                                            writer = $Writer.create();
+                                        if (message.cells != null && message.cells.length)
+                                            for (var i = 0; i < message.cells.length; ++i)
+                                                $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell.encode(message.cells[i], writer.uint32(/* id 1, wireType 2 =*/10).fork()).ldelim();
+                                        return writer;
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutTableRow message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.verify|verify} messages.
+                                     * @function encodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableRow} message LayoutTableRow message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutTableRow.encodeDelimited = function encodeDelimited(message, writer) {
+                                        return this.encode(message, writer).ldelim();
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutTableRow message from the specified reader or buffer.
+                                     * @function decode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @param {number} [length] Message length if known beforehand
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow} LayoutTableRow
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutTableRow.decode = function decode(reader, length) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = $Reader.create(reader);
+                                        var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow();
+                                        while (reader.pos < end) {
+                                            var tag = reader.uint32();
+                                            switch (tag >>> 3) {
+                                            case 1: {
+                                                    if (!(message.cells && message.cells.length))
+                                                        message.cells = [];
+                                                    message.cells.push($root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell.decode(reader, reader.uint32()));
+                                                    break;
+                                                }
+                                            default:
+                                                reader.skipType(tag & 7);
+                                                break;
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutTableRow message from the specified reader or buffer, length delimited.
+                                     * @function decodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow} LayoutTableRow
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutTableRow.decodeDelimited = function decodeDelimited(reader) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = new $Reader(reader);
+                                        return this.decode(reader, reader.uint32());
+                                    };
+    
+                                    /**
+                                     * Verifies a LayoutTableRow message.
+                                     * @function verify
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow
+                                     * @static
+                                     * @param {Object.<string,*>} message Plain object to verify
+                                     * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                     */
+                                    LayoutTableRow.verify = function verify(message) {
+                                        if (typeof message !== "object" || message === null)
+                                            return "object expected";
+                                        if (message.cells != null && message.hasOwnProperty("cells")) {
+                                            if (!Array.isArray(message.cells))
+                                                return "cells: array expected";
+                                            for (var i = 0; i < message.cells.length; ++i) {
+                                                var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell.verify(message.cells[i]);
+                                                if (error)
+                                                    return "cells." + error;
+                                            }
+                                        }
+                                        return null;
+                                    };
+    
+                                    /**
+                                     * Creates a LayoutTableRow message from a plain object. Also converts values to their respective internal types.
+                                     * @function fromObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow
+                                     * @static
+                                     * @param {Object.<string,*>} object Plain object
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow} LayoutTableRow
+                                     */
+                                    LayoutTableRow.fromObject = function fromObject(object) {
+                                        if (object instanceof $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow)
+                                            return object;
+                                        var message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow();
+                                        if (object.cells) {
+                                            if (!Array.isArray(object.cells))
+                                                throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.cells: array expected");
+                                            message.cells = [];
+                                            for (var i = 0; i < object.cells.length; ++i) {
+                                                if (typeof object.cells[i] !== "object")
+                                                    throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow.cells: object expected");
+                                                message.cells[i] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell.fromObject(object.cells[i]);
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Creates a plain object from a LayoutTableRow message. Also converts values to other types if specified.
+                                     * @function toObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow} message LayoutTableRow
+                                     * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                     * @returns {Object.<string,*>} Plain object
+                                     */
+                                    LayoutTableRow.toObject = function toObject(message, options) {
+                                        if (!options)
+                                            options = {};
+                                        var object = {};
+                                        if (options.arrays || options.defaults)
+                                            object.cells = [];
+                                        if (message.cells && message.cells.length) {
+                                            object.cells = [];
+                                            for (var j = 0; j < message.cells.length; ++j)
+                                                object.cells[j] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell.toObject(message.cells[j], options);
+                                        }
+                                        return object;
+                                    };
+    
+                                    /**
+                                     * Converts this LayoutTableRow to JSON.
+                                     * @function toJSON
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow
+                                     * @instance
+                                     * @returns {Object.<string,*>} JSON object
+                                     */
+                                    LayoutTableRow.prototype.toJSON = function toJSON() {
+                                        return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                    };
+    
+                                    /**
+                                     * Gets the default type url for LayoutTableRow
+                                     * @function getTypeUrl
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow
+                                     * @static
+                                     * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                     * @returns {string} The default type url
+                                     */
+                                    LayoutTableRow.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                        if (typeUrlPrefix === undefined) {
+                                            typeUrlPrefix = "type.googleapis.com";
+                                        }
+                                        return typeUrlPrefix + "/google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableRow";
+                                    };
+    
+                                    return LayoutTableRow;
+                                })();
+    
+                                DocumentLayoutBlock.LayoutTableCell = (function() {
+    
+                                    /**
+                                     * Properties of a LayoutTableCell.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @interface ILayoutTableCell
+                                     * @property {Array.<google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock>|null} [blocks] LayoutTableCell blocks
+                                     * @property {number|null} [rowSpan] LayoutTableCell rowSpan
+                                     * @property {number|null} [colSpan] LayoutTableCell colSpan
+                                     */
+    
+                                    /**
+                                     * Constructs a new LayoutTableCell.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @classdesc Represents a LayoutTableCell.
+                                     * @implements ILayoutTableCell
+                                     * @constructor
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell=} [properties] Properties to set
+                                     */
+                                    function LayoutTableCell(properties) {
+                                        this.blocks = [];
+                                        if (properties)
+                                            for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                                if (properties[keys[i]] != null)
+                                                    this[keys[i]] = properties[keys[i]];
+                                    }
+    
+                                    /**
+                                     * LayoutTableCell blocks.
+                                     * @member {Array.<google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock>} blocks
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @instance
+                                     */
+                                    LayoutTableCell.prototype.blocks = $util.emptyArray;
+    
+                                    /**
+                                     * LayoutTableCell rowSpan.
+                                     * @member {number} rowSpan
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @instance
+                                     */
+                                    LayoutTableCell.prototype.rowSpan = 0;
+    
+                                    /**
+                                     * LayoutTableCell colSpan.
+                                     * @member {number} colSpan
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @instance
+                                     */
+                                    LayoutTableCell.prototype.colSpan = 0;
+    
+                                    /**
+                                     * Creates a new LayoutTableCell instance using the specified properties.
+                                     * @function create
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell=} [properties] Properties to set
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell} LayoutTableCell instance
+                                     */
+                                    LayoutTableCell.create = function create(properties) {
+                                        return new LayoutTableCell(properties);
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutTableCell message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell.verify|verify} messages.
+                                     * @function encode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell} message LayoutTableCell message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutTableCell.encode = function encode(message, writer) {
+                                        if (!writer)
+                                            writer = $Writer.create();
+                                        if (message.blocks != null && message.blocks.length)
+                                            for (var i = 0; i < message.blocks.length; ++i)
+                                                $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.encode(message.blocks[i], writer.uint32(/* id 1, wireType 2 =*/10).fork()).ldelim();
+                                        if (message.rowSpan != null && Object.hasOwnProperty.call(message, "rowSpan"))
+                                            writer.uint32(/* id 2, wireType 0 =*/16).int32(message.rowSpan);
+                                        if (message.colSpan != null && Object.hasOwnProperty.call(message, "colSpan"))
+                                            writer.uint32(/* id 3, wireType 0 =*/24).int32(message.colSpan);
+                                        return writer;
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutTableCell message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell.verify|verify} messages.
+                                     * @function encodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutTableCell} message LayoutTableCell message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutTableCell.encodeDelimited = function encodeDelimited(message, writer) {
+                                        return this.encode(message, writer).ldelim();
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutTableCell message from the specified reader or buffer.
+                                     * @function decode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @param {number} [length] Message length if known beforehand
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell} LayoutTableCell
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutTableCell.decode = function decode(reader, length) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = $Reader.create(reader);
+                                        var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell();
+                                        while (reader.pos < end) {
+                                            var tag = reader.uint32();
+                                            switch (tag >>> 3) {
+                                            case 1: {
+                                                    if (!(message.blocks && message.blocks.length))
+                                                        message.blocks = [];
+                                                    message.blocks.push($root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.decode(reader, reader.uint32()));
+                                                    break;
+                                                }
+                                            case 2: {
+                                                    message.rowSpan = reader.int32();
+                                                    break;
+                                                }
+                                            case 3: {
+                                                    message.colSpan = reader.int32();
+                                                    break;
+                                                }
+                                            default:
+                                                reader.skipType(tag & 7);
+                                                break;
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutTableCell message from the specified reader or buffer, length delimited.
+                                     * @function decodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell} LayoutTableCell
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutTableCell.decodeDelimited = function decodeDelimited(reader) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = new $Reader(reader);
+                                        return this.decode(reader, reader.uint32());
+                                    };
+    
+                                    /**
+                                     * Verifies a LayoutTableCell message.
+                                     * @function verify
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @static
+                                     * @param {Object.<string,*>} message Plain object to verify
+                                     * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                     */
+                                    LayoutTableCell.verify = function verify(message) {
+                                        if (typeof message !== "object" || message === null)
+                                            return "object expected";
+                                        if (message.blocks != null && message.hasOwnProperty("blocks")) {
+                                            if (!Array.isArray(message.blocks))
+                                                return "blocks: array expected";
+                                            for (var i = 0; i < message.blocks.length; ++i) {
+                                                var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.verify(message.blocks[i]);
+                                                if (error)
+                                                    return "blocks." + error;
+                                            }
+                                        }
+                                        if (message.rowSpan != null && message.hasOwnProperty("rowSpan"))
+                                            if (!$util.isInteger(message.rowSpan))
+                                                return "rowSpan: integer expected";
+                                        if (message.colSpan != null && message.hasOwnProperty("colSpan"))
+                                            if (!$util.isInteger(message.colSpan))
+                                                return "colSpan: integer expected";
+                                        return null;
+                                    };
+    
+                                    /**
+                                     * Creates a LayoutTableCell message from a plain object. Also converts values to their respective internal types.
+                                     * @function fromObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @static
+                                     * @param {Object.<string,*>} object Plain object
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell} LayoutTableCell
+                                     */
+                                    LayoutTableCell.fromObject = function fromObject(object) {
+                                        if (object instanceof $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell)
+                                            return object;
+                                        var message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell();
+                                        if (object.blocks) {
+                                            if (!Array.isArray(object.blocks))
+                                                throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell.blocks: array expected");
+                                            message.blocks = [];
+                                            for (var i = 0; i < object.blocks.length; ++i) {
+                                                if (typeof object.blocks[i] !== "object")
+                                                    throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell.blocks: object expected");
+                                                message.blocks[i] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.fromObject(object.blocks[i]);
+                                            }
+                                        }
+                                        if (object.rowSpan != null)
+                                            message.rowSpan = object.rowSpan | 0;
+                                        if (object.colSpan != null)
+                                            message.colSpan = object.colSpan | 0;
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Creates a plain object from a LayoutTableCell message. Also converts values to other types if specified.
+                                     * @function toObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell} message LayoutTableCell
+                                     * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                     * @returns {Object.<string,*>} Plain object
+                                     */
+                                    LayoutTableCell.toObject = function toObject(message, options) {
+                                        if (!options)
+                                            options = {};
+                                        var object = {};
+                                        if (options.arrays || options.defaults)
+                                            object.blocks = [];
+                                        if (options.defaults) {
+                                            object.rowSpan = 0;
+                                            object.colSpan = 0;
+                                        }
+                                        if (message.blocks && message.blocks.length) {
+                                            object.blocks = [];
+                                            for (var j = 0; j < message.blocks.length; ++j)
+                                                object.blocks[j] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.toObject(message.blocks[j], options);
+                                        }
+                                        if (message.rowSpan != null && message.hasOwnProperty("rowSpan"))
+                                            object.rowSpan = message.rowSpan;
+                                        if (message.colSpan != null && message.hasOwnProperty("colSpan"))
+                                            object.colSpan = message.colSpan;
+                                        return object;
+                                    };
+    
+                                    /**
+                                     * Converts this LayoutTableCell to JSON.
+                                     * @function toJSON
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @instance
+                                     * @returns {Object.<string,*>} JSON object
+                                     */
+                                    LayoutTableCell.prototype.toJSON = function toJSON() {
+                                        return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                    };
+    
+                                    /**
+                                     * Gets the default type url for LayoutTableCell
+                                     * @function getTypeUrl
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell
+                                     * @static
+                                     * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                     * @returns {string} The default type url
+                                     */
+                                    LayoutTableCell.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                        if (typeUrlPrefix === undefined) {
+                                            typeUrlPrefix = "type.googleapis.com";
+                                        }
+                                        return typeUrlPrefix + "/google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutTableCell";
+                                    };
+    
+                                    return LayoutTableCell;
+                                })();
+    
+                                DocumentLayoutBlock.LayoutListBlock = (function() {
+    
+                                    /**
+                                     * Properties of a LayoutListBlock.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @interface ILayoutListBlock
+                                     * @property {Array.<google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry>|null} [listEntries] LayoutListBlock listEntries
+                                     * @property {string|null} [type] LayoutListBlock type
+                                     */
+    
+                                    /**
+                                     * Constructs a new LayoutListBlock.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @classdesc Represents a LayoutListBlock.
+                                     * @implements ILayoutListBlock
+                                     * @constructor
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock=} [properties] Properties to set
+                                     */
+                                    function LayoutListBlock(properties) {
+                                        this.listEntries = [];
+                                        if (properties)
+                                            for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                                if (properties[keys[i]] != null)
+                                                    this[keys[i]] = properties[keys[i]];
+                                    }
+    
+                                    /**
+                                     * LayoutListBlock listEntries.
+                                     * @member {Array.<google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry>} listEntries
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @instance
+                                     */
+                                    LayoutListBlock.prototype.listEntries = $util.emptyArray;
+    
+                                    /**
+                                     * LayoutListBlock type.
+                                     * @member {string} type
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @instance
+                                     */
+                                    LayoutListBlock.prototype.type = "";
+    
+                                    /**
+                                     * Creates a new LayoutListBlock instance using the specified properties.
+                                     * @function create
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock=} [properties] Properties to set
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock} LayoutListBlock instance
+                                     */
+                                    LayoutListBlock.create = function create(properties) {
+                                        return new LayoutListBlock(properties);
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutListBlock message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock.verify|verify} messages.
+                                     * @function encode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock} message LayoutListBlock message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutListBlock.encode = function encode(message, writer) {
+                                        if (!writer)
+                                            writer = $Writer.create();
+                                        if (message.listEntries != null && message.listEntries.length)
+                                            for (var i = 0; i < message.listEntries.length; ++i)
+                                                $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry.encode(message.listEntries[i], writer.uint32(/* id 1, wireType 2 =*/10).fork()).ldelim();
+                                        if (message.type != null && Object.hasOwnProperty.call(message, "type"))
+                                            writer.uint32(/* id 2, wireType 2 =*/18).string(message.type);
+                                        return writer;
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutListBlock message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock.verify|verify} messages.
+                                     * @function encodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListBlock} message LayoutListBlock message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutListBlock.encodeDelimited = function encodeDelimited(message, writer) {
+                                        return this.encode(message, writer).ldelim();
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutListBlock message from the specified reader or buffer.
+                                     * @function decode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @param {number} [length] Message length if known beforehand
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock} LayoutListBlock
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutListBlock.decode = function decode(reader, length) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = $Reader.create(reader);
+                                        var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock();
+                                        while (reader.pos < end) {
+                                            var tag = reader.uint32();
+                                            switch (tag >>> 3) {
+                                            case 1: {
+                                                    if (!(message.listEntries && message.listEntries.length))
+                                                        message.listEntries = [];
+                                                    message.listEntries.push($root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry.decode(reader, reader.uint32()));
+                                                    break;
+                                                }
+                                            case 2: {
+                                                    message.type = reader.string();
+                                                    break;
+                                                }
+                                            default:
+                                                reader.skipType(tag & 7);
+                                                break;
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutListBlock message from the specified reader or buffer, length delimited.
+                                     * @function decodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock} LayoutListBlock
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutListBlock.decodeDelimited = function decodeDelimited(reader) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = new $Reader(reader);
+                                        return this.decode(reader, reader.uint32());
+                                    };
+    
+                                    /**
+                                     * Verifies a LayoutListBlock message.
+                                     * @function verify
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @static
+                                     * @param {Object.<string,*>} message Plain object to verify
+                                     * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                     */
+                                    LayoutListBlock.verify = function verify(message) {
+                                        if (typeof message !== "object" || message === null)
+                                            return "object expected";
+                                        if (message.listEntries != null && message.hasOwnProperty("listEntries")) {
+                                            if (!Array.isArray(message.listEntries))
+                                                return "listEntries: array expected";
+                                            for (var i = 0; i < message.listEntries.length; ++i) {
+                                                var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry.verify(message.listEntries[i]);
+                                                if (error)
+                                                    return "listEntries." + error;
+                                            }
+                                        }
+                                        if (message.type != null && message.hasOwnProperty("type"))
+                                            if (!$util.isString(message.type))
+                                                return "type: string expected";
+                                        return null;
+                                    };
+    
+                                    /**
+                                     * Creates a LayoutListBlock message from a plain object. Also converts values to their respective internal types.
+                                     * @function fromObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @static
+                                     * @param {Object.<string,*>} object Plain object
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock} LayoutListBlock
+                                     */
+                                    LayoutListBlock.fromObject = function fromObject(object) {
+                                        if (object instanceof $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock)
+                                            return object;
+                                        var message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock();
+                                        if (object.listEntries) {
+                                            if (!Array.isArray(object.listEntries))
+                                                throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock.listEntries: array expected");
+                                            message.listEntries = [];
+                                            for (var i = 0; i < object.listEntries.length; ++i) {
+                                                if (typeof object.listEntries[i] !== "object")
+                                                    throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock.listEntries: object expected");
+                                                message.listEntries[i] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry.fromObject(object.listEntries[i]);
+                                            }
+                                        }
+                                        if (object.type != null)
+                                            message.type = String(object.type);
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Creates a plain object from a LayoutListBlock message. Also converts values to other types if specified.
+                                     * @function toObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock} message LayoutListBlock
+                                     * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                     * @returns {Object.<string,*>} Plain object
+                                     */
+                                    LayoutListBlock.toObject = function toObject(message, options) {
+                                        if (!options)
+                                            options = {};
+                                        var object = {};
+                                        if (options.arrays || options.defaults)
+                                            object.listEntries = [];
+                                        if (options.defaults)
+                                            object.type = "";
+                                        if (message.listEntries && message.listEntries.length) {
+                                            object.listEntries = [];
+                                            for (var j = 0; j < message.listEntries.length; ++j)
+                                                object.listEntries[j] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry.toObject(message.listEntries[j], options);
+                                        }
+                                        if (message.type != null && message.hasOwnProperty("type"))
+                                            object.type = message.type;
+                                        return object;
+                                    };
+    
+                                    /**
+                                     * Converts this LayoutListBlock to JSON.
+                                     * @function toJSON
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @instance
+                                     * @returns {Object.<string,*>} JSON object
+                                     */
+                                    LayoutListBlock.prototype.toJSON = function toJSON() {
+                                        return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                    };
+    
+                                    /**
+                                     * Gets the default type url for LayoutListBlock
+                                     * @function getTypeUrl
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock
+                                     * @static
+                                     * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                     * @returns {string} The default type url
+                                     */
+                                    LayoutListBlock.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                        if (typeUrlPrefix === undefined) {
+                                            typeUrlPrefix = "type.googleapis.com";
+                                        }
+                                        return typeUrlPrefix + "/google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListBlock";
+                                    };
+    
+                                    return LayoutListBlock;
+                                })();
+    
+                                DocumentLayoutBlock.LayoutListEntry = (function() {
+    
+                                    /**
+                                     * Properties of a LayoutListEntry.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @interface ILayoutListEntry
+                                     * @property {Array.<google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock>|null} [blocks] LayoutListEntry blocks
+                                     */
+    
+                                    /**
+                                     * Constructs a new LayoutListEntry.
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock
+                                     * @classdesc Represents a LayoutListEntry.
+                                     * @implements ILayoutListEntry
+                                     * @constructor
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry=} [properties] Properties to set
+                                     */
+                                    function LayoutListEntry(properties) {
+                                        this.blocks = [];
+                                        if (properties)
+                                            for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                                if (properties[keys[i]] != null)
+                                                    this[keys[i]] = properties[keys[i]];
+                                    }
+    
+                                    /**
+                                     * LayoutListEntry blocks.
+                                     * @member {Array.<google.cloud.documentai.v1.Document.DocumentLayout.IDocumentLayoutBlock>} blocks
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry
+                                     * @instance
+                                     */
+                                    LayoutListEntry.prototype.blocks = $util.emptyArray;
+    
+                                    /**
+                                     * Creates a new LayoutListEntry instance using the specified properties.
+                                     * @function create
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry=} [properties] Properties to set
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry} LayoutListEntry instance
+                                     */
+                                    LayoutListEntry.create = function create(properties) {
+                                        return new LayoutListEntry(properties);
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutListEntry message. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry.verify|verify} messages.
+                                     * @function encode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry} message LayoutListEntry message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutListEntry.encode = function encode(message, writer) {
+                                        if (!writer)
+                                            writer = $Writer.create();
+                                        if (message.blocks != null && message.blocks.length)
+                                            for (var i = 0; i < message.blocks.length; ++i)
+                                                $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.encode(message.blocks[i], writer.uint32(/* id 1, wireType 2 =*/10).fork()).ldelim();
+                                        return writer;
+                                    };
+    
+                                    /**
+                                     * Encodes the specified LayoutListEntry message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry.verify|verify} messages.
+                                     * @function encodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.ILayoutListEntry} message LayoutListEntry message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    LayoutListEntry.encodeDelimited = function encodeDelimited(message, writer) {
+                                        return this.encode(message, writer).ldelim();
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutListEntry message from the specified reader or buffer.
+                                     * @function decode
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @param {number} [length] Message length if known beforehand
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry} LayoutListEntry
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutListEntry.decode = function decode(reader, length) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = $Reader.create(reader);
+                                        var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry();
+                                        while (reader.pos < end) {
+                                            var tag = reader.uint32();
+                                            switch (tag >>> 3) {
+                                            case 1: {
+                                                    if (!(message.blocks && message.blocks.length))
+                                                        message.blocks = [];
+                                                    message.blocks.push($root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.decode(reader, reader.uint32()));
+                                                    break;
+                                                }
+                                            default:
+                                                reader.skipType(tag & 7);
+                                                break;
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Decodes a LayoutListEntry message from the specified reader or buffer, length delimited.
+                                     * @function decodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry} LayoutListEntry
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    LayoutListEntry.decodeDelimited = function decodeDelimited(reader) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = new $Reader(reader);
+                                        return this.decode(reader, reader.uint32());
+                                    };
+    
+                                    /**
+                                     * Verifies a LayoutListEntry message.
+                                     * @function verify
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry
+                                     * @static
+                                     * @param {Object.<string,*>} message Plain object to verify
+                                     * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                     */
+                                    LayoutListEntry.verify = function verify(message) {
+                                        if (typeof message !== "object" || message === null)
+                                            return "object expected";
+                                        if (message.blocks != null && message.hasOwnProperty("blocks")) {
+                                            if (!Array.isArray(message.blocks))
+                                                return "blocks: array expected";
+                                            for (var i = 0; i < message.blocks.length; ++i) {
+                                                var error = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.verify(message.blocks[i]);
+                                                if (error)
+                                                    return "blocks." + error;
+                                            }
+                                        }
+                                        return null;
+                                    };
+    
+                                    /**
+                                     * Creates a LayoutListEntry message from a plain object. Also converts values to their respective internal types.
+                                     * @function fromObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry
+                                     * @static
+                                     * @param {Object.<string,*>} object Plain object
+                                     * @returns {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry} LayoutListEntry
+                                     */
+                                    LayoutListEntry.fromObject = function fromObject(object) {
+                                        if (object instanceof $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry)
+                                            return object;
+                                        var message = new $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry();
+                                        if (object.blocks) {
+                                            if (!Array.isArray(object.blocks))
+                                                throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry.blocks: array expected");
+                                            message.blocks = [];
+                                            for (var i = 0; i < object.blocks.length; ++i) {
+                                                if (typeof object.blocks[i] !== "object")
+                                                    throw TypeError(".google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry.blocks: object expected");
+                                                message.blocks[i] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.fromObject(object.blocks[i]);
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Creates a plain object from a LayoutListEntry message. Also converts values to other types if specified.
+                                     * @function toObject
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry} message LayoutListEntry
+                                     * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                     * @returns {Object.<string,*>} Plain object
+                                     */
+                                    LayoutListEntry.toObject = function toObject(message, options) {
+                                        if (!options)
+                                            options = {};
+                                        var object = {};
+                                        if (options.arrays || options.defaults)
+                                            object.blocks = [];
+                                        if (message.blocks && message.blocks.length) {
+                                            object.blocks = [];
+                                            for (var j = 0; j < message.blocks.length; ++j)
+                                                object.blocks[j] = $root.google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.toObject(message.blocks[j], options);
+                                        }
+                                        return object;
+                                    };
+    
+                                    /**
+                                     * Converts this LayoutListEntry to JSON.
+                                     * @function toJSON
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry
+                                     * @instance
+                                     * @returns {Object.<string,*>} JSON object
+                                     */
+                                    LayoutListEntry.prototype.toJSON = function toJSON() {
+                                        return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                    };
+    
+                                    /**
+                                     * Gets the default type url for LayoutListEntry
+                                     * @function getTypeUrl
+                                     * @memberof google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry
+                                     * @static
+                                     * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                     * @returns {string} The default type url
+                                     */
+                                    LayoutListEntry.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                        if (typeUrlPrefix === undefined) {
+                                            typeUrlPrefix = "type.googleapis.com";
+                                        }
+                                        return typeUrlPrefix + "/google.cloud.documentai.v1.Document.DocumentLayout.DocumentLayoutBlock.LayoutListEntry";
+                                    };
+    
+                                    return LayoutListEntry;
+                                })();
+    
+                                return DocumentLayoutBlock;
+                            })();
+    
+                            return DocumentLayout;
+                        })();
+    
+                        Document.ChunkedDocument = (function() {
+    
+                            /**
+                             * Properties of a ChunkedDocument.
+                             * @memberof google.cloud.documentai.v1.Document
+                             * @interface IChunkedDocument
+                             * @property {Array.<google.cloud.documentai.v1.Document.ChunkedDocument.IChunk>|null} [chunks] ChunkedDocument chunks
+                             */
+    
+                            /**
+                             * Constructs a new ChunkedDocument.
+                             * @memberof google.cloud.documentai.v1.Document
+                             * @classdesc Represents a ChunkedDocument.
+                             * @implements IChunkedDocument
+                             * @constructor
+                             * @param {google.cloud.documentai.v1.Document.IChunkedDocument=} [properties] Properties to set
+                             */
+                            function ChunkedDocument(properties) {
+                                this.chunks = [];
+                                if (properties)
+                                    for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                        if (properties[keys[i]] != null)
+                                            this[keys[i]] = properties[keys[i]];
+                            }
+    
+                            /**
+                             * ChunkedDocument chunks.
+                             * @member {Array.<google.cloud.documentai.v1.Document.ChunkedDocument.IChunk>} chunks
+                             * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                             * @instance
+                             */
+                            ChunkedDocument.prototype.chunks = $util.emptyArray;
+    
+                            /**
+                             * Creates a new ChunkedDocument instance using the specified properties.
+                             * @function create
+                             * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                             * @static
+                             * @param {google.cloud.documentai.v1.Document.IChunkedDocument=} [properties] Properties to set
+                             * @returns {google.cloud.documentai.v1.Document.ChunkedDocument} ChunkedDocument instance
+                             */
+                            ChunkedDocument.create = function create(properties) {
+                                return new ChunkedDocument(properties);
+                            };
+    
+                            /**
+                             * Encodes the specified ChunkedDocument message. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.verify|verify} messages.
+                             * @function encode
+                             * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                             * @static
+                             * @param {google.cloud.documentai.v1.Document.IChunkedDocument} message ChunkedDocument message or plain object to encode
+                             * @param {$protobuf.Writer} [writer] Writer to encode to
+                             * @returns {$protobuf.Writer} Writer
+                             */
+                            ChunkedDocument.encode = function encode(message, writer) {
+                                if (!writer)
+                                    writer = $Writer.create();
+                                if (message.chunks != null && message.chunks.length)
+                                    for (var i = 0; i < message.chunks.length; ++i)
+                                        $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.encode(message.chunks[i], writer.uint32(/* id 1, wireType 2 =*/10).fork()).ldelim();
+                                return writer;
+                            };
+    
+                            /**
+                             * Encodes the specified ChunkedDocument message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.verify|verify} messages.
+                             * @function encodeDelimited
+                             * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                             * @static
+                             * @param {google.cloud.documentai.v1.Document.IChunkedDocument} message ChunkedDocument message or plain object to encode
+                             * @param {$protobuf.Writer} [writer] Writer to encode to
+                             * @returns {$protobuf.Writer} Writer
+                             */
+                            ChunkedDocument.encodeDelimited = function encodeDelimited(message, writer) {
+                                return this.encode(message, writer).ldelim();
+                            };
+    
+                            /**
+                             * Decodes a ChunkedDocument message from the specified reader or buffer.
+                             * @function decode
+                             * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                             * @static
+                             * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                             * @param {number} [length] Message length if known beforehand
+                             * @returns {google.cloud.documentai.v1.Document.ChunkedDocument} ChunkedDocument
+                             * @throws {Error} If the payload is not a reader or valid buffer
+                             * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                             */
+                            ChunkedDocument.decode = function decode(reader, length) {
+                                if (!(reader instanceof $Reader))
+                                    reader = $Reader.create(reader);
+                                var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.ChunkedDocument();
+                                while (reader.pos < end) {
+                                    var tag = reader.uint32();
+                                    switch (tag >>> 3) {
+                                    case 1: {
+                                            if (!(message.chunks && message.chunks.length))
+                                                message.chunks = [];
+                                            message.chunks.push($root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.decode(reader, reader.uint32()));
+                                            break;
+                                        }
+                                    default:
+                                        reader.skipType(tag & 7);
+                                        break;
+                                    }
+                                }
+                                return message;
+                            };
+    
+                            /**
+                             * Decodes a ChunkedDocument message from the specified reader or buffer, length delimited.
+                             * @function decodeDelimited
+                             * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                             * @static
+                             * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                             * @returns {google.cloud.documentai.v1.Document.ChunkedDocument} ChunkedDocument
+                             * @throws {Error} If the payload is not a reader or valid buffer
+                             * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                             */
+                            ChunkedDocument.decodeDelimited = function decodeDelimited(reader) {
+                                if (!(reader instanceof $Reader))
+                                    reader = new $Reader(reader);
+                                return this.decode(reader, reader.uint32());
+                            };
+    
+                            /**
+                             * Verifies a ChunkedDocument message.
+                             * @function verify
+                             * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                             * @static
+                             * @param {Object.<string,*>} message Plain object to verify
+                             * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                             */
+                            ChunkedDocument.verify = function verify(message) {
+                                if (typeof message !== "object" || message === null)
+                                    return "object expected";
+                                if (message.chunks != null && message.hasOwnProperty("chunks")) {
+                                    if (!Array.isArray(message.chunks))
+                                        return "chunks: array expected";
+                                    for (var i = 0; i < message.chunks.length; ++i) {
+                                        var error = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.verify(message.chunks[i]);
+                                        if (error)
+                                            return "chunks." + error;
+                                    }
+                                }
+                                return null;
+                            };
+    
+                            /**
+                             * Creates a ChunkedDocument message from a plain object. Also converts values to their respective internal types.
+                             * @function fromObject
+                             * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                             * @static
+                             * @param {Object.<string,*>} object Plain object
+                             * @returns {google.cloud.documentai.v1.Document.ChunkedDocument} ChunkedDocument
+                             */
+                            ChunkedDocument.fromObject = function fromObject(object) {
+                                if (object instanceof $root.google.cloud.documentai.v1.Document.ChunkedDocument)
+                                    return object;
+                                var message = new $root.google.cloud.documentai.v1.Document.ChunkedDocument();
+                                if (object.chunks) {
+                                    if (!Array.isArray(object.chunks))
+                                        throw TypeError(".google.cloud.documentai.v1.Document.ChunkedDocument.chunks: array expected");
+                                    message.chunks = [];
+                                    for (var i = 0; i < object.chunks.length; ++i) {
+                                        if (typeof object.chunks[i] !== "object")
+                                            throw TypeError(".google.cloud.documentai.v1.Document.ChunkedDocument.chunks: object expected");
+                                        message.chunks[i] = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.fromObject(object.chunks[i]);
+                                    }
+                                }
+                                return message;
+                            };
+    
+                            /**
+                             * Creates a plain object from a ChunkedDocument message. Also converts values to other types if specified.
+                             * @function toObject
+                             * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                             * @static
+                             * @param {google.cloud.documentai.v1.Document.ChunkedDocument} message ChunkedDocument
+                             * @param {$protobuf.IConversionOptions} [options] Conversion options
+                             * @returns {Object.<string,*>} Plain object
+                             */
+                            ChunkedDocument.toObject = function toObject(message, options) {
+                                if (!options)
+                                    options = {};
+                                var object = {};
+                                if (options.arrays || options.defaults)
+                                    object.chunks = [];
+                                if (message.chunks && message.chunks.length) {
+                                    object.chunks = [];
+                                    for (var j = 0; j < message.chunks.length; ++j)
+                                        object.chunks[j] = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.toObject(message.chunks[j], options);
+                                }
+                                return object;
+                            };
+    
+                            /**
+                             * Converts this ChunkedDocument to JSON.
+                             * @function toJSON
+                             * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                             * @instance
+                             * @returns {Object.<string,*>} JSON object
+                             */
+                            ChunkedDocument.prototype.toJSON = function toJSON() {
+                                return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                            };
+    
+                            /**
+                             * Gets the default type url for ChunkedDocument
+                             * @function getTypeUrl
+                             * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                             * @static
+                             * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                             * @returns {string} The default type url
+                             */
+                            ChunkedDocument.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                if (typeUrlPrefix === undefined) {
+                                    typeUrlPrefix = "type.googleapis.com";
+                                }
+                                return typeUrlPrefix + "/google.cloud.documentai.v1.Document.ChunkedDocument";
+                            };
+    
+                            ChunkedDocument.Chunk = (function() {
+    
+                                /**
+                                 * Properties of a Chunk.
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                                 * @interface IChunk
+                                 * @property {string|null} [chunkId] Chunk chunkId
+                                 * @property {Array.<string>|null} [sourceBlockIds] Chunk sourceBlockIds
+                                 * @property {string|null} [content] Chunk content
+                                 * @property {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null} [pageSpan] Chunk pageSpan
+                                 * @property {Array.<google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader>|null} [pageHeaders] Chunk pageHeaders
+                                 * @property {Array.<google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter>|null} [pageFooters] Chunk pageFooters
+                                 */
+    
+                                /**
+                                 * Constructs a new Chunk.
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument
+                                 * @classdesc Represents a Chunk.
+                                 * @implements IChunk
+                                 * @constructor
+                                 * @param {google.cloud.documentai.v1.Document.ChunkedDocument.IChunk=} [properties] Properties to set
+                                 */
+                                function Chunk(properties) {
+                                    this.sourceBlockIds = [];
+                                    this.pageHeaders = [];
+                                    this.pageFooters = [];
+                                    if (properties)
+                                        for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                            if (properties[keys[i]] != null)
+                                                this[keys[i]] = properties[keys[i]];
+                                }
+    
+                                /**
+                                 * Chunk chunkId.
+                                 * @member {string} chunkId
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @instance
+                                 */
+                                Chunk.prototype.chunkId = "";
+    
+                                /**
+                                 * Chunk sourceBlockIds.
+                                 * @member {Array.<string>} sourceBlockIds
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @instance
+                                 */
+                                Chunk.prototype.sourceBlockIds = $util.emptyArray;
+    
+                                /**
+                                 * Chunk content.
+                                 * @member {string} content
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @instance
+                                 */
+                                Chunk.prototype.content = "";
+    
+                                /**
+                                 * Chunk pageSpan.
+                                 * @member {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null|undefined} pageSpan
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @instance
+                                 */
+                                Chunk.prototype.pageSpan = null;
+    
+                                /**
+                                 * Chunk pageHeaders.
+                                 * @member {Array.<google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader>} pageHeaders
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @instance
+                                 */
+                                Chunk.prototype.pageHeaders = $util.emptyArray;
+    
+                                /**
+                                 * Chunk pageFooters.
+                                 * @member {Array.<google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter>} pageFooters
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @instance
+                                 */
+                                Chunk.prototype.pageFooters = $util.emptyArray;
+    
+                                /**
+                                 * Creates a new Chunk instance using the specified properties.
+                                 * @function create
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @static
+                                 * @param {google.cloud.documentai.v1.Document.ChunkedDocument.IChunk=} [properties] Properties to set
+                                 * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk} Chunk instance
+                                 */
+                                Chunk.create = function create(properties) {
+                                    return new Chunk(properties);
+                                };
+    
+                                /**
+                                 * Encodes the specified Chunk message. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.verify|verify} messages.
+                                 * @function encode
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @static
+                                 * @param {google.cloud.documentai.v1.Document.ChunkedDocument.IChunk} message Chunk message or plain object to encode
+                                 * @param {$protobuf.Writer} [writer] Writer to encode to
+                                 * @returns {$protobuf.Writer} Writer
+                                 */
+                                Chunk.encode = function encode(message, writer) {
+                                    if (!writer)
+                                        writer = $Writer.create();
+                                    if (message.chunkId != null && Object.hasOwnProperty.call(message, "chunkId"))
+                                        writer.uint32(/* id 1, wireType 2 =*/10).string(message.chunkId);
+                                    if (message.sourceBlockIds != null && message.sourceBlockIds.length)
+                                        for (var i = 0; i < message.sourceBlockIds.length; ++i)
+                                            writer.uint32(/* id 2, wireType 2 =*/18).string(message.sourceBlockIds[i]);
+                                    if (message.content != null && Object.hasOwnProperty.call(message, "content"))
+                                        writer.uint32(/* id 3, wireType 2 =*/26).string(message.content);
+                                    if (message.pageSpan != null && Object.hasOwnProperty.call(message, "pageSpan"))
+                                        $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.encode(message.pageSpan, writer.uint32(/* id 4, wireType 2 =*/34).fork()).ldelim();
+                                    if (message.pageHeaders != null && message.pageHeaders.length)
+                                        for (var i = 0; i < message.pageHeaders.length; ++i)
+                                            $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader.encode(message.pageHeaders[i], writer.uint32(/* id 5, wireType 2 =*/42).fork()).ldelim();
+                                    if (message.pageFooters != null && message.pageFooters.length)
+                                        for (var i = 0; i < message.pageFooters.length; ++i)
+                                            $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter.encode(message.pageFooters[i], writer.uint32(/* id 6, wireType 2 =*/50).fork()).ldelim();
+                                    return writer;
+                                };
+    
+                                /**
+                                 * Encodes the specified Chunk message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.verify|verify} messages.
+                                 * @function encodeDelimited
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @static
+                                 * @param {google.cloud.documentai.v1.Document.ChunkedDocument.IChunk} message Chunk message or plain object to encode
+                                 * @param {$protobuf.Writer} [writer] Writer to encode to
+                                 * @returns {$protobuf.Writer} Writer
+                                 */
+                                Chunk.encodeDelimited = function encodeDelimited(message, writer) {
+                                    return this.encode(message, writer).ldelim();
+                                };
+    
+                                /**
+                                 * Decodes a Chunk message from the specified reader or buffer.
+                                 * @function decode
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @static
+                                 * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                 * @param {number} [length] Message length if known beforehand
+                                 * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk} Chunk
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                Chunk.decode = function decode(reader, length) {
+                                    if (!(reader instanceof $Reader))
+                                        reader = $Reader.create(reader);
+                                    var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk();
+                                    while (reader.pos < end) {
+                                        var tag = reader.uint32();
+                                        switch (tag >>> 3) {
+                                        case 1: {
+                                                message.chunkId = reader.string();
+                                                break;
+                                            }
+                                        case 2: {
+                                                if (!(message.sourceBlockIds && message.sourceBlockIds.length))
+                                                    message.sourceBlockIds = [];
+                                                message.sourceBlockIds.push(reader.string());
+                                                break;
+                                            }
+                                        case 3: {
+                                                message.content = reader.string();
+                                                break;
+                                            }
+                                        case 4: {
+                                                message.pageSpan = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.decode(reader, reader.uint32());
+                                                break;
+                                            }
+                                        case 5: {
+                                                if (!(message.pageHeaders && message.pageHeaders.length))
+                                                    message.pageHeaders = [];
+                                                message.pageHeaders.push($root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader.decode(reader, reader.uint32()));
+                                                break;
+                                            }
+                                        case 6: {
+                                                if (!(message.pageFooters && message.pageFooters.length))
+                                                    message.pageFooters = [];
+                                                message.pageFooters.push($root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter.decode(reader, reader.uint32()));
+                                                break;
+                                            }
+                                        default:
+                                            reader.skipType(tag & 7);
+                                            break;
+                                        }
+                                    }
+                                    return message;
+                                };
+    
+                                /**
+                                 * Decodes a Chunk message from the specified reader or buffer, length delimited.
+                                 * @function decodeDelimited
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @static
+                                 * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                 * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk} Chunk
+                                 * @throws {Error} If the payload is not a reader or valid buffer
+                                 * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                 */
+                                Chunk.decodeDelimited = function decodeDelimited(reader) {
+                                    if (!(reader instanceof $Reader))
+                                        reader = new $Reader(reader);
+                                    return this.decode(reader, reader.uint32());
+                                };
+    
+                                /**
+                                 * Verifies a Chunk message.
+                                 * @function verify
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @static
+                                 * @param {Object.<string,*>} message Plain object to verify
+                                 * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                 */
+                                Chunk.verify = function verify(message) {
+                                    if (typeof message !== "object" || message === null)
+                                        return "object expected";
+                                    if (message.chunkId != null && message.hasOwnProperty("chunkId"))
+                                        if (!$util.isString(message.chunkId))
+                                            return "chunkId: string expected";
+                                    if (message.sourceBlockIds != null && message.hasOwnProperty("sourceBlockIds")) {
+                                        if (!Array.isArray(message.sourceBlockIds))
+                                            return "sourceBlockIds: array expected";
+                                        for (var i = 0; i < message.sourceBlockIds.length; ++i)
+                                            if (!$util.isString(message.sourceBlockIds[i]))
+                                                return "sourceBlockIds: string[] expected";
+                                    }
+                                    if (message.content != null && message.hasOwnProperty("content"))
+                                        if (!$util.isString(message.content))
+                                            return "content: string expected";
+                                    if (message.pageSpan != null && message.hasOwnProperty("pageSpan")) {
+                                        var error = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.verify(message.pageSpan);
+                                        if (error)
+                                            return "pageSpan." + error;
+                                    }
+                                    if (message.pageHeaders != null && message.hasOwnProperty("pageHeaders")) {
+                                        if (!Array.isArray(message.pageHeaders))
+                                            return "pageHeaders: array expected";
+                                        for (var i = 0; i < message.pageHeaders.length; ++i) {
+                                            var error = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader.verify(message.pageHeaders[i]);
+                                            if (error)
+                                                return "pageHeaders." + error;
+                                        }
+                                    }
+                                    if (message.pageFooters != null && message.hasOwnProperty("pageFooters")) {
+                                        if (!Array.isArray(message.pageFooters))
+                                            return "pageFooters: array expected";
+                                        for (var i = 0; i < message.pageFooters.length; ++i) {
+                                            var error = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter.verify(message.pageFooters[i]);
+                                            if (error)
+                                                return "pageFooters." + error;
+                                        }
+                                    }
+                                    return null;
+                                };
+    
+                                /**
+                                 * Creates a Chunk message from a plain object. Also converts values to their respective internal types.
+                                 * @function fromObject
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @static
+                                 * @param {Object.<string,*>} object Plain object
+                                 * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk} Chunk
+                                 */
+                                Chunk.fromObject = function fromObject(object) {
+                                    if (object instanceof $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk)
+                                        return object;
+                                    var message = new $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk();
+                                    if (object.chunkId != null)
+                                        message.chunkId = String(object.chunkId);
+                                    if (object.sourceBlockIds) {
+                                        if (!Array.isArray(object.sourceBlockIds))
+                                            throw TypeError(".google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.sourceBlockIds: array expected");
+                                        message.sourceBlockIds = [];
+                                        for (var i = 0; i < object.sourceBlockIds.length; ++i)
+                                            message.sourceBlockIds[i] = String(object.sourceBlockIds[i]);
+                                    }
+                                    if (object.content != null)
+                                        message.content = String(object.content);
+                                    if (object.pageSpan != null) {
+                                        if (typeof object.pageSpan !== "object")
+                                            throw TypeError(".google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.pageSpan: object expected");
+                                        message.pageSpan = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.fromObject(object.pageSpan);
+                                    }
+                                    if (object.pageHeaders) {
+                                        if (!Array.isArray(object.pageHeaders))
+                                            throw TypeError(".google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.pageHeaders: array expected");
+                                        message.pageHeaders = [];
+                                        for (var i = 0; i < object.pageHeaders.length; ++i) {
+                                            if (typeof object.pageHeaders[i] !== "object")
+                                                throw TypeError(".google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.pageHeaders: object expected");
+                                            message.pageHeaders[i] = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader.fromObject(object.pageHeaders[i]);
+                                        }
+                                    }
+                                    if (object.pageFooters) {
+                                        if (!Array.isArray(object.pageFooters))
+                                            throw TypeError(".google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.pageFooters: array expected");
+                                        message.pageFooters = [];
+                                        for (var i = 0; i < object.pageFooters.length; ++i) {
+                                            if (typeof object.pageFooters[i] !== "object")
+                                                throw TypeError(".google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.pageFooters: object expected");
+                                            message.pageFooters[i] = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter.fromObject(object.pageFooters[i]);
+                                        }
+                                    }
+                                    return message;
+                                };
+    
+                                /**
+                                 * Creates a plain object from a Chunk message. Also converts values to other types if specified.
+                                 * @function toObject
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @static
+                                 * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk} message Chunk
+                                 * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                 * @returns {Object.<string,*>} Plain object
+                                 */
+                                Chunk.toObject = function toObject(message, options) {
+                                    if (!options)
+                                        options = {};
+                                    var object = {};
+                                    if (options.arrays || options.defaults) {
+                                        object.sourceBlockIds = [];
+                                        object.pageHeaders = [];
+                                        object.pageFooters = [];
+                                    }
+                                    if (options.defaults) {
+                                        object.chunkId = "";
+                                        object.content = "";
+                                        object.pageSpan = null;
+                                    }
+                                    if (message.chunkId != null && message.hasOwnProperty("chunkId"))
+                                        object.chunkId = message.chunkId;
+                                    if (message.sourceBlockIds && message.sourceBlockIds.length) {
+                                        object.sourceBlockIds = [];
+                                        for (var j = 0; j < message.sourceBlockIds.length; ++j)
+                                            object.sourceBlockIds[j] = message.sourceBlockIds[j];
+                                    }
+                                    if (message.content != null && message.hasOwnProperty("content"))
+                                        object.content = message.content;
+                                    if (message.pageSpan != null && message.hasOwnProperty("pageSpan"))
+                                        object.pageSpan = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.toObject(message.pageSpan, options);
+                                    if (message.pageHeaders && message.pageHeaders.length) {
+                                        object.pageHeaders = [];
+                                        for (var j = 0; j < message.pageHeaders.length; ++j)
+                                            object.pageHeaders[j] = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader.toObject(message.pageHeaders[j], options);
+                                    }
+                                    if (message.pageFooters && message.pageFooters.length) {
+                                        object.pageFooters = [];
+                                        for (var j = 0; j < message.pageFooters.length; ++j)
+                                            object.pageFooters[j] = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter.toObject(message.pageFooters[j], options);
+                                    }
+                                    return object;
+                                };
+    
+                                /**
+                                 * Converts this Chunk to JSON.
+                                 * @function toJSON
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @instance
+                                 * @returns {Object.<string,*>} JSON object
+                                 */
+                                Chunk.prototype.toJSON = function toJSON() {
+                                    return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                };
+    
+                                /**
+                                 * Gets the default type url for Chunk
+                                 * @function getTypeUrl
+                                 * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                 * @static
+                                 * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                 * @returns {string} The default type url
+                                 */
+                                Chunk.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                    if (typeUrlPrefix === undefined) {
+                                        typeUrlPrefix = "type.googleapis.com";
+                                    }
+                                    return typeUrlPrefix + "/google.cloud.documentai.v1.Document.ChunkedDocument.Chunk";
+                                };
+    
+                                Chunk.ChunkPageSpan = (function() {
+    
+                                    /**
+                                     * Properties of a ChunkPageSpan.
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                     * @interface IChunkPageSpan
+                                     * @property {number|null} [pageStart] ChunkPageSpan pageStart
+                                     * @property {number|null} [pageEnd] ChunkPageSpan pageEnd
+                                     */
+    
+                                    /**
+                                     * Constructs a new ChunkPageSpan.
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                     * @classdesc Represents a ChunkPageSpan.
+                                     * @implements IChunkPageSpan
+                                     * @constructor
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan=} [properties] Properties to set
+                                     */
+                                    function ChunkPageSpan(properties) {
+                                        if (properties)
+                                            for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                                if (properties[keys[i]] != null)
+                                                    this[keys[i]] = properties[keys[i]];
+                                    }
+    
+                                    /**
+                                     * ChunkPageSpan pageStart.
+                                     * @member {number} pageStart
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @instance
+                                     */
+                                    ChunkPageSpan.prototype.pageStart = 0;
+    
+                                    /**
+                                     * ChunkPageSpan pageEnd.
+                                     * @member {number} pageEnd
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @instance
+                                     */
+                                    ChunkPageSpan.prototype.pageEnd = 0;
+    
+                                    /**
+                                     * Creates a new ChunkPageSpan instance using the specified properties.
+                                     * @function create
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan=} [properties] Properties to set
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan} ChunkPageSpan instance
+                                     */
+                                    ChunkPageSpan.create = function create(properties) {
+                                        return new ChunkPageSpan(properties);
+                                    };
+    
+                                    /**
+                                     * Encodes the specified ChunkPageSpan message. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.verify|verify} messages.
+                                     * @function encode
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan} message ChunkPageSpan message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    ChunkPageSpan.encode = function encode(message, writer) {
+                                        if (!writer)
+                                            writer = $Writer.create();
+                                        if (message.pageStart != null && Object.hasOwnProperty.call(message, "pageStart"))
+                                            writer.uint32(/* id 1, wireType 0 =*/8).int32(message.pageStart);
+                                        if (message.pageEnd != null && Object.hasOwnProperty.call(message, "pageEnd"))
+                                            writer.uint32(/* id 2, wireType 0 =*/16).int32(message.pageEnd);
+                                        return writer;
+                                    };
+    
+                                    /**
+                                     * Encodes the specified ChunkPageSpan message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.verify|verify} messages.
+                                     * @function encodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan} message ChunkPageSpan message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    ChunkPageSpan.encodeDelimited = function encodeDelimited(message, writer) {
+                                        return this.encode(message, writer).ldelim();
+                                    };
+    
+                                    /**
+                                     * Decodes a ChunkPageSpan message from the specified reader or buffer.
+                                     * @function decode
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @param {number} [length] Message length if known beforehand
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan} ChunkPageSpan
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    ChunkPageSpan.decode = function decode(reader, length) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = $Reader.create(reader);
+                                        var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan();
+                                        while (reader.pos < end) {
+                                            var tag = reader.uint32();
+                                            switch (tag >>> 3) {
+                                            case 1: {
+                                                    message.pageStart = reader.int32();
+                                                    break;
+                                                }
+                                            case 2: {
+                                                    message.pageEnd = reader.int32();
+                                                    break;
+                                                }
+                                            default:
+                                                reader.skipType(tag & 7);
+                                                break;
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Decodes a ChunkPageSpan message from the specified reader or buffer, length delimited.
+                                     * @function decodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan} ChunkPageSpan
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    ChunkPageSpan.decodeDelimited = function decodeDelimited(reader) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = new $Reader(reader);
+                                        return this.decode(reader, reader.uint32());
+                                    };
+    
+                                    /**
+                                     * Verifies a ChunkPageSpan message.
+                                     * @function verify
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @static
+                                     * @param {Object.<string,*>} message Plain object to verify
+                                     * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                     */
+                                    ChunkPageSpan.verify = function verify(message) {
+                                        if (typeof message !== "object" || message === null)
+                                            return "object expected";
+                                        if (message.pageStart != null && message.hasOwnProperty("pageStart"))
+                                            if (!$util.isInteger(message.pageStart))
+                                                return "pageStart: integer expected";
+                                        if (message.pageEnd != null && message.hasOwnProperty("pageEnd"))
+                                            if (!$util.isInteger(message.pageEnd))
+                                                return "pageEnd: integer expected";
+                                        return null;
+                                    };
+    
+                                    /**
+                                     * Creates a ChunkPageSpan message from a plain object. Also converts values to their respective internal types.
+                                     * @function fromObject
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @static
+                                     * @param {Object.<string,*>} object Plain object
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan} ChunkPageSpan
+                                     */
+                                    ChunkPageSpan.fromObject = function fromObject(object) {
+                                        if (object instanceof $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan)
+                                            return object;
+                                        var message = new $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan();
+                                        if (object.pageStart != null)
+                                            message.pageStart = object.pageStart | 0;
+                                        if (object.pageEnd != null)
+                                            message.pageEnd = object.pageEnd | 0;
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Creates a plain object from a ChunkPageSpan message. Also converts values to other types if specified.
+                                     * @function toObject
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan} message ChunkPageSpan
+                                     * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                     * @returns {Object.<string,*>} Plain object
+                                     */
+                                    ChunkPageSpan.toObject = function toObject(message, options) {
+                                        if (!options)
+                                            options = {};
+                                        var object = {};
+                                        if (options.defaults) {
+                                            object.pageStart = 0;
+                                            object.pageEnd = 0;
+                                        }
+                                        if (message.pageStart != null && message.hasOwnProperty("pageStart"))
+                                            object.pageStart = message.pageStart;
+                                        if (message.pageEnd != null && message.hasOwnProperty("pageEnd"))
+                                            object.pageEnd = message.pageEnd;
+                                        return object;
+                                    };
+    
+                                    /**
+                                     * Converts this ChunkPageSpan to JSON.
+                                     * @function toJSON
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @instance
+                                     * @returns {Object.<string,*>} JSON object
+                                     */
+                                    ChunkPageSpan.prototype.toJSON = function toJSON() {
+                                        return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                    };
+    
+                                    /**
+                                     * Gets the default type url for ChunkPageSpan
+                                     * @function getTypeUrl
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan
+                                     * @static
+                                     * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                     * @returns {string} The default type url
+                                     */
+                                    ChunkPageSpan.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                        if (typeUrlPrefix === undefined) {
+                                            typeUrlPrefix = "type.googleapis.com";
+                                        }
+                                        return typeUrlPrefix + "/google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan";
+                                    };
+    
+                                    return ChunkPageSpan;
+                                })();
+    
+                                Chunk.ChunkPageHeader = (function() {
+    
+                                    /**
+                                     * Properties of a ChunkPageHeader.
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                     * @interface IChunkPageHeader
+                                     * @property {string|null} [text] ChunkPageHeader text
+                                     * @property {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null} [pageSpan] ChunkPageHeader pageSpan
+                                     */
+    
+                                    /**
+                                     * Constructs a new ChunkPageHeader.
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                     * @classdesc Represents a ChunkPageHeader.
+                                     * @implements IChunkPageHeader
+                                     * @constructor
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader=} [properties] Properties to set
+                                     */
+                                    function ChunkPageHeader(properties) {
+                                        if (properties)
+                                            for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                                if (properties[keys[i]] != null)
+                                                    this[keys[i]] = properties[keys[i]];
+                                    }
+    
+                                    /**
+                                     * ChunkPageHeader text.
+                                     * @member {string} text
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @instance
+                                     */
+                                    ChunkPageHeader.prototype.text = "";
+    
+                                    /**
+                                     * ChunkPageHeader pageSpan.
+                                     * @member {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null|undefined} pageSpan
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @instance
+                                     */
+                                    ChunkPageHeader.prototype.pageSpan = null;
+    
+                                    /**
+                                     * Creates a new ChunkPageHeader instance using the specified properties.
+                                     * @function create
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader=} [properties] Properties to set
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader} ChunkPageHeader instance
+                                     */
+                                    ChunkPageHeader.create = function create(properties) {
+                                        return new ChunkPageHeader(properties);
+                                    };
+    
+                                    /**
+                                     * Encodes the specified ChunkPageHeader message. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader.verify|verify} messages.
+                                     * @function encode
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader} message ChunkPageHeader message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    ChunkPageHeader.encode = function encode(message, writer) {
+                                        if (!writer)
+                                            writer = $Writer.create();
+                                        if (message.text != null && Object.hasOwnProperty.call(message, "text"))
+                                            writer.uint32(/* id 1, wireType 2 =*/10).string(message.text);
+                                        if (message.pageSpan != null && Object.hasOwnProperty.call(message, "pageSpan"))
+                                            $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.encode(message.pageSpan, writer.uint32(/* id 2, wireType 2 =*/18).fork()).ldelim();
+                                        return writer;
+                                    };
+    
+                                    /**
+                                     * Encodes the specified ChunkPageHeader message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader.verify|verify} messages.
+                                     * @function encodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageHeader} message ChunkPageHeader message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    ChunkPageHeader.encodeDelimited = function encodeDelimited(message, writer) {
+                                        return this.encode(message, writer).ldelim();
+                                    };
+    
+                                    /**
+                                     * Decodes a ChunkPageHeader message from the specified reader or buffer.
+                                     * @function decode
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @param {number} [length] Message length if known beforehand
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader} ChunkPageHeader
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    ChunkPageHeader.decode = function decode(reader, length) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = $Reader.create(reader);
+                                        var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader();
+                                        while (reader.pos < end) {
+                                            var tag = reader.uint32();
+                                            switch (tag >>> 3) {
+                                            case 1: {
+                                                    message.text = reader.string();
+                                                    break;
+                                                }
+                                            case 2: {
+                                                    message.pageSpan = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.decode(reader, reader.uint32());
+                                                    break;
+                                                }
+                                            default:
+                                                reader.skipType(tag & 7);
+                                                break;
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Decodes a ChunkPageHeader message from the specified reader or buffer, length delimited.
+                                     * @function decodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader} ChunkPageHeader
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    ChunkPageHeader.decodeDelimited = function decodeDelimited(reader) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = new $Reader(reader);
+                                        return this.decode(reader, reader.uint32());
+                                    };
+    
+                                    /**
+                                     * Verifies a ChunkPageHeader message.
+                                     * @function verify
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @static
+                                     * @param {Object.<string,*>} message Plain object to verify
+                                     * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                     */
+                                    ChunkPageHeader.verify = function verify(message) {
+                                        if (typeof message !== "object" || message === null)
+                                            return "object expected";
+                                        if (message.text != null && message.hasOwnProperty("text"))
+                                            if (!$util.isString(message.text))
+                                                return "text: string expected";
+                                        if (message.pageSpan != null && message.hasOwnProperty("pageSpan")) {
+                                            var error = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.verify(message.pageSpan);
+                                            if (error)
+                                                return "pageSpan." + error;
+                                        }
+                                        return null;
+                                    };
+    
+                                    /**
+                                     * Creates a ChunkPageHeader message from a plain object. Also converts values to their respective internal types.
+                                     * @function fromObject
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @static
+                                     * @param {Object.<string,*>} object Plain object
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader} ChunkPageHeader
+                                     */
+                                    ChunkPageHeader.fromObject = function fromObject(object) {
+                                        if (object instanceof $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader)
+                                            return object;
+                                        var message = new $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader();
+                                        if (object.text != null)
+                                            message.text = String(object.text);
+                                        if (object.pageSpan != null) {
+                                            if (typeof object.pageSpan !== "object")
+                                                throw TypeError(".google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader.pageSpan: object expected");
+                                            message.pageSpan = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.fromObject(object.pageSpan);
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Creates a plain object from a ChunkPageHeader message. Also converts values to other types if specified.
+                                     * @function toObject
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader} message ChunkPageHeader
+                                     * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                     * @returns {Object.<string,*>} Plain object
+                                     */
+                                    ChunkPageHeader.toObject = function toObject(message, options) {
+                                        if (!options)
+                                            options = {};
+                                        var object = {};
+                                        if (options.defaults) {
+                                            object.text = "";
+                                            object.pageSpan = null;
+                                        }
+                                        if (message.text != null && message.hasOwnProperty("text"))
+                                            object.text = message.text;
+                                        if (message.pageSpan != null && message.hasOwnProperty("pageSpan"))
+                                            object.pageSpan = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.toObject(message.pageSpan, options);
+                                        return object;
+                                    };
+    
+                                    /**
+                                     * Converts this ChunkPageHeader to JSON.
+                                     * @function toJSON
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @instance
+                                     * @returns {Object.<string,*>} JSON object
+                                     */
+                                    ChunkPageHeader.prototype.toJSON = function toJSON() {
+                                        return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                    };
+    
+                                    /**
+                                     * Gets the default type url for ChunkPageHeader
+                                     * @function getTypeUrl
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader
+                                     * @static
+                                     * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                     * @returns {string} The default type url
+                                     */
+                                    ChunkPageHeader.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                        if (typeUrlPrefix === undefined) {
+                                            typeUrlPrefix = "type.googleapis.com";
+                                        }
+                                        return typeUrlPrefix + "/google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageHeader";
+                                    };
+    
+                                    return ChunkPageHeader;
+                                })();
+    
+                                Chunk.ChunkPageFooter = (function() {
+    
+                                    /**
+                                     * Properties of a ChunkPageFooter.
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                     * @interface IChunkPageFooter
+                                     * @property {string|null} [text] ChunkPageFooter text
+                                     * @property {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null} [pageSpan] ChunkPageFooter pageSpan
+                                     */
+    
+                                    /**
+                                     * Constructs a new ChunkPageFooter.
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk
+                                     * @classdesc Represents a ChunkPageFooter.
+                                     * @implements IChunkPageFooter
+                                     * @constructor
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter=} [properties] Properties to set
+                                     */
+                                    function ChunkPageFooter(properties) {
+                                        if (properties)
+                                            for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
+                                                if (properties[keys[i]] != null)
+                                                    this[keys[i]] = properties[keys[i]];
+                                    }
+    
+                                    /**
+                                     * ChunkPageFooter text.
+                                     * @member {string} text
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @instance
+                                     */
+                                    ChunkPageFooter.prototype.text = "";
+    
+                                    /**
+                                     * ChunkPageFooter pageSpan.
+                                     * @member {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageSpan|null|undefined} pageSpan
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @instance
+                                     */
+                                    ChunkPageFooter.prototype.pageSpan = null;
+    
+                                    /**
+                                     * Creates a new ChunkPageFooter instance using the specified properties.
+                                     * @function create
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter=} [properties] Properties to set
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter} ChunkPageFooter instance
+                                     */
+                                    ChunkPageFooter.create = function create(properties) {
+                                        return new ChunkPageFooter(properties);
+                                    };
+    
+                                    /**
+                                     * Encodes the specified ChunkPageFooter message. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter.verify|verify} messages.
+                                     * @function encode
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter} message ChunkPageFooter message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    ChunkPageFooter.encode = function encode(message, writer) {
+                                        if (!writer)
+                                            writer = $Writer.create();
+                                        if (message.text != null && Object.hasOwnProperty.call(message, "text"))
+                                            writer.uint32(/* id 1, wireType 2 =*/10).string(message.text);
+                                        if (message.pageSpan != null && Object.hasOwnProperty.call(message, "pageSpan"))
+                                            $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.encode(message.pageSpan, writer.uint32(/* id 2, wireType 2 =*/18).fork()).ldelim();
+                                        return writer;
+                                    };
+    
+                                    /**
+                                     * Encodes the specified ChunkPageFooter message, length delimited. Does not implicitly {@link google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter.verify|verify} messages.
+                                     * @function encodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.IChunkPageFooter} message ChunkPageFooter message or plain object to encode
+                                     * @param {$protobuf.Writer} [writer] Writer to encode to
+                                     * @returns {$protobuf.Writer} Writer
+                                     */
+                                    ChunkPageFooter.encodeDelimited = function encodeDelimited(message, writer) {
+                                        return this.encode(message, writer).ldelim();
+                                    };
+    
+                                    /**
+                                     * Decodes a ChunkPageFooter message from the specified reader or buffer.
+                                     * @function decode
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @param {number} [length] Message length if known beforehand
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter} ChunkPageFooter
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    ChunkPageFooter.decode = function decode(reader, length) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = $Reader.create(reader);
+                                        var end = length === undefined ? reader.len : reader.pos + length, message = new $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter();
+                                        while (reader.pos < end) {
+                                            var tag = reader.uint32();
+                                            switch (tag >>> 3) {
+                                            case 1: {
+                                                    message.text = reader.string();
+                                                    break;
+                                                }
+                                            case 2: {
+                                                    message.pageSpan = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.decode(reader, reader.uint32());
+                                                    break;
+                                                }
+                                            default:
+                                                reader.skipType(tag & 7);
+                                                break;
+                                            }
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Decodes a ChunkPageFooter message from the specified reader or buffer, length delimited.
+                                     * @function decodeDelimited
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @static
+                                     * @param {$protobuf.Reader|Uint8Array} reader Reader or buffer to decode from
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter} ChunkPageFooter
+                                     * @throws {Error} If the payload is not a reader or valid buffer
+                                     * @throws {$protobuf.util.ProtocolError} If required fields are missing
+                                     */
+                                    ChunkPageFooter.decodeDelimited = function decodeDelimited(reader) {
+                                        if (!(reader instanceof $Reader))
+                                            reader = new $Reader(reader);
+                                        return this.decode(reader, reader.uint32());
+                                    };
+    
+                                    /**
+                                     * Verifies a ChunkPageFooter message.
+                                     * @function verify
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @static
+                                     * @param {Object.<string,*>} message Plain object to verify
+                                     * @returns {string|null} `null` if valid, otherwise the reason why it is not
+                                     */
+                                    ChunkPageFooter.verify = function verify(message) {
+                                        if (typeof message !== "object" || message === null)
+                                            return "object expected";
+                                        if (message.text != null && message.hasOwnProperty("text"))
+                                            if (!$util.isString(message.text))
+                                                return "text: string expected";
+                                        if (message.pageSpan != null && message.hasOwnProperty("pageSpan")) {
+                                            var error = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.verify(message.pageSpan);
+                                            if (error)
+                                                return "pageSpan." + error;
+                                        }
+                                        return null;
+                                    };
+    
+                                    /**
+                                     * Creates a ChunkPageFooter message from a plain object. Also converts values to their respective internal types.
+                                     * @function fromObject
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @static
+                                     * @param {Object.<string,*>} object Plain object
+                                     * @returns {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter} ChunkPageFooter
+                                     */
+                                    ChunkPageFooter.fromObject = function fromObject(object) {
+                                        if (object instanceof $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter)
+                                            return object;
+                                        var message = new $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter();
+                                        if (object.text != null)
+                                            message.text = String(object.text);
+                                        if (object.pageSpan != null) {
+                                            if (typeof object.pageSpan !== "object")
+                                                throw TypeError(".google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter.pageSpan: object expected");
+                                            message.pageSpan = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.fromObject(object.pageSpan);
+                                        }
+                                        return message;
+                                    };
+    
+                                    /**
+                                     * Creates a plain object from a ChunkPageFooter message. Also converts values to other types if specified.
+                                     * @function toObject
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @static
+                                     * @param {google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter} message ChunkPageFooter
+                                     * @param {$protobuf.IConversionOptions} [options] Conversion options
+                                     * @returns {Object.<string,*>} Plain object
+                                     */
+                                    ChunkPageFooter.toObject = function toObject(message, options) {
+                                        if (!options)
+                                            options = {};
+                                        var object = {};
+                                        if (options.defaults) {
+                                            object.text = "";
+                                            object.pageSpan = null;
+                                        }
+                                        if (message.text != null && message.hasOwnProperty("text"))
+                                            object.text = message.text;
+                                        if (message.pageSpan != null && message.hasOwnProperty("pageSpan"))
+                                            object.pageSpan = $root.google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageSpan.toObject(message.pageSpan, options);
+                                        return object;
+                                    };
+    
+                                    /**
+                                     * Converts this ChunkPageFooter to JSON.
+                                     * @function toJSON
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @instance
+                                     * @returns {Object.<string,*>} JSON object
+                                     */
+                                    ChunkPageFooter.prototype.toJSON = function toJSON() {
+                                        return this.constructor.toObject(this, $protobuf.util.toJSONOptions);
+                                    };
+    
+                                    /**
+                                     * Gets the default type url for ChunkPageFooter
+                                     * @function getTypeUrl
+                                     * @memberof google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter
+                                     * @static
+                                     * @param {string} [typeUrlPrefix] your custom typeUrlPrefix(default "type.googleapis.com")
+                                     * @returns {string} The default type url
+                                     */
+                                    ChunkPageFooter.getTypeUrl = function getTypeUrl(typeUrlPrefix) {
+                                        if (typeUrlPrefix === undefined) {
+                                            typeUrlPrefix = "type.googleapis.com";
+                                        }
+                                        return typeUrlPrefix + "/google.cloud.documentai.v1.Document.ChunkedDocument.Chunk.ChunkPageFooter";
+                                    };
+    
+                                    return ChunkPageFooter;
+                                })();
+    
+                                return Chunk;
+                            })();
+    
+                            return ChunkedDocument;
+                        })();
+    
                         return Document;
                     })();
     
diff --git a/packages/google-cloud-contentwarehouse/protos/protos.json b/packages/google-cloud-contentwarehouse/protos/protos.json
index 72732cb3e79..fc996899dc9 100644
--- a/packages/google-cloud-contentwarehouse/protos/protos.json
+++ b/packages/google-cloud-contentwarehouse/protos/protos.json
@@ -3116,6 +3116,14 @@
                           "rule": "repeated",
                           "type": "Revision",
                           "id": 13
+                        },
+                        "documentLayout": {
+                          "type": "DocumentLayout",
+                          "id": 17
+                        },
+                        "chunkedDocument": {
+                          "type": "ChunkedDocument",
+                          "id": 18
                         }
                       },
                       "nested": {
@@ -4106,6 +4114,227 @@
                               }
                             }
                           }
+                        },
+                        "DocumentLayout": {
+                          "fields": {
+                            "blocks": {
+                              "rule": "repeated",
+                              "type": "DocumentLayoutBlock",
+                              "id": 1
+                            }
+                          },
+                          "nested": {
+                            "DocumentLayoutBlock": {
+                              "oneofs": {
+                                "block": {
+                                  "oneof": [
+                                    "textBlock",
+                                    "tableBlock",
+                                    "listBlock"
+                                  ]
+                                }
+                              },
+                              "fields": {
+                                "textBlock": {
+                                  "type": "LayoutTextBlock",
+                                  "id": 2
+                                },
+                                "tableBlock": {
+                                  "type": "LayoutTableBlock",
+                                  "id": 3
+                                },
+                                "listBlock": {
+                                  "type": "LayoutListBlock",
+                                  "id": 4
+                                },
+                                "blockId": {
+                                  "type": "string",
+                                  "id": 1
+                                },
+                                "pageSpan": {
+                                  "type": "LayoutPageSpan",
+                                  "id": 5
+                                }
+                              },
+                              "nested": {
+                                "LayoutPageSpan": {
+                                  "fields": {
+                                    "pageStart": {
+                                      "type": "int32",
+                                      "id": 1
+                                    },
+                                    "pageEnd": {
+                                      "type": "int32",
+                                      "id": 2
+                                    }
+                                  }
+                                },
+                                "LayoutTextBlock": {
+                                  "fields": {
+                                    "text": {
+                                      "type": "string",
+                                      "id": 1
+                                    },
+                                    "type": {
+                                      "type": "string",
+                                      "id": 2
+                                    },
+                                    "blocks": {
+                                      "rule": "repeated",
+                                      "type": "DocumentLayoutBlock",
+                                      "id": 3
+                                    }
+                                  }
+                                },
+                                "LayoutTableBlock": {
+                                  "fields": {
+                                    "headerRows": {
+                                      "rule": "repeated",
+                                      "type": "LayoutTableRow",
+                                      "id": 1
+                                    },
+                                    "bodyRows": {
+                                      "rule": "repeated",
+                                      "type": "LayoutTableRow",
+                                      "id": 2
+                                    },
+                                    "caption": {
+                                      "type": "string",
+                                      "id": 3
+                                    }
+                                  }
+                                },
+                                "LayoutTableRow": {
+                                  "fields": {
+                                    "cells": {
+                                      "rule": "repeated",
+                                      "type": "LayoutTableCell",
+                                      "id": 1
+                                    }
+                                  }
+                                },
+                                "LayoutTableCell": {
+                                  "fields": {
+                                    "blocks": {
+                                      "rule": "repeated",
+                                      "type": "DocumentLayoutBlock",
+                                      "id": 1
+                                    },
+                                    "rowSpan": {
+                                      "type": "int32",
+                                      "id": 2
+                                    },
+                                    "colSpan": {
+                                      "type": "int32",
+                                      "id": 3
+                                    }
+                                  }
+                                },
+                                "LayoutListBlock": {
+                                  "fields": {
+                                    "listEntries": {
+                                      "rule": "repeated",
+                                      "type": "LayoutListEntry",
+                                      "id": 1
+                                    },
+                                    "type": {
+                                      "type": "string",
+                                      "id": 2
+                                    }
+                                  }
+                                },
+                                "LayoutListEntry": {
+                                  "fields": {
+                                    "blocks": {
+                                      "rule": "repeated",
+                                      "type": "DocumentLayoutBlock",
+                                      "id": 1
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          }
+                        },
+                        "ChunkedDocument": {
+                          "fields": {
+                            "chunks": {
+                              "rule": "repeated",
+                              "type": "Chunk",
+                              "id": 1
+                            }
+                          },
+                          "nested": {
+                            "Chunk": {
+                              "fields": {
+                                "chunkId": {
+                                  "type": "string",
+                                  "id": 1
+                                },
+                                "sourceBlockIds": {
+                                  "rule": "repeated",
+                                  "type": "string",
+                                  "id": 2
+                                },
+                                "content": {
+                                  "type": "string",
+                                  "id": 3
+                                },
+                                "pageSpan": {
+                                  "type": "ChunkPageSpan",
+                                  "id": 4
+                                },
+                                "pageHeaders": {
+                                  "rule": "repeated",
+                                  "type": "ChunkPageHeader",
+                                  "id": 5
+                                },
+                                "pageFooters": {
+                                  "rule": "repeated",
+                                  "type": "ChunkPageFooter",
+                                  "id": 6
+                                }
+                              },
+                              "nested": {
+                                "ChunkPageSpan": {
+                                  "fields": {
+                                    "pageStart": {
+                                      "type": "int32",
+                                      "id": 1
+                                    },
+                                    "pageEnd": {
+                                      "type": "int32",
+                                      "id": 2
+                                    }
+                                  }
+                                },
+                                "ChunkPageHeader": {
+                                  "fields": {
+                                    "text": {
+                                      "type": "string",
+                                      "id": 1
+                                    },
+                                    "pageSpan": {
+                                      "type": "ChunkPageSpan",
+                                      "id": 2
+                                    }
+                                  }
+                                },
+                                "ChunkPageFooter": {
+                                  "fields": {
+                                    "text": {
+                                      "type": "string",
+                                      "id": 1
+                                    },
+                                    "pageSpan": {
+                                      "type": "ChunkPageSpan",
+                                      "id": 2
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          }
                         }
                       }
                     },
diff --git a/packages/google-cloud-contentwarehouse/samples/generated/v1/snippet_metadata.google.cloud.contentwarehouse.v1.json b/packages/google-cloud-contentwarehouse/samples/generated/v1/snippet_metadata.google.cloud.contentwarehouse.v1.json
index 3163a9d5ed9..0a6daff3404 100644
--- a/packages/google-cloud-contentwarehouse/samples/generated/v1/snippet_metadata.google.cloud.contentwarehouse.v1.json
+++ b/packages/google-cloud-contentwarehouse/samples/generated/v1/snippet_metadata.google.cloud.contentwarehouse.v1.json
@@ -1,7 +1,7 @@
 {
     "clientLibrary": {
         "name": "nodejs-contentwarehouse",
-        "version": "1.7.0",
+        "version": "1.8.0",
         "language": "TYPESCRIPT",
         "apis": [
             {
diff --git a/packages/google-cloud-contentwarehouse/samples/generated/v1/snippet_metadata_google.cloud.contentwarehouse.v1.json b/packages/google-cloud-contentwarehouse/samples/generated/v1/snippet_metadata_google.cloud.contentwarehouse.v1.json
index eec8655a9d2..3cee4c64261 100644
--- a/packages/google-cloud-contentwarehouse/samples/generated/v1/snippet_metadata_google.cloud.contentwarehouse.v1.json
+++ b/packages/google-cloud-contentwarehouse/samples/generated/v1/snippet_metadata_google.cloud.contentwarehouse.v1.json
@@ -1,7 +1,7 @@
 {
     "clientLibrary": {
         "name": "nodejs-contentwarehouse",
-        "version": "1.7.0",
+        "version": "1.8.0",
         "language": "TYPESCRIPT",
         "apis": [
             {