diff --git a/CHANGELOG.md b/CHANGELOG.md
index bce0088735..9c9576b4f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -105,6 +105,8 @@ Note: This is the first release of Semantic Conventions separate from the Specif
   ([#39](https://github.com/open-telemetry/semantic-conventions/pull/39))
 - Add Elasticsearch client semantic conventions.
   ([#23](https://github.com/open-telemetry/semantic-conventions/pull/23))
+- Add YAML definitions for log semantic conventions and define requirement levels
+  ([#133](https://github.com/open-telemetry/semantic-conventions/pull/133))
 
 ## v1.20.0 (2023-04-07)
 
diff --git a/semantic_conventions/logs/media.yaml b/semantic_conventions/logs/media.yaml
new file mode 100644
index 0000000000..b8d1c29975
--- /dev/null
+++ b/semantic_conventions/logs/media.yaml
@@ -0,0 +1,49 @@
+groups:
+  - id: attributes.log
+    prefix: log
+    type: attribute_group
+    brief: "Describes Log attributes"
+    attributes:
+      - id: iostream
+        requirement_level: opt_in
+        brief: >
+          The stream associated with the log. See below for a list of well-known values.
+        type:
+          allow_custom_values: false
+          members:
+            - id: stdout
+              value: 'stdout'
+              brief: 'Logs from stdout stream'
+            - id: stderr
+              value: 'stderr'
+              brief: 'Events from stderr stream'
+  - id: attributes.log.file
+    prefix: log.file
+    type: attribute_group
+    brief: >
+      A file to which log was emitted.
+    attributes:
+      - id: name
+        type: string
+        requirement_level: recommended
+        brief: >
+          The basename of the file.
+        examples: ["audit.log"]
+      - id: path
+        type: string
+        requirement_level: opt_in
+        brief: >
+          The full path to the file.
+        examples: [ "/var/log/mysql/audit.log" ]
+      - id: name_resolved
+        type: string
+        requirement_level: opt_in
+        brief: >
+          The basename of the file, with symlinks resolved.
+        examples: [ "uuid.log" ]
+      - id: path_resolved
+        type: string
+        requirement_level: opt_in
+        brief: >
+          The full path to the file, with symlinks resolved.
+        examples: [ "/var/lib/docker/uuid.log" ]
diff --git a/specification/logs/semantic_conventions/media.md b/specification/logs/semantic_conventions/media.md
index ed58410897..f17f83ba05 100644
--- a/specification/logs/semantic_conventions/media.md
+++ b/specification/logs/semantic_conventions/media.md
@@ -29,19 +29,30 @@ As such, these should be recorded as Log Record attributes when applicable. They
 
 **Description:** A file to which log was emitted.
 
-| Name                            | Notes and examples                                                                       |
-| ------------------------------- | ---------------------------------------------------------------------------------------- |
-| `log.file.name`          | The basename of the file. Example: `audit.log`                                           |
-| `log.file.path`          | The full path to the file. Example: `/var/log/mysql/audit.log`                           |
-| `log.file.name_resolved` | The basename of the file, with symlinks resolved. Example: `uuid.log`                    |
-| `log.file.path_resolved` | The full path to the file, with symlinks resolved. Example: `/var/lib/docker/uuid.log`   |
+<!-- semconv attributes.log.file -->
+| Attribute  | Type | Description  | Examples  | Requirement Level |
+|---|---|---|---|---|
+| `log.file.name` | string | The basename of the file. | `audit.log` | Recommended |
+| `log.file.path` | string | The full path to the file. | `/var/log/mysql/audit.log` | Opt-In |
+| `log.file.name_resolved` | string | The basename of the file, with symlinks resolved. | `uuid.log` | Opt-In |
+| `log.file.path_resolved` | string | The full path to the file, with symlinks resolved. | `/var/lib/docker/uuid.log` | Opt-In |
+<!-- endsemconv -->
 
 ### I/O Stream
 
 **Description:** The I/O stream to which the log was emitted.
 
-| Name                            | Notes and examples                                                                       |
-| ------------------------------- | ---------------------------------------------------------------------------------------- |
-| `log.iostream`        | The stream associated with the log. SHOULD be one of: `stdout`, `stderr` |
+<!-- semconv attributes.log -->
+| Attribute  | Type | Description  | Examples  | Requirement Level |
+|---|---|---|---|---|
+| `log.iostream` | string | The stream associated with the log. See below for a list of well-known values. | `stdout` | Opt-In |
+
+`log.iostream` MUST be one of the following:
+
+| Value  | Description |
+|---|---|
+| `stdout` | Logs from stdout stream |
+| `stderr` | Events from stderr stream |
+<!-- endsemconv -->
 
 [DocumentStatus]: https://github.com/open-telemetry/opentelemetry-specification/blob/v1.21.0/specification/document-status.md