vesoft-inc · abby-cyber · Nov 20, 2023 · Nov 20, 2023
diff --git a/docs-2.0-en/3.ngql-guide/10.tag-statements/1.create-tag.md b/docs-2.0-en/3.ngql-guide/10.tag-statements/1.create-tag.md
@@ -34,7 +34,7 @@ CREATE TAG [IF NOT EXISTS] <tag_name>
 |`<tag_name>`|1. Each tag name in the graph space must be **unique**. <br>2. Tag names cannot be modified after they are set.<br/> 3. By default, the space name only supports 1-4 byte UTF-8 encoded characters, including English letters (case sensitive), numbers, Chinese characters, etc. However, it cannot include special characters other than the underscore (_), and cannot start with a number.<br/> 4. To use special characters, reserved keywords, or start with a number, quote the entire name with backticks (\`) and do not include periods (`.`) with the pair of backticks (\`). For more information, see [Keywords and reserved words](../../3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md). **Note**: If you name a tag in Chinese and encounter a `SyntaxError`, you need to quote the Chinese characters with backticks (\`).|
 |`<prop_name>`|The name of the property. It must be unique for each tag. The rules for permitted property names are the same as those for tag names.|
 |`<data_type>`|Shows the data type of each property. For a full description of the property data types, see [Data types](../3.data-types/1.numeric.md) and [Boolean](../3.data-types/2.boolean.md).|
-|`NULL \| NOT NULL`|Specifies if the property supports `NULL | NOT NULL`. The default value is `NULL`. |
+|`NULL | NOT NULL`|Specifies if the property supports `NULL | NOT NULL`. The default value is `NULL`. |
 |`DEFAULT`|Specifies a default value for a property. The default value can be a literal value or an expression supported by NebulaGraph. If no value is specified, the default value is used when inserting a new vertex.|
 |`COMMENT`|The remarks of a certain property or the tag itself. The maximum length is 256 bytes. By default, there will be no comments on a tag.|
 |`TTL_DURATION`|Specifies the life cycle for the property. The property that exceeds the specified TTL expires. The expiration threshold is the `TTL_COL` value plus the `TTL_DURATION`. The default value of `TTL_DURATION` is `0`. It means the data never expires.|

diff --git a/docs-2.0-en/3.ngql-guide/11.edge-type-statements/1.create-edge.md b/docs-2.0-en/3.ngql-guide/11.edge-type-statements/1.create-edge.md
@@ -34,7 +34,7 @@ CREATE EDGE [IF NOT EXISTS] <edge_type_name>
 |`<edge_type_name>`|1. The edge type name must be **unique** in a graph space.<br/> 2. Once the edge type name is set, it can not be altered.<br/> 3. By default, the space name only supports 1-4 byte UTF-8 encoded characters, including English letters (case sensitive), numbers, Chinese characters, etc. But special characters can only use underscore, and cannot start with a number.<br/> 4. To use special characters, reserved keywords, or start with a number, quote the entire name with backticks (\`) and cannot use periods (`.`). For more information, see [Keywords and reserved words](../../3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md). <br/>**Note**: If you name an edge type in Chinese and encounter a `SyntaxError`, you need to quote the Chinese characters with backticks (\`).|
 |`<prop_name>`|The name of the property. It must be unique for each edge type. The rules for permitted property names are the same as those for edge type names.|
 |`<data_type>`|Shows the data type of each property. For a full description of the property data types, see [Data types](../3.data-types/1.numeric.md) and [Boolean](../3.data-types/2.boolean.md).|
-|`NULL \| NOT NULL`|Specifies if the property supports `NULL | NOT NULL`. The default value is `NULL`. `DEFAULT` must be specified if `NOT NULL` is set.|
+|`NULL | NOT NULL`|Specifies if the property supports `NULL | NOT NULL`. The default value is `NULL`. `DEFAULT` must be specified if `NOT NULL` is set.|
 |`DEFAULT`|Specifies a default value for a property. The default value can be a literal value or an expression supported by NebulaGraph. If no value is specified, the default value is used when inserting a new edge.|
 |`COMMENT`|The remarks of a certain property or the edge type itself. The maximum length is 256 bytes. By default, there will be no comments on an edge type.|
 |`TTL_DURATION`|Specifies the life cycle for the property. The property that exceeds the specified TTL expires. The expiration threshold is the `TTL_COL` value plus the `TTL_DURATION`. The default value of `TTL_DURATION` is `0`. It means the data never expires.|

diff --git a/docs-2.0-en/import-export/nebula-exchange/parameter-reference/ex-ug-parameter.md b/docs-2.0-en/import-export/nebula-exchange/parameter-reference/ex-ug-parameter.md
@@ -203,7 +203,7 @@ For different data sources, the vertex configurations are different. There are m
 |:---|:---|:---|:---|:---|
 |`tags.service`|string|`"pulsar://localhost:6650"`|Yes|The Pulsar server address.
 |`tags.admin`|string|`"http://localhost:8081"`|Yes|The admin URL used to connect pulsar.|
-|`tags.options.<topic\|topics\| topicsPattern>`|string|-|Yes|Options offered by Pulsar, which can be configured by choosing one from `topic`, `topics`, and `topicsPattern`.|
+|`tags.options.<topic|topics| topicsPattern>`|string|-|Yes|Options offered by Pulsar, which can be configured by choosing one from `topic`, `topics`, and `topicsPattern`.|
 |`tags.interval.seconds`|int|`10`|Yes|The interval for reading messages. Unit: seconds.|
 
 ### Specific parameters of Kafka data sources

diff --git a/docs-2.0-zh/3.ngql-guide/10.tag-statements/1.create-tag.md b/docs-2.0-zh/3.ngql-guide/10.tag-statements/1.create-tag.md
@@ -34,7 +34,7 @@ CREATE TAG [IF NOT EXISTS] <tag_name>
 |`<tag_name>`|1、每个图空间内的 Tag 必须是唯一的。<br>2、Tag 名称设置后无法修改。<br>3、默认情况下，仅支持 1~4 字节的 UTF-8 编码字符，包括英文字母（区分大小写）、数字、中文等，但是特殊字符只能使用下划线。不能以数字开头。<br>4、如果需要使用特殊字符、保留关键字或者以数字开头，请使用反引号（\`）包围整个名称。反引号中不能包含英文句号（`.`）。详情参见[关键字和保留字](../../3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md)。<br/>**注意**：如果以中文命名 Tag，报`SyntaxError`错误时，需使用反引号（\`）包围中文字符。|
 |`<prop_name>`|属性名称。每个 Tag 中的属性名称必须唯一。属性的命名规则与 Tag 相同。|
 |`<data_type>`|属性的数据类型，目前支持[数值](../3.data-types/1.numeric.md)、[布尔](../3.data-types/2.boolean.md)、[字符串](../3.data-types/3.string.md)以及[日期与时间](../3.data-types/4.date-and-time.md)。|
-|`NULL \| NOT NULL`|指定属性值是否支持为`NULL`。默认值为`NULL`。指定`NOT NULL`且没有指定`DEFAULT`值时，插入数据必须指定值；同时指定`NOT NULL`和`DEFAULT`值时，插入数据如果没有指定值，则默认插入`DEFAULT`值。| 
+|`NULL | NOT NULL`|指定属性值是否支持为`NULL`。默认值为`NULL`。指定`NOT NULL`且没有指定`DEFAULT`值时，插入数据必须指定值；同时指定`NOT NULL`和`DEFAULT`值时，插入数据如果没有指定值，则默认插入`DEFAULT`值。| 
 |`DEFAULT`|指定属性的默认值。默认值可以是一个文字值或 {{nebula.name}} 支持的表达式。如果插入点时没有指定某个属性的值，则使用默认值。|
 |`COMMENT`|对单个属性或 Tag 的描述。最大为 256 字节。默认无描述。|
 |`TTL_DURATION`|指定时间戳差值，单位：秒。时间戳差值必须为 64 位非负整数。属性值和时间戳差值之和如果小于当前时间戳，属性就会过期。默认值为`0`，表示属性永不过期。|

diff --git a/docs-2.0-zh/3.ngql-guide/11.edge-type-statements/1.create-edge.md b/docs-2.0-zh/3.ngql-guide/11.edge-type-statements/1.create-edge.md
@@ -34,7 +34,7 @@ CREATE EDGE [IF NOT EXISTS] <edge_type_name>
 |`<edge_type_name>`|1、每个图空间内的 Edge type 必须是唯一的。<br/> 2、Edge type 名称设置后无法修改。<br/>3、默认情况下，仅支持 1~4 字节的 UTF-8 编码字符，包括英文字母（区分大小写）、数字、中文等，但是特殊字符只能使用下划线。不能以数字开头。<br>4、如果需要使用特殊字符、保留关键字或者以数字开头，请使用反引号（\`）包围整个名称。反引号中不能包含英文句号（`.`）。详情参见[关键字和保留字](../../3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md)。<br/>**注意**：如果以中文命名 Edge type，报`SyntaxError`错误时，需使用反引号（\`）包围中文字符。|
 |`<prop_name>`|属性名称。每个 Edge type 中的属性名称必须唯一。属性的命名规则与 Edge type 相同。|
 |`<data_type>`|属性的数据类型，目前支持[数值](../3.data-types/1.numeric.md)、[布尔](../3.data-types/2.boolean.md)、[字符串](../3.data-types/3.string.md)以及[日期与时间](../3.data-types/4.date-and-time.md)。|
-|`NULL \| NOT NULL`|指定属性值是否支持为`NULL`。默认值为`NULL`。当指定属性值为`NOT NULL`时，必需指定属性的默认值，也就是`DEFAULT`的值。|
+|`NULL | NOT NULL`|指定属性值是否支持为`NULL`。默认值为`NULL`。当指定属性值为`NOT NULL`时，必需指定属性的默认值，也就是`DEFAULT`的值。|
 |`DEFAULT`|指定属性的默认值。默认值可以是一个文字值或 {{nebula.name}} 支持的表达式。如果插入边时没有指定某个属性的值，则使用默认值。|
 |`COMMENT`|对单个属性或 Edge type 的描述。最大为 256 字节。默认无描述。|
 |`TTL_DURATION`|指定时间戳差值，单位：秒。时间戳差值必须为 64 位非负整数。属性值和时间戳差值之和如果小于当前时间戳，属性就会过期。默认值为`0`，表示属性永不过期。|

diff --git a/docs-2.0-zh/import-export/nebula-exchange/parameter-reference/ex-ug-parameter.md b/docs-2.0-zh/import-export/nebula-exchange/parameter-reference/ex-ug-parameter.md
@@ -205,7 +205,7 @@
 |:---|:---|:---|:---|:---|
 |`tags.service`|string|`"pulsar://localhost:6650"`|是|Pulsar 服务器地址。|
 |`tags.admin`|string|`"http://localhost:8081"`|是|连接 pulsar 的 admin.url。|
-|`tags.options.<topic\|topics\| topicsPattern>`|string|-|是|Pulsar 的选项，可以从`topic`、`topics`和`topicsPattern`选择一个进行配置。|
+|`tags.options.<topic|topics|topicsPattern>`|string|-|是|Pulsar 的选项，可以从`topic`、`topics`和`topicsPattern`选择一个进行配置。|
 |`tags.interval.seconds`|int|`10`|是|读取消息的间隔。单位：秒。|
 
 ### Kafka 源特有参数