# Tag
<a name="API_Tag"></a>

Metadata assigned to an Amazon DocumentDB resource consisting of a key-value pair.

## Contents
<a name="API_Tag_Contents"></a>

**Note**  
In the following list, the required parameters are described first.

 ** Key **   
The required name of the tag. The string value can be from 1 to 128 Unicode characters in length and can't be prefixed with "`aws:`" or "`rds:`". The string can contain only the set of Unicode letters, digits, white space, '\$1', '.', '/', '=', '\$1', '-' (Java regex: "^([\$1\$1p\$1L\$1\$1\$1p\$1Z\$1\$1\$1p\$1N\$1\$1.:/=\$1\$1\$1-]\$1)\$1").  
Type: String  
Required: No

 ** Value **   
The optional value of the tag. The string value can be from 1 to 256 Unicode characters in length and can't be prefixed with "`aws:`" or "`rds:`". The string can contain only the set of Unicode letters, digits, white space, '\$1', '.', '/', '=', '\$1', '-' (Java regex: "^([\$1\$1p\$1L\$1\$1\$1p\$1Z\$1\$1\$1p\$1N\$1\$1.:/=\$1\$1\$1-]\$1)\$1").  
Type: String  
Required: No

## See Also
<a name="API_Tag_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/docdb-2014-10-31/Tag) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/docdb-2014-10-31/Tag) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/docdb-2014-10-31/Tag)