# ResourceTag
<a name="API_ResourceTag"></a>

Tags are key-value pairs that can be associated with Amazon SWF state machines and activities.

Tags may only contain unicode letters, digits, whitespace, or these symbols: `_ . : / = + - @`.

## Contents
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 ** key **   <a name="SWF-Type-ResourceTag-key"></a>
The key of a tag.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Required: Yes

 ** value **   <a name="SWF-Type-ResourceTag-value"></a>
The value of a tag.  
Type: String  
Length Constraints: Maximum length of 256.  
Required: No

## See Also
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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/swf-2012-01-25/ResourceTag) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/swf-2012-01-25/ResourceTag) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/swf-2012-01-25/ResourceTag)