# TopicReference
<a name="API_TopicReference"></a>

Topic reference.

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

 ** TopicArn **   <a name="QS-Type-TopicReference-TopicArn"></a>
Topic Amazon Resource Name (ARN).  
Type: String  
Required: Yes

 ** TopicPlaceholder **   <a name="QS-Type-TopicReference-TopicPlaceholder"></a>
Topic placeholder.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 2048.  
Required: Yes

## See Also
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For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon SDK for C\+\+](https://docs.amazonaws.cn/goto/SdkForCpp/quicksight-2018-04-01/TopicReference) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/quicksight-2018-04-01/TopicReference) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/quicksight-2018-04-01/TopicReference)