# EntityTypesListItem
<a name="API_EntityTypesListItem"></a>

An entity type within a labeled training dataset that Amazon Comprehend uses to train a custom entity recognizer.

## Contents
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 ** Type **   <a name="comprehend-Type-EntityTypesListItem-Type"></a>
An entity type within a labeled training dataset that Amazon Comprehend uses to train a custom entity recognizer.  
Entity types must not contain the following invalid characters: \\n (line break), \\\\n (escaped line break, \\r (carriage return), \\\\r (escaped carriage return), \\t (tab), \\\\t (escaped tab), and , (comma).  
Type: String  
Length Constraints: Maximum length of 64.  
Pattern: `^(?![^\n\r\t,]*\\n|\\r|\\t)[^\n\r\t,]+$`   
Required: Yes

## 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\+\+](https://docs.aws.amazon.com/goto/SdkForCpp/comprehend-2017-11-27/EntityTypesListItem) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/comprehend-2017-11-27/EntityTypesListItem) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/comprehend-2017-11-27/EntityTypesListItem)