# MessageComponentsSummary
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Contains the headline message component.

## Contents
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 ** headline **   <a name="Notifications-Type-MessageComponentsSummary-headline"></a>
A sentence long summary. For example, titles or an email subject line.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 256.  
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\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/notifications-2018-05-10/MessageComponentsSummary) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/notifications-2018-05-10/MessageComponentsSummary) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/notifications-2018-05-10/MessageComponentsSummary)