# StructuredMessage
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The structured message for the message signal. It can be defined with either a `primitiveMessageDefinition`, `structuredMessageListDefinition`, or `structuredMessageDefinition` recursively.

## Contents
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**Important**  
This data type is a UNION, so only one of the following members can be specified when used or returned.

 ** primitiveMessageDefinition **   <a name="iotfleetwise-Type-StructuredMessage-primitiveMessageDefinition"></a>
Represents a primitive type node of the complex data structure.  
Type: [PrimitiveMessageDefinition](API_PrimitiveMessageDefinition.md) object  
 **Note: **This object is a Union. Only one member of this object can be specified or returned.  
Required: No

 ** structuredMessageDefinition **   <a name="iotfleetwise-Type-StructuredMessage-structuredMessageDefinition"></a>
Represents a struct type node of the complex data structure.  
Type: Array of [StructuredMessageFieldNameAndDataTypePair](API_StructuredMessageFieldNameAndDataTypePair.md) objects  
Array Members: Minimum number of 1 item. Maximum number of 500 items.  
Required: No

 ** structuredMessageListDefinition **   <a name="iotfleetwise-Type-StructuredMessage-structuredMessageListDefinition"></a>
Represents a list type node of the complex data structure.  
Type: [StructuredMessageListDefinition](API_StructuredMessageListDefinition.md) object  
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/iotfleetwise-2021-06-17/StructuredMessage) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/iotfleetwise-2021-06-17/StructuredMessage) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/iotfleetwise-2021-06-17/StructuredMessage)