# PrimitiveMessageDefinition
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Represents a primitive type node of the complex data structure.

## 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.

 ** ros2PrimitiveMessageDefinition **   <a name="iotfleetwise-Type-PrimitiveMessageDefinition-ros2PrimitiveMessageDefinition"></a>
Information about a `PrimitiveMessage` using a ROS 2 compliant primitive type message of the complex data structure.  
Type: [ROS2PrimitiveMessageDefinition](API_ROS2PrimitiveMessageDefinition.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/PrimitiveMessageDefinition) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/iotfleetwise-2021-06-17/PrimitiveMessageDefinition) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/iotfleetwise-2021-06-17/PrimitiveMessageDefinition)