# Attribute
<a name="API_Attribute"></a>

Contains an asset attribute property. For more information, see [Attributes](https://docs.amazonaws.cn/iot-sitewise/latest/userguide/asset-properties.html#attributes) in the * Amazon IoT SiteWise User Guide*.

## Contents
<a name="API_Attribute_Contents"></a>

 ** defaultValue **   <a name="iotsitewise-Type-Attribute-defaultValue"></a>
The default value of the asset model property attribute. All assets that you create from the asset model contain this attribute value. You can update an attribute's value after you create an asset. For more information, see [Updating attribute values](https://docs.amazonaws.cn/iot-sitewise/latest/userguide/update-attribute-values.html) in the * Amazon IoT SiteWise User Guide*.  
Type: String  
Pattern: `[^\u0000-\u001F\u007F]+`   
Required: No

## 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\$1\$1](https://docs.amazonaws.cn/goto/SdkForCpp/iotsitewise-2019-12-02/Attribute) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/iotsitewise-2019-12-02/Attribute) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/iotsitewise-2019-12-02/Attribute)