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title: DataFormat Annotations (dw::extension::DataFormat)
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# DataFormat Annotations (dw::extension::DataFormat)

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

<table><colgroup><col> <col> <col></colgroup><thead><tr><th>Annotation</th><th>Definition</th><th>Description</th></tr></thead><tbody><tr><td><p>DataFormatExtension</p></td><td><div><div><p><code>@DataFormatExtension()</code></p></div></div></td><td><div><div><p>Registration hook that the DataWeave engine uses to discover the variable that represents the custom data format. For an example, see the <a href="https://github.com/mulesoft-labs/data-weave-custom-data-format/blob/master/README.md">Custom Data Formats Example README</a>.</p></div></div></td></tr></tbody></table>