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title: Core Namespaces (dw::Core)
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description: MuleSoft Documentation Site
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product: DataWeave
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# Core Namespaces (dw::Core)

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

<table><colgroup><col> <col> <col></colgroup><thead><tr><th>Namespace</th><th>Definition</th><th>Description</th></tr></thead><tbody><tr><td><p>xsi</p></td><td><div><div><p><code>xsi = http://www.w3.org/2001/XMLSchema-instance</code></p></div></div></td><td><div><div><p>Namespace declaration of XMLSchema.</p></div></div></td></tr></tbody></table>