# XML

Learn how Vale handles XML content.

XML is supported through the external program [`xsltproc`](http://xmlsoft.org/XSLT/xsltproc.html). To install, see:

* [Chocolatey](https://community.chocolatey.org/packages/xsltproc) (Windows): `choco install xsltproc`.
* [Homebrew](https://formulae.brew.sh/formula/libxslt) (macOS): `brew install libxslt`.
* Debian/Ubuntu/apt-based systems: `apt-get install xsltproc`.

You’ll need to ensure that the `xsltproc` executable is available in your `$PATH`.

The supported extension is `.xml`.

You also need to provide a version 1.0 XSL Transformation (XSLT) for converting to HTML:

{% code title=".vale.ini" %}

```ini
[*.xml]
Transform = docbook-xsl-snapshot/html/docbook.xsl
```

{% endcode %}

Once converted, Vale will follow the same rules as it does for [HTML](/formats/html.md).

Related formats: [reStructuredText](/formats/restructuredtext.md) [Org](/formats/org.md)


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.vale.sh/formats/xml.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.