Chapter 4. Reference
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## Chapter 4. Reference

GUI specifications file must have a `.xxe_gui` suffix. Customization files automatically detected by XXE during its startup must be called `customize.xxe_gui`.

All the elements described in this chapter belong to the "`http://www.xmlmind.com/xmleditor/schema/gui`" namespace. The local name of the root element of a GUI specification must be `gui`:

    <?xml version='1.0' encoding='UTF-8'?>
    <gui xmlns="http://www.xmlmind.com/xmleditor/schema/gui"
         xmlns:gui="http://www.xmlmind.com/xmleditor/schema/gui">
      ...
    </gui>

A `gui` root element may contain any number of the following elements, and that, in any order.

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