<?xml version="1.0"?>

<root xmlns="http://www.grid2004.org/ns/attribnames"
      xmlns:att="http://www.grid2004.org/ns/attribnames"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.grid2004.org/ns/attribnames
                            attribnames.xsd">

    <element attribute="something"/>
<!--
    <element att:attribute="something"/>
-->
</root>