Using Schema Document 1.0.1

The Decoration XSD is located here.

Your favorite IDE probably supports XSD schema's for .xml files. You need to specify the following:

<document xmlns="http://maven.apache.org/DOCUMENT/1.0.1"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/DOCUMENT/1.0.1 http://maven.apache.org/xsd/document-1.0.1.xsd"
  outputName="...">
...
</document>