<?xml version="1.0"?>
<element name="foo"
xmlns="http://relaxng.org/ns/structure/1.0"
xmlns:a="http://relaxng.org/ns/annotation/1.0"
xmlns:ex1="http://www.example.com/n1"
xmlns:ex2="http://www.example.com/n2">
<a:documentation>A foo element.</a:documentation>
<element name="ex1:bar1">
<empty/>
</element>
<element name="ex2:bar2">
<empty/>
</element>
</element>