<?xml version="1.0"?>
<doc xmlns:r="http://www.r-project.org"  xmlns:omg="http://www.omegahat.net">
  <a xmlns:omg="http://www.omegahat.net">
    <b xmlns:r="http://www.r-project.org" xmlns:rh="http://www.r-project.org/help"/>
    <r:func>foo</r:func>
    <c xmlns:r="http://www.other.org" >
       <r:foo/>
    </c>
  </a>
</doc>
