<?xml version="1.0"?>
<attributes>
  <block name="Generic OS Services" inherit="no">
    <attrs comment="This package is...">
    </attrs>
  </block>
    <coll name="MTP Data Providers" inherit="yes">
    <attrs this="comm"  that="no"/>
  </coll>
  <layer name="Hardware" inherit="yes">
   <attrs foo="bar" baz="xyzzy"/>
  </layer>
</attributes>