RXR RDF collections — the short way

<graph xmlns="http://ilrt.org/discovery/2004/03/rxr/">
  <triple>
    <subject uri="http://example.org/hat"/>
    <predicate uri="http://example.org/contains"/>
    <collection>
      <object>bat</object>
      <object>cat</object>
      <object>dog</object>
    </collection>
  </triple>
</graph>