<rdf:RDF
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:skos="http://www.w3.org/2004/02/skos/core#"
  xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
  
  <!-- Example of a labelled collection -->

  <skos:Concept rdf:about="http://www.example.com/concepts#milk">
    <skos:prefLabel>milk</skos:prefLabel>
    <skos:narrower>
      <skos:Collection>
        <rdfs:label>milk by source animal</rdfs:label>
        <skos:member rdf:resource="http://www.example.com/concepts#buffalomilk"/>
        <skos:member rdf:resource="http://www.example.com/concepts#cowmilk"/>
        <skos:member rdf:resource="http://www.example.com/concepts#goatmilk"/>
        <skos:member rdf:resource="http://www.example.com/concepts#sheepmilk"/>
      </skos:Collection>
    </skos:narrower>
  </skos:Concept>

  <!-- Example of nested labelled collections -->

  <skos:Concept rdf:about="http://www.example.com/concepts#chairs">
    <skos:prefLabel>chairs</skos:prefLabel>
    <skos:narrower>
      <skos:Collection>
        <rdfs:label>chairs by form</rdfs:label>
        <skos:member rdf:resource="http://www.example.com/concepts#armchairs"/>
        <skos:member rdf:resource="http://www.example.com/concepts#easychairs"/>
        <skos:member>
          <skos:Collection>
            <rdfs:label>chairs by form: back form</rdfs:label>
            <skos:member rdf:resource="http://www.example.com/concepts#heartbackchairs"/>
            <skos:member rdf:resource="http://www.example.com/concepts#ovalbackchairs"/>
          </skos:Collection>
        </skos:member>
      </skos:Collection>
    </skos:narrower>
  </skos:Concept>
  
</rdf:RDF>