<rdf:RDF  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
          xmlns:skos="http://www.w3.org/2004/02/skos/core#">


  <!-- Example ADAPTED from the UK GCL:
  http://www.govtalk.gov.uk/schemasstandards/gcl.asp
  ... -->  
  
  <skos:Concept rdf:about="http://my.example.org/GCL/499#concept">
    <skos:prefLabel>Agriculture, environment and natural resources</skos:prefLabel>
    <skos:narrower rdf:resource="http://my.example.org/GCL/500#concept"/>
    <skos:narrower rdf:resource="http://my.example.org/GCL/501#concept"/>
  </skos:Concept>
  
  <skos:Concept rdf:about="http://my.example.org/GCL/500#concept">
    <skos:prefLabel>Energy and fuel</skos:prefLabel>
  </skos:Concept>

  <skos:Concept rdf:about="http://my.example.org/GCL/501#concept">
    <skos:prefLabel>Environmental protection</skos:prefLabel>
    <skos:narrower rdf:resource="http://my.example.org/GCL/793#concept"/>
  </skos:Concept>
  
  <skos:Concept rdf:about="http://my.example.org/GCL/793#concept">
    <skos:prefLabel>Climate and weather</skos:prefLabel>
  </skos:Concept>


  <!-- Example ADAPTED from the AAT:
  http://www.getty.edu/research/conducting_research/vocabularies/aat/
  ... -->   
         
  <skos:Concept rdf:about="http://my.example.org/AAT/300264090#concept">
    <skos:prefLabel>Activities</skos:prefLabel>
    <skos:narrower rdf:resource="http://my.example.org/AAT/300054134#concept"/>
  </skos:Concept>

  <skos:Concept rdf:about="http://my.example.org/AAT/300054134#concept">
    <skos:prefLabel>Disciplines</skos:prefLabel>
    <skos:narrower rdf:resource="http://my.example.org/AAT/300054314#concept"/>
  </skos:Concept>

  <skos:Concept rdf:about="http://my.example.org/AAT/300054314#concept">
    <skos:prefLabel>Social sciences</skos:prefLabel>
  </skos:Concept>


  <!-- Examples ADAPTED from PACS:
  http://www.aip.org/pacs/
  ... -->
         
  <skos:Concept rdf:about="http://my.example.org/PACS/40.#concept">
    <skos:prefLabel>ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS</skos:prefLabel>
    <skos:narrower rdf:resource="http://my.example.org/PACS/41.#concept"/>
  </skos:Concept>

  <skos:Concept rdf:about="http://my.example.org/PACS/41.#concept">
    <skos:prefLabel>Electromagnetism; electron and ion optics</skos:prefLabel>
    <skos:narrower rdf:resource="http://my.example.org/PACS/41.50.+h#concept"/>
  </skos:Concept>

  <skos:Concept rdf:about="http://my.example.org/PACS/41.50.+h#concept">
    <skos:prefLabel>X-ray beams and x-ray optics</skos:prefLabel>
  </skos:Concept>
         
</rdf:RDF>