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GWILLIAMS / RDF-Query-2.917 / data / t-sparql11-aggregates-1.rdf 
<?xml version="1.0" encoding="utf-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://books.example/">
  <rdf:Description rdf:about="http://books.example/org1">
    <affiliates rdf:resource="http://books.example/auth1"/>
  </rdf:Description>
  <rdf:Description rdf:about="http://books.example/org1">
    <affiliates rdf:resource="http://books.example/auth2"/>
  </rdf:Description>
  <rdf:Description rdf:about="http://books.example/auth1">
    <writesBook rdf:resource="http://books.example/book1"/>
  </rdf:Description>
  <rdf:Description rdf:about="http://books.example/auth1">
    <writesBook rdf:resource="http://books.example/book2"/>
  </rdf:Description>
  <rdf:Description rdf:about="http://books.example/book1">
    <price rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">9</price>
  </rdf:Description>
  <rdf:Description rdf:about="http://books.example/book2">
    <price rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">5</price>
  </rdf:Description>
  <rdf:Description rdf:about="http://books.example/auth2">
    <writesBook rdf:resource="http://books.example/book3"/>
  </rdf:Description>
  <rdf:Description rdf:about="http://books.example/book3">
    <price rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">7</price>
  </rdf:Description>
  <rdf:Description rdf:about="http://books.example/org2">
    <affiliates rdf:resource="http://books.example/auth3"/>
  </rdf:Description>
  <rdf:Description rdf:about="http://books.example/auth3">
    <writesBook rdf:resource="http://books.example/book4"/>
  </rdf:Description>
  <rdf:Description rdf:about="http://books.example/book4">
    <price rdf:datatype="http://www.w3.org/2001/XMLSchema#integer">7</price>
  </rdf:Description>
</rdf:RDF>