SPARQL

Basic Patterns

SELECT ?givenName
WHERE
  { ?y  <http://www.w3.org/2001/vcard-rdf/3.0#Family>  "Smith" .
    ?y  <http://www.w3.org/2001/vcard-rdf/3.0#Given>  ?givenName .
  }

Or

PREFIX vcard:      <http://www.w3.org/2001/vcard-rdf/3.0#>

SELECT ?givenName
WHERE
 { ?y vcard:Family "Smith" .
   ?y vcard:Given  ?givenName .
 }

Notes

PREFIX vcard:      <http://www.w3.org/2001/vcard-rdf/3.0#>

This command replaces vcard: in query by http://www.w3.org/2001/vcard-rdf/3.0#

Result

-------------
| givenName |
=============
| "John"    |
| "Rebecca" |
-------------

References

1. Apache Jena Tutorials