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SPARQL Example Query 3

    “Return the spouse of a person by the name of John Smith”

    PREFIX vCard: <http://www.w3.org/2001/vcard-rdf/3.0#>
    PREFIX ex: <http://example.org/#>
    SELECT ?y
    WHERE {?x vCard:FN "John Smith". ?x ex:marriedTo ?y}
  
 
result:

y
=================
<http://example.org/#mary>

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