/// What are the top level properties for the vCard for "John Smith"
   

SELECT ?property
WHERE (?person, <vCard:FN>, "John Smith") ,
      (?person, ?property, ?obj)
USING 
   vCard FOR <http://www.w3.org/2001/vcard-rdf/3.0#> ,
   rdf   FOR <http://www.w3.org/1999/02/22-rdf-syntax-ns#>