@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix : <foo:bla#>.
:Person owl:hasKey (:givenName :familyName).
 _:b1 a :Person; :firstName "John"; :familyName "Doe";  :age 32 .
 _:b2 a :Person; :firstName "John"; :familyName "Doe";  :address "Main Street 1" .