@prefix : <foo://bla#>.
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix owl: <http://www.w3.org/2002/07/owl#>.
  [ :name "John";  :married [ :name "Mary" ]] .
  :married rdf:type owl:SymmetricProperty.