p_query_match_o :: RDF g => (g -> Triples) -> g -> Property
p_query_match_o = mk_query_match_fn sameObj f
  where f t = (Nothing, Nothing, Just (objectOf t))

-- verify likewise for fixed subject and predicate with wildcard object
p_query_match_o :: RDF g => (g -> Triples) -> g -> Property
p_query_match_o = mk_query_match_fn sameObj f
  where f t = (Nothing, Nothing, Just (objectOf t))

-- verify likewise for fixed subject and predicate with wildcard object
p_query_match_o = mk_query_match_fn sameObj f
  where f t = (Nothing, Nothing, Just (objectOf t))

-- verify likewise for fixed subject and predicate with wildcard object