1@prefix :  <http://example.org/x/> .
2@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
3@prefix owl: <http://www.w3.org/2002/07/owl#> .
4
5_:ont a owl:Ontology .
6
7:p a owl:ObjectProperty .
8:c a owl:Class .
9
10 :x :p :y.
11 :x rdf:type :c.
12