@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . 
@prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix :     <http://example.com/#> .

:C1 rdfs:subClassOf :C2 .
:x rdf:type :C1 .