SubClassOf(<http://www.semanticweb.org/ontology#X0> <http://www.semanticweb.org/owlapi/test#C>)
SubClassOf(<http://www.semanticweb.org/ontology#X1> ObjectAllValuesFrom(<http://example.com/objectProperty> owl:Nothing))
SubClassOf(owl:Thing ObjectUnionOf(<http://www.semanticweb.org/ontology#X0> <http://www.semanticweb.org/ontology#X1>))