title: Sparql query between ontologies
body: <p>I load Jena with two ontologies. They both have a Person class defined. They both have a person name John. They are not the "same" John; different person, different prefix, different IRI. Without changing original ontologies, is there a system (say adding a triple to the store) so that they could be equivalent. An rdfs:subClassOf builtin?</p>