Extend triple knowledge with ontology

Hi, I'm new to neo4j and n10s. Thanks for the excellent work first of all. I have a question which is that we actually wish to save some triples with neo4j and then give some comprehensive hierarchy with owl in the class level and automatically linked with all the triples saved in neo4j. But when I read the documentation, I found that, neo4j will automatically associate it with uri, I'm a little bit confused that, the uri is only exist in the owl and rdf, how can I associate that with stored triples? Or maybe the whole direction of mine is wrong, if so, could you show me how to do so? Thanks