The TinkerPop3 integration in Stardog4 is impressive. The underlying specified OWL/RDFS schema allows Gremlin to traverser the implicit/reasoned edges. This is the best RDF/PropertyGraph-hybrid system I've seen.<p><a href="http://docs.stardog.com/#_property_graphs" rel="nofollow">http://docs.stardog.com/#_property_graphs</a>