Do you know of any specific ones? From what I've seen, RDF storage engines currently implemented, such as the various engines in Sesame, are all pretty slow. I

Do you know of any specific ones? From what I've seen, RDF storage engines currently implemented, such as the various engines in Sesame, are all pretty slow. I'm doing a bit of work on trying to implement an RDF store on top of HBase - has anyone thought about this and would be interested in throwing ideas around?