TriplesGraph.hs: updated graph impl to use base url and prefix mappings, in accordance with graph type class changes.
TriplesGraph.hs: updated graph impl to use base url and prefix mappings, in accordance with graph type class changes.

darcs-hash:20071017014157-db1bb-104d2a69bb57337b4b72f894d125ef4746dfae85.gz

amccausl/RDF4H