RDF.hs: added notion of a BaseUrl of a graph; changed constructor method to take optional baseUrl and a map of prefixes; added a new BNode type for genid bnodes as used in Turtle/N3.
RDF.hs: added notion of a BaseUrl of a graph; changed constructor method to take optional baseUrl and a map of prefixes; added a new BNode type for genid bnodes as used in Turtle/N3.

darcs-hash:20071017013814-db1bb-409fa8e32225a0b0e5d24d83941ed457604f487f.gz

amccausl/RDF4H