Rdf4hMain.hs: added check for outputFormat to ensure that only ntriples is accepted, and changed output to not advertise turtle for output yet.
Rdf4hMain.hs: added check for outputFormat to ensure that only ntriples is accepted, and changed output to not advertise turtle for output yet.

darcs-hash:20071111045234-db1bb-59ea22b4bb01fc09df4c87d66c5b45a9530c0984.gz

amccausl/RDF4H