Hiya
Expanding my comment from SWCG call:I had a use case in FOAF to be able to represent in RDF that xyz was the concrete set of bytes we get by conneg as text/html, that abc was another set of bytes we get by conneg as application/rdf+xml, and that some other documents were the results of pgp signing one or the other of those...
http://www.w3.org/TR/Content-in-RDF/#base64ContentClass looks close, but i've not reviewed it yet
cheers Dan
