Apply the rule to the opaque string. If necessary, find subspace and rule used for it in the subspace registry for the name space. If necessary, repeat 2 at the next lower level until you are told where to get information about the resource identified by the name. IETF maintains mailing lists for people who want to participate in the formulation of specific standards. Join by signing up.
Mailing lists are the final authority.
Contemplated URN agents, but ended work. Labels were numeric only. The data model is a directed graphs consisting of nodes and arcs. RDF defines a system for establishing link types and specifies some broadly useful primitives. The RDF syntax is mapped to an XML format.