We also have a somewhat independent line of inquiry into a type system that
will support evolution better; this should yield a type system that can better
take advantage of the extensibility inherent in XML. We haven't yet gotten far
enough to make a public release of this work (W3C members can find pointers to
very preliminary, rough, incomplete, inconsistent, nearly incoherent drafts on
the HTTP-NG Protocol Design Group home page). Once we've got the ideas worked
out, we plan to integrate them into the Architectural Model.
Mike