As far as I can see, no URL should refer to different mechanisms in
different contexts. Lets have ftp: (use ftp ONLY) and file: (local file
system ONLY, further use discouraged). I don't want an afs: URL,
because it's equivalent to file: if you're an AFS site, and useless if
you aren't. OK, AFS sites (we are one) can mount each others file
systems, but it's NOT a preferred method of allowing the world access
to info that we want to make public.