What about PREV? (was Re: Summary: URL rev proposals)

I don't recall seeing anyone mention that

   http://host/.../repos@PREV/x/y/z

   http://host/.../repos/x/y@PREV/z

   http://host/.../repos/x/y/z@PREV

May all logically and intuitively refer to valid and different
resources, at least if my limited understanding (gained with |svn diff
-rPREV| on various paths in a working copy constructed to test this
theory) is correct. I think this only applies to 'PREV', but that
doesn't stop it from impacting the whole of the problem.
__________
Scott Collins <http://ScottCollins.net/>