Relative URLs for svn:external

Would it be possible to implement relative URLs in svn:externals? For
example:

  svn:externals:
    foo http://server/repos/foo
    bar ../xyz/relative-URL-to-bar/

Right now it results in:

  Fetching external item into bar
  svn: Bad URL passed to RA layer
  svn: Unrecognized URL scheme: "../xyz/relative-URL-to-bar/"

My reasoning is twofold:

(1) Without a real "svn link" command, svn:externals is the easiest way to
have a "live copy" of one part of a repository to another.

(2) Users can access the repository using all sorts of methods (http,
https,
svn, svn+ssh, etc.) and even different host names. Not all methods work
for all users (note how collab.net provides port 81 as well as port 80 so
that some people can get around stupid proxies). Relative URLs allow the
protocol and server name to change depending on the users' needs.

Without relativity, svn:externals' use as a substitute for
intra-repository
links is limited.

Thoughts?

-- 
Peter Davis <pediddle@pediddle.net>
Furthermore, I believe bacon prevents hair loss!
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