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> Which is perfectly fine... the question though is how do I refer to a
> *specific* digtal resource reliably, such that I can always retrieve a
> represenation that it is a copy of the original resource? Using a URI,
> how can I reliably point to foo.gif?
Use the URI provided in the Content-Location header of the response,
From RFC 2616, Sec 14.14;
"A server SHOULD provide a Content-Location for the
variant corresponding to the response entity; especially in the case
where a resource has multiple entities associated with it, and those
entities actually have separate locations by which they might be
individually accessed, the server SHOULD provide a Content-Location
for the particular variant which is returned."
If a specific URI for the representation isn't provided, then your
only choice is for you to identify it yourself by hanging that content
off of your own web server.
Mark Baker, Chief Science Officer, Planetfred, Inc.
Ottawa, Ontario, CANADA. email@example.com