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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, if any. 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. MB -- Mark Baker, Chief Science Officer, Planetfred, Inc. Ottawa, Ontario, CANADA. mbaker@p... http://www.markbaker.ca http://www.planetfred.com
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