[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Namespace URI address resources
On Mon, 31 May 1999, Paul Prescod wrote: > Tim Bray wrote: > > > > No, that's not a "formal logic" change, that's a huge basic semantic > > change. If the IETF had wanted to forbid people using these for > > other purposes, they should say so. > > Okay, fine: > > "A Uniform Resource Identifier (URI) is a compact string of characters for > identifying an abstract or physical resource." > > Normatively referenced RFC 2396: http://www.faqs.org/rfcs/rfc2396.html > > You can also read the section that begins "URI are characterized by the > following definitions." > > Paul's Fudamantal Law of URIs (PFLU): If a string does not identify a > resource then it not a URI. A string can be 'for' identifying an (abstract or physical) resource without any URI-string to resource bindings currently being in effect. <URI:urn:fictional:purl.org/net/danbri:pagesonmysiteaboutsociology> for example, might be a URI whose purpose is to identify an abstract resource which is a set of documents on my server about a specific topic. This seems a reasonable use of an identifier. Seems odd to say that the string stops being a URI for those periods when no documents fall into the appropriate category. BTW this has all been much discussed on the WebDAV WG recently. See archives at http://lists.w3.org/Archives/Public/w3c-dist-auth/1999AprJun/ for details, in particular the BIND Proposal thread. In general, I see no problem with a server managing a resource but (at some point in time) there being no generally agreed binding from a URI to that resource. At other points in time there might be several. The would-be-indentifying string remains a URI regardless. If... > "A Uniform Resource Identifier (URI) is a compact string of characters for > identifying an abstract or physical resource." ...read "string of characters _which_ identify an..." the situation would be different. As things stand the definition is about intent, not whether the URI does currently identify any resources. Dan -- Daniel.Brickley@b... Institute for Learning and Research Technology http://www.ilrt.bris.ac.uk/ University of Bristol, Bristol BS8 1TN, UK. phone:+44(0)117-9287096 xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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