[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Namespaces and URNs
I would appreciate guidance from people knowledgeable in URN syntax and use. (A) The NS draft gives an example as xmlns='urn:loc.govs:books' but a private correspondent tells me than URNs should be of the form urn:scheme:something - so unless loc.gov is a scheme there appear to be differences of opinion. (B). I would greatly value consistency in the use of standard URNs. The only way we can implement interoperability is if everyone uses the same URN to refer to a namespace. Since the URN need not represent a real WWW resource there is very little check on whether a URN is fictitious. The draft shows an example of this problem. HTML is referenced mainly through the string: http://www.w3.org/TR/REC-html40 This seems fine to me, but later (5, box 6) it is referenced by: urn:w3-org-ns:HTML Are these equivalent? If so, there must be a central registry of synonyms somewhere. And, if so, it places a great burden on implementers who must search the WWW for all possible equivalences. I would *much* prefer that the whole world used exactly the same string for the namespace for HTML4.0. Experience with HTML has not helped the cause of unique identifiers for DTDs. I suspect that there are zillions of different (F)PIs in the HTML DOCTYPE statements round the world. And - unless I'm told different - I suspect no software actually processed them. So we are going into an era where we have to convince authors that NS URNs are critically important - they can't just guess and hope. I'd like to suggest that people who really know post the authoritative URNs for common DTDs/schemas. And that we all stick to using the correct one in all our examples. Among the ones we shall need in many namespace examples are: HTML (including version) IBTWSH XSchema MathML (a useful example) DublinCore RDF XML-Data Having developed 2 DTDs (CML and VHG) I need to know how to prepare URNs for them. It seems clear that anyone wishing to create a DTD which can be used for Namespaces has to buy/borrow a domain name. (I suppose they could buy an FPI instead, but since I already have domain names I'd prefer to stick with those). P. Peter Murray-Rust, Director Virtual School of Molecular Sciences, domestic net connection VSMS http://www.nottingham.ac.uk/vsms, Virtual Hyperglossary http://www.venus.co.uk/vhg 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/ 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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