[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Namespaces and URNs
At 19:25 04/08/98 -0700, Charles Frankston wrote: > >Note that the examples in the namespace paper are intended to be just that >-- hypothetical examples. That doesn't mean that the URNs used in the >examples have actually been registered -- they certainly have not. However, Thanks. Understood. [...] >Again, the examples are meant to be examples, and need not be consistent >among themselves. As John Cowan pointed out URNs, if and when they are >widely supported, are clearly the best solution for the persistent unique >names of XML namespaces. Unfortunately, URNs don't really exist yet, and in >interim URLs or other URIs can be used. I had assumed that the widespread use of urn: in XML-related drafts meant that it was a usable approach. I have kept hearing that URNs aren't quite ready - sounds like we are still some way away. > [...] > >I think you're confusing URNs with URI schemas. All URNs use one schema: >"URN". This list you show above would indicate that you're interested in >defining standard URNs for some popular namespaces. While this isn't a bad >idea, I think it will ultimately be hopeless to take on the task of tracking >all interesting namespaces. The namespace spec must allow for the use of I wasn't planning to track all of them. I was suggesting that *during the prototyping of XML-names tools* we were publicly consistent. Thus is someone writes a namespace tool to deal with HTML4.0 there needs to be a way for them to communicate exactly what version of HTML is meant. And we all have to use the same string. Because that string is the only point of having namespaces which extend beyond the document. So if we are serious about making namespaces work we need to start using the same strings to refer to the same namespace. I agree that that means that DTD owners/maintainers need to be involved. Since most of the common DTDs are within the remit of the W3C, they should be thinking of how to identify them in namespaces. If they want to use FPIs, fine. But they should make it clear which the FPIs *are* and use them consistently. If they want to use URLs instead - fine. But they shouldn't encourage the use of both simultaneously. [...] >> >> 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. > >Well, you could try to be the first on your block to register a URN, if you >could find who to register it with. Doesn't sound very hopeful. My best strategy appears to by to put a large notice on the CML web-site saying: "The namespace URL (or should that be URI?) for referring to CML1.0 should be: 'http://www.xml-cml.org/xmlns/cml10'. This is the only appropriate string to use as an xmlns attribute value to identify CML1.0. Anyone writing software to process CML documents should use this string to identify whether the author intends to map the namespace onto CML1.0. No other string should be used to identify CML1.0 in an XML document, even if CML resources are mounted on a different server. [By the way, the URL doesn't actually point to an existing resource ... ]" If you think this is a good idea, my suggestion is now that the 'DTD owners' of the other namespaces did something similar. If we don't start getting formal about namespace names at this stage people won't take the process very seriously. 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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