[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: What is a namespace ... really?
Roger L. Costello wrote: > Suppose that I create a DTD (BookCatalogue.dtd). In this DTD I define some > elements, attributes, entities, etc. I define the relationships between > the elements, attributes, etc. I place BookCatalogue.dtd in a directory: > > file://localhost/xml-course/xml-part1/BookCatalogue.dtd > > Is this a namespace? That is, is the file itself (BookCatalogue.dtd) a > namespace? No, not as such. To have a namespace, you must define attributes *in the document* that have the form xmlns:prefix='some URI' where "some URI" is intended to remain stable. > In all the examples that I see in the namespace spec they don't refer to a > specific file. Instead, they refer to "some place", such as: > > http://www.w3.org/TR/HTML/ > > So, perhaps the "directory" that BookCatalogue.dtd resides in is the > namespace? i.e., It can be used as such if you decide to do so. Or you can refer to the DTD itself as the namespace name. Or any URL you want; the URL does not have to refer to anything in particular. > file://localhost/xml-course/xml-part1/ This wouldn't be so useful, because it means different things on different hosts. But again, the URI is just used as a thing to compare to determine if two namespaces are the same or different. -- John Cowan http://www.ccil.org/~cowan cowan@c... You tollerday donsk? N. You tolkatiff scowegian? Nn. You spigotty anglease? Nnn. You phonio saxo? Nnnn. Clear all so! 'Tis a Jute.... (Finnegans Wake 16.5) 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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