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- From: John Cowan <cowan@locke.ccil.org>
- To: XML Dev <xml-dev@ic.ac.uk>
- Date: Fri, 15 Jan 1999 09:51:28 -0500
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@ccil.org
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)
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