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- From: email@example.com (Henry S. Thompson)
- To: "Sean B. Palmer" <firstname.lastname@example.org>
- Date: Wed, 29 Nov 2000 10:02:48 +0000
"Sean B. Palmer" <email@example.com> writes:
> > I encourage you to read the XML Schema Primer , which contains a good
> > introduction to the mechanisms by which you can associate schemas with
> > namespaces -- putting a schema document at the namespace URI is only
> > one of them. I think there's enough flexibility in the spec. to
> > accommodate your needs.
> According to 6.3.2(2):-
> "The author of a document uses namespace declarations to indicate the
> intended interpretation of names appearing therein; there may or may not be
> a schema retrievable via the namespace URI."
> Can we simply declare a namespace for a document then, and validate it using
> that namespace as a Schema URI? Is that legal? There seems to be some
> abiguity in that statement "may or may not be".
To summarise the XML Schema design in this area:
The connection between instance and schema can be established in a
number of ways:
1) An application may have a schema built in, and always use that one;
2) An application may allow a user to provide one or more schema
documents, e.g. on the command line, for use in validation;
3) An instance may contain
attributes, which in turn associate namespaces with the location
of schema documents for that namespace, and an application may
exploit this to find those documents;
4) An application may attempt to dereference namespace URIs and use
schema documents found as a result.
The XML Schema draft spec. does _not_ mandate a particular order in
which these strategies should be followed, if more than one is
supported, but does encourage processors to support all of (2) -- (4).
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
W3C Fellow 1999--2001, part-time member of W3C Team
2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
Fax: (44) 131 650-4587, e-mail: firstname.lastname@example.org