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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Does DTD validation work with namespaces?
/ Amy Lewis <amyzing@t...> was heard to say:
[...]
| A treatise combining elements of mathematics, chemistry, with
| illustrations and bibliographic information can't be written?
Sure it can. But if I was doing it, I'd want a combination of schemas
(XML Schemas, DTDs, whatever) that defined what the legitimate
combination of vocabularies was. I don't see how to validate
documents, in any meaningful sense, otherwise.
Is this valid?
<docbook:para>This is some text
<html:i>with emphasis</html:i>
</docbook:para>
Well, I suppose if your processing model is that all things not in
your namespace are ignored, then it is. But if I was writing
stylesheets, or software to do semantic indexing, or any other
application I can think of, it wouldn't be meaningful validity.
Consider this:
<docbook:para>This is some text
<html:i>with emphasis <docbook:inlinemediaobject>
<docbook:imageobject><docbook:imagedata fileref="foo.png"/>
</docbook:imageobject></docbook:inlinemediaobject></html:i>
</docbook:para>
If you don't constrain how vocabularies are mixed, it just becomes
hopelessly messy.
If you want ANY, you have the DTD "ANY" content model and XML Schemas
gives you finer control. I could write an XML schema, for example,
that said that the content model of "equation" was a couple of DocBook
elements or anything from the MathML or SVG namespaces. (But not from
arbitrary other namespaces).
| SVG, at least, is intended for inclusions, rather than for the creation
| of standalone documents; is this inclusion only via XInclude/XLink?
No, but in DocBook it'll only be allowed inside <mediaobject> and
<inlinemediaobject>. Just because it's intended for inclusion, doesn't
mean that it makes sense to include it *anywhere*.
| Or could I create a grand-unifying DTD for work in the field of
| statistical chemistry (say) that, by importing the domain-specific DTDs
| for mathematics, chemistry, graphics, bibliographies, and general
| document-oriented text, permitted all of these elements, in some
| specified (to whatever degree of specificity) order?
That's what I'd do. Although I think exactly how is by no means a
question that we have a complete and satisfactory answer for at this
time.
| Or must I say, "Nope, can't do that," and "just" do XHTML?
No! :-)
Be seeing you,
norm
--
Norman.Walsh@E... | One's never alone with a rubber duck.
XML Technology Center |
Sun Microsystems, Inc. |
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