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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