Re: Does DTD validation work with namespaces?
/ Wayne Steele <xmlmaster@h...> was heard to say: | I think you are mistaken. | The kind of mixing of DTDs that you're discussing is perfectly legal and | acceptable with XML 1.0. | | If I declare | <!ELEMENT foo (#PCDATA)* > | <!ELEMENT FooList ( foo )+ > | | There is _NO_ constraint that foo elements only appear inside FooList | elements. True, but it is a constraint that only foo elements occur inside a FooList. | I could quite legally have <!DOCTYPE foo ... > in my document. | I could also have an internal subset, that declares | <!ELEMENT FooBarList ( foo | bar )* > | and then mix foo elements side-by-side with bar elements. Nope, you couldn't. That would violate the "Unique Element Type Declaration" validity constraint. You could get the desired effect with appropriate parameter entities, though, so nevermind :-) | As long as names don't clash, there should be no problem. | If something in dtd1 had a content model on "ANY", I can now take any element | I choose from dtd1 or dtd2, and stick it in there. Right, but explicitly because you used the content model ANY in dtd1. If dtd1 declares <!ELEMENT FooList ( foo )+ > and dtd2 declares my:foo, you *cannot* say: <FooList><my:foo/></FooList> | DTD Validation is intended to allow documents to specify the model and | constraints they adhere to, not to force documents to conform to some outside | spec. Those are two sides of the same coin, aren't they? A document conforms to the constraints that it claims to adhere to if and only if it conforms to the DTD (outside spec) that defines the constraints. | 2. XML Documents can always override or add their DTDs with an internal | subset. In practice, this requires that the external subset DTD be defined with appropriate parameter entities. | 3. A DTD cannot specify what the "root" or Document Element, or "DOCTYPE" | should be. An XML document can declare itself to be any element that is | defined in the DTD. Yeah, but I don't see how that's relevant. Be seeing you, norm -- Norman.Walsh@E... | Great men too make mistakes, and many among XML Technology Center | them do it so often that one is almost Sun Microsystems, Inc. | tempted to call them little | men.--Lichtenberg
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