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I foresee a time when my company will want to construct XML documents according to rules defined in distinct DTDs. Namespaces will play a part in this. But those documents will still need to be validated. The URI associated with a namespace prefix does not need to point to a DTD. Even if it does, there is no requirement in the recommendation that the DTD play any part in validation. So how do I validate my document? Do I need to create a new DTD that encompasses all of the newly-prefixed elements and attributes? This could result in a need for dozens of DTDs: a new DTD every time I aggregate someone else's XML document. Or, at the very least, dozens of external entity files. And the possibilities for namespaced attribute combinations are so numerous that constructing a content model to represent all of those possibilities seems a daunting proposition. If all of this is true, what have I really gained by the use of namespaces? Merely protection against the (rare?) possibility of a name collision? Seems like a lot of overhead to avoid what could be an infrequent problem. And if the namespace URI does point to a DTD, is there a parser that *will* use that DTD as an aid to validation of that part of the document? Thanks to anyone who wants to weigh in here ... *************************************************************************** This is xml-dev, the mailing list for XML developers. To unsubscribe, mailto:majordomo@x...&BODY=unsubscribe%20xml-dev List archives are available at http://xml.org/archives/xml-dev/ ***************************************************************************
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