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Thanks, David for the insights. looking at the following section of XML 1.0 fifth edition specification, http://www.w3.org/TR/2008/REC-xml-20081126/#proc-types "Validating and Non-Validating Processors" The spec seems to suggest that XML documents are valid only if a DTD is associated with the XML document. But I think, that's not entirely true given that XSD is also another XML validation language from W3C XML activity. I don't mind validating XML documents with other technologies like RelaxNG or Schematron, if there is a need for me to do so. But I think, existence of technologies like RelaxNG or Schematron cannot be an excuse for XML spec, not to mention XSD within it as a validating technology. On Sun, Nov 8, 2009 at 9:01 PM, David Carlisle <davidc@n...> wrote: > essentially for the same reason that XSD should not be referenced from > the xml spec. XSD (like Relax NG, XSLT etc) all work on the infoset > produced by parsing an XML document, thus they require an XML parser to > provide them input, to expand entities etc. > > DTD processing on the other hand does not work by taking an infoset as > input but is instead a modified parser that reports validation outcomes. > > XSD can not define entities as it is too late in the chain. If the > document uses entity references that are not defined to the parser then > the document is in error (or not well formed if there is no external DTD > reference at all). -- Regards, Mukul Gandhi
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