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As part of the ISO DSDL effort (which is putting together a modular framework for schema/validation languages, aiming to provide a complement and alterative to DTDs and W3C XML Schemas) I have been tasked with compiling a critique of XML Schemas Datatypes. (See A. Lewis' "Not my Type" article at http://www.xml.com/pub/a/2002/07/31/wxstypes.html?page=1 for an interesting set of comments.) The particular issues this critique will feed into is * whether ISO DSDL should adopt WXS datatypes holus bolus, just the primitives or builtins, some restricted set, or develop its own; * whether ISO DSDL should adopt the apparatus of facets; * whether ISO DSDL should also adopt the apparatus of type derivation used with the XML Schemas datatypes; * whether ISO DSDL should specify some additional primitives to augment where XML Schemas is weak; * what should ISO DSDL do about references; * what should ISO DSDL do about time. So can I invite responses from XML-DEV for this. I guess I am not so much interested in "gDate [expletive deleted]" comments as much as I am in "I wanted or expected or needed to do XXX but I could only do YYY". In other words, practical problems that people want to fix. ISO DSDL has a bias towards publishing requirements, but this is quite broad and includes web forms validation as well as books. I have been reviewing industry-standard DTDs in the publishing industry to see what kinds of datatypes are required. Also, please note that people with problems with existing XML Schemas datatypes might care to email the XML Schema comments list. The W3C XML Schema Working Group is working very hard to address the particular issues that people raise, within the WXS framework. Cheers Rick Jelliffe
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