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> Shouldn't it be the case that the validation process necessitates > a 2-stage parsing ? What I mean is that XSD can only do a lexical > validation, a second follow-up stage that validates against the > application semantics is required. That's actually four levels already: unicode encoding, XML well-formedness, schema validity, and application validity. And yes, you often need multiple levels. But that doesn't stop you wanting individual levels to be configurable. A very simple example, when I validate new documents I want to check that the date is today. That kind of thing is very easily achieved by a configurable schema. Equally, the application-level validation is often done using XSLT stylesheets, and people often transform stylesheets for the same reason: you need things to be configurable at that level too. Michael Kay
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