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RE: [xml-dev] dynamically generated XML Schema?! Re: [xml-dev] R: [xml-dev] Number of active public XML schemas

From: "Michael Kay" <michael.h.kay@--------.--->
To: "'TAN Kuan Hui'" <kuanhui@---------.--->,"'Burak Emir'" <Burak.Emir@----.-->,"'Chizzolini Stefano'" <chist@---.-->
Date: 11/4/2004 9:56:00 AM
> 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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