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[Nicolas LEHUEN] ... Plus, of course, the child object can add a new method which gives access to the new data model, and this method will be used by callers that rely on the new schema. That's why I believe OOP can provide useful insights in bringing the X to XML. [me] No argument from me about this. Remember, though, that we can remove structures that are in ancestor types and elements when we derive new ones - XML Schema supports doing so, for example - which we can't with standard OO methodologies. In this way, XML markup can be considered richer than OO modeling. Cheers, Tom P
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