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XML schema actually does more than validation: it can also
annotate and augment the document with type information, making it easier to
process.
But if validation is your concern, it's the general
principle of software engineering: software components should define their
interfaces and at least be capable of failing cleanly if the constraints on the
interface are not satisfied.
If you have full trust between the components either side
of an interface then validation may be unnecessary. But experience suggests that
if you trust another piece of software to do the right thing then eventually you
will find your trust is misplaced.
Michael Kay
http://www.saxonica.com/
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