Tim Bray: often caution people against relying too heavily on schema validation. âAfter all,â I say, âthere is lots of obvious run-time checking that schemas canât do, for example, verifying a part number.â It turns out I was wrong; with a little extra work, you can wire in part-number validationâor pretty well anything elseâto RelaxNG. Elliotte Rusty Harold explains how.
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