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> It's not, although by default it is. To declare child elements as
> unordered, place them in an <interleave> element.
Heh, about an hour after I posted my original post, I came across the
<interleave> node. Bravo to RelaxNG for allowing flexible node ordering.
> a) if order doesn't matter, choose one (because it doesn't matter!)
> b) if order does matter, declare the correct order
I suppose the main reason for wanting/needing unordered (or any-ordered)
elements is if you're receiving XML documents from different sources, be it
applications or users/vendors. It seems to be a serious pain to report back
to them that the document failed validation just because element "B" was
listed before element "A"...