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From: "Henry S. Thompson" <ht@cogsci.ed.ac.uk>
> You guys are all forgetting your history! At least one of {a, b, c},
> in any order, is expressible in DTD, and therefore _a posteriori_ in
> W3C XML Schema:
>
> <!ELEMENT x ((a,((b,c?)|(c,b?))?)|(b,((a,c?)|(c,a?))?)|(c,((a,b?)|(b,a?))?))>
>
> It's certainly not elegant, and it gets worse as the number of
> alternatives goes up, but it's not impossible.
Is that what he was asking for? He said
"at least one of the following X elements must appear in the XML document"
not
"at least one of the following X elements must appear in an element"
Cheers
Rick Jelliffe
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