[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XML Schema: At Least One of X Elements Must Appear
From: "Henry S. Thompson" <ht@c...> > 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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