Singletons in a DTD
I have an element which can contain 0 or more instances of some element types (call these collections), and 0 or 1 instances of others (call these singletons), and I don't want to contrain the order. If I have collections C1, C2, C3 and I have singletons S1, S2, S3 And I declare: (S1? , S2? , S3? , (C1 | C2 | C3)*) Then the singletons, if they appear, would have to be in that order and would have to be first. So that's not what I want. I suppose I could declare some combinatorics: ( S1? | S2? | S3? | (S1 , S2)? | (S2 , S1)? | (S1 , S3)? blah blah blah but I'd have to mix in the C1, C2, C3, etc., too, and I have about 8 singleton classes, so this would quickly get totally out of control. Am I missing something, or is what I want to describe not really practical in a DTD? I'm perfectly comfortable leaving the singletonness out of my DTD (my application will detect duplication errors anyway), if that's the only answer. But if there *is* a way to capture this without waiting for XSchema to be finished, I'd love to hear it! -Joshua Smith xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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