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   RE: [xml-dev] status of "collections" in XPath / XQuery

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What is the status of defining "collections" in XPath or XQuery?  The use cases specified by W3C seem to be more
at the "collection" level than specific documents.  It seems that each book in a bibliographies document is better
modeled as a document in a collection called "bibliographies". 
As it happens, it's a hot topic of discussion in the WG right now. Proposals are still at a fairly early stage. 
Is there thought going on regarding constraints on collections (when they are defined)?  I may want to have all
invoice numbers in a collection be unique. 
I haven't seen any proposals that address that. Certainly, XML Schema doesn't provide any cross-document validation.
Mike Kay 


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