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Tyler Baker scripsit: > Does this mean that you need to have the entire document parsed before > you can make the check that the value of the ID matches the ID of some > element in the document? Yes. > If this is true, then for validating parser implementations you will > first need to build an in memory parse tree using a non-validating > parser and then validate the document by recursively traversing the > parse tree. Not really. All you need to keep is a list of IDs and IDREFs seen so far. At the end of the document, they had better pair up correctly. > I am not an SGML expert, so maybe someone here can give me some > historical reason for why the XML spec needs to have ID's or at least > ID's that have not previously been declared in the document when an > IDREF is encountered. The whole point of ID and IDREF is to have a simple intra-document link, so that documents that have non-hierarchical natural structures can be fitted into SGML/XML hierarchies. For that requirement, forward references and even loops are sometimes essential. -- John Cowan cowan@c... e'osai ko sarji la lojban. 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/ 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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