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There are many different possible tree models for XML. The deeper you look the more differences you find between DOM, the XML Infoset, XPath 1.0, XPath 2.0, and other tree-based data models. But it doesn't stop there. There are non-tree-based models of XML documents, and these may also be profitably used in the right circumstances. XML is defined such that it is possible to represent a well-formed document as a tree. It is by no means necessary to do so. SAX exposes probably the most popular non-tree model, but it's hardly the only one. Indeed there are non-event, non-tree models as well. Some people have shredded XML documents into relational tables. That works too. None of these models are more correct than any of the others. It's simply a question of which is most useful for the problem at hand given the available tools. -- Elliotte Rusty Harold elharo@m... XML in a Nutshell 3rd Edition Just Published! http://www.cafeconleche.org/books/xian3/ http://www.amazon.com/exec/obidos/ISBN=0596007647/cafeaulaitA/ref=nosim
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