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Sams Teach Yourself XML in 10 Minutes by Andrew H. Watt

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W3C XML Data Models

XML documents follow the syntax rules of well-formedness but also represent data objects that have a hierarchical structure. The hierarchical structure must exist for each XML document, given that there is a document entity within which the prolog (if it exists), the document element, and all other elements exist. The simplest hierarchy for a well-formed XML document is a document entity with a single document element contained inside it.

The World Wide Web Consortium has produced three families of specifications that express, in different ways, the logical structure of an XML document: the Document Object Model, the XML Path Language, and the XML Information Set.

The Document Object Model

The Document Object Model (DOM) ...

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