XPath 1.0 supported only four data types, XPath 2.0 extends that to support not only the node kinds supported in XPath 1.0, but also many atomic types, which include the primitive simple types defined by the XML Schema specification and values whose types are derived from them by restriction in a schema.
More articles by Steven Holzner
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Here is your chance to dive into the code of XPath 2.0.
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