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XML Path Language (XPath) Version 1.0 - http://www.w3.org/TR/xpath
Official W3C site describing this language for addressing parts of an XML document which is designed to be used by both XSLT and XPointer. (W3C Recommendation 16 November 1999)
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Schematron - http://xml.ascc.net/resource/schematron/schematron.html
A tree-pattern schema language built on top of XSL with XPath.
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DOM Level 3 XPath Specification - http://www.w3.org/TR/DOM-Level-3-XPath/
Provides simple functionalities to access a DOM tree using XPath 1.0. This module builds on top of the Document Object Model Level 3 Core. [W3C Working Draft 31 October 2001]
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Zvon: XPath Tutorial - http://www.zvon.org/xxl/XPathTutorial/General/examples.html
A tutorial with several examples and pictures which can be downloaded for off-line use.
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W3 Schools XPath - http://www.w3schools.com/xpath/
Tutorial which covers syntax, locations, expressions, functions and examples.
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XPath Package for OCaml - http://alain.frisch.fr/soft#xpath
This package implements the full W3C XPath recommendation for the OCaml language; it may work with the output of PXP (XML parser), or with any implementation of the XPath data model.
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Stylus Studio: XPath Tools - http://www.stylusstudio.com/xpath.html
Tools for editing, generating and testing XPath 1.0 and XPath 2.0 expressions.
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DecisionSoft - Pathan - http://software.decisionsoft.com/
XPath compliant parsing and evaluation module for the Xerces-C, allows arbitrary selection of nodes from an XML document.
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A mini xpath processor - http://minixpath.sourceforge.net
An XPath processor built for J2ME, suitable for mobile phones.
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