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copied!<p>My current list (compiled from web search results and the other answers) is:</p> <ul> <li><a href="http://code.google.com/p/xpath4sax/" rel="nofollow">http://code.google.com/p/xpath4sax/</a></li> <li><a href="http://spex.sourceforge.net/" rel="nofollow">http://spex.sourceforge.net/</a></li> <li><a href="https://github.com/santhosh-tekuri/jlibs/wiki/XMLDog" rel="nofollow">https://github.com/santhosh-tekuri/jlibs/wiki/XMLDog</a> (also contains a performance chart)</li> <li><a href="http://www.cs.umd.edu/projects/xsq/" rel="nofollow">http://www.cs.umd.edu/projects/xsq/</a> (uniersity project, dead since 10 years, GPL)</li> <li>MIT-Licensed approach <a href="http://softwareengineeringcorner.blogspot.com/2012/01/conveniently-processing-large-xml-files.html" rel="nofollow">http://softwareengineeringcorner.blogspot.com/2012/01/conveniently-processing-large-xml-files.html</a></li> <li>Other parsers/memory models supporting fast XPath: <ul> <li><a href="http://vtd-xml.sourceforge.net/" rel="nofollow">http://vtd-xml.sourceforge.net/</a> ("The world's fastest XPath 1.0 implementation.")</li> <li><a href="http://jaxen.codehaus.org/" rel="nofollow">http://jaxen.codehaus.org/</a> (contains <a href="http://www.saxpath.org/" rel="nofollow">http://www.saxpath.org/</a>)</li> <li><a href="http://www.saxonica.com/documentation/sourcedocs/streaming/streamable-xpath.html" rel="nofollow">http://www.saxonica.com/documentation/sourcedocs/streaming/streamable-xpath.html</a></li> </ul></li> </ul> <p>The next step is to use the examples of XMLDog and compare the performance of all these approaches. Then, the test cases should be extended to the supported XPath expressions.</p>

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