XPath expressions are used to access parts of an XML document. XPath expressions can be used with XML functions or using the access operator ([ ]) on an XML document.
For more info follow this link: http://www.w3schools.com/XPath/
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http://www.zvon.org/xxl/XPathTutorial/Output/examples.html
It starts off with simple examples and progresses to some pretty mind boggling stuff that shows how powerful XPath expressions can be.