The spec: http://www.w3.org/TR/xpath

 * http://xpath.alephzarro.com/content/cheatsheet.html#chXPath
 * DeepX ref at http://refcards.com/docs/deepx/xpath/XPath-1.0.pdf or http://www.digilife.be/quickreferences/QRC/XML%20Path%20Language%201.0.pdf
 * http://www.topxml.com/xsl/XPathRef.asp

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CategoryCheatSheet