!!! Overview
XPath, the XML Path Language, is a query language for selecting nodes from an XML document. In addition, XPath may be used to compute values (e.g., strings, numbers, or Boolean values) from the content of an XML document. XPath was defined by the World Wide Web Consortium (W3C).

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }] 
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* [#1] - [XPath|https://en.wikipedia.org/wiki/XPath|target='_blank'] - based on information observed on 2014-08-19