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I learned about Xpath 5 years ago, but I've really only seen enterprise usage in just the past few weeks. Therefore, I wanted to write about Xpath 2.0 and the enterprise experience. XPath 2.0 is the current version of the XPath language defined by the World Wide Web Consortium, W3C. XPath is used for selecting parts of an XML document. So it means hierarchical navigation throughout the document tree. XPath became a W3C Recommendation on 16. November 1999.
XPath 2.0 is used as a sublanguage of XSLT 2.0, and it is also a subset of XQuery 1.0. All three languages share the same data model (the XDM - XQuery and XPath Data Model).
Here I am going draw a mind map for Xpath.
Xpath axis defines a node-set relative to the current node.
|, +, -, *, =, !=, <, >, <=, => or, and, mod