XML is a markup language that is a flexible method of creating and sharing data over incompatible systems, while XPath is a significant component in the XSLT standard. XPath can be used to pilot through elements and features in an XML document. XPath uses path expressions to move through XML documents. XPath contains a generous library of standard functions. XML is an extensible markup language, which is used to create other languages, recognizes a set of guidelines for encoding documents in a presentation that is readable by both humans and machines. XPath is a query language for choosing nodes from an XML document. XPath may be used to calculate values from the content of an XML document.