Xpath Overview

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XXPPAATTHH OOVVEERRVVIIEEWW http://www.tutorialspoint.com/xpath/xpath_overview.htm Copyright © tutorialspoint.com XSL Before learning XPath, we should first understand XSL which stands for EXtensible Stylesheet Langauge. It is similar to XML as CSS is to HTML. Need for XSL In case of HTML document, tags are predefined such as table, div, span and browser knows how to add style to them and display them using CSS styles. But in case of XML document, tags are not predefined. In order to understand and style an XML document, World Wide Web Consortium W3C developed XSL which can act as XML based Stylesheet Language. An XSL document specifies how a browser should render an XML document. Following are the main parts of XSL. XSLT - used to transform XML document into various other types of document. XPath - used to navigate XML document. XSL-FO - used to format XML document. What is XPath The XPath is an official recommendation of the World Wide Web Consortium W3C. It defines a language to find information in an XML file. It is used to traverse elements and attributes of an XML document. XPath provides various types of expressions which can be used to enquire relevant information from the XML document. Structure Definations - XPath defines the parts of an XML document like element, attribute, text, namespace, processing-instruction, comment, and document nodes Path Expressions XPath provides powerful path expressions select nodes or list of nodes in XML documents. Standard FunctionsXPath provides a rich library of standard functions for manipulation of string values, numeric values, date and time comparison, node and QName manipulation, sequence manipulation, Boolean values etc. Major part of XSLTXPath is one of the major elements in XSLT standard and is must have knowledge in order to work with XSLT documents. W3C recommendationXPath is official recommendation of World Wide Web Consortium W3C. Features XPath is core component of XSLT standard. XSLT can not work without XPath. XPath is basis of XQuery and XPointer. Loading [MathJax]/jax/output/HTML-CSS/fonts/TeX/fontdata.js.

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