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<h1>XPath Introduction</h1>
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<p class="intro">XPath is a language for finding information in an XML document.
XPath is used to navigate through elements and attributes in an XML document.</p>
<hr />
<h2>What You Should Already Know</h2>
<p>Before you continue you should have a basic understanding of the following:</p>
<ul>
<li>HTML / XHTML</li>
<li>XML / XML Namespaces</li>
</ul>
<p>If you want to study these subjects first, find the tutorials on our
<a href="../default.asp">Home page</a>.</p>
<hr />
<h2>What is XPath?</h2>
<ul>
<li>XPath is a syntax for defining parts of an XML document</li>
<li>XPath uses path expressions to navigate in XML documents</li>
<li>XPath contains a library of standard functions</li>
<li>XPath is a major element in XSLT</li>
<li>XPath is a W3C Standard</li>
</ul>
<hr />
<h2>XPath Path Expressions</h2>
<p>XPath uses path expressions to select nodes or node-sets in an XML document. These path
expressions look very much like the expressions you see when you work with a
traditional computer file system.</p>
<hr />
<h2>XPath Standard Functions</h2>
<p>XPath includes over 100 built-in functions. There are
functions for string values, numeric values, date and time comparison, node and QName
manipulation, sequence manipulation, Boolean values, and more.<br />
</p>
<hr />
<h2>XPath is Used in XSLT</h2>
<p>XPath is a major element in the XSLT standard. Without XPath knowledge you will not be able to create XSLT documents.</p>
<p>You can read more about XSLT in our <a href="../xsl/default.asp">XSLT
tutorial</a>.</p>
<p>XQuery and XPointer are both built on XPath expressions. XQuery 1.0 and XPath 2.0 share the same
data model and support the same functions and operators. </p>
<p>You can read more about XQuery in our <a href="../xquery/default.asp">XQuery
tutorial</a>.</p>
<hr />
<h2>XPath is a W3C Standard</h2>
<p>XPath became a W3C Recommendation 16. November 1999.</p>
<p>XPath was designed to be used by XSLT, XPointer and other XML parsing
software.</p>
<p>You can read more about the XPath standard in our
<a href="../w3c/default.asp">W3C
tutorial</a>.</p>
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