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<h1>XSLT Functions</h1>
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<p class="intro">XQuery 1.0, XPath 2.0, and XSLT 2.0 share the same functions
library.</p>
<hr />
<h2>XSLT Functions</h2>
<p>XSLT 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.</p>
<p>The URI of the XSLT function namespace is:<br />
http://www.w3.org/2005/02/xpath-functions</p>
<p>The default prefix for the function namespace is fn:.</p>
<p><b>Tip:</b> Functions are often called with the fn: prefix, such as fn:string().
However, since fn: is the default prefix of the namespace, the function names do
not need to be prefixed when called.</p>
<p><a href="../xpath/xpath_functions.asp">The reference of all the built-in XSLT
2.0 functions is located in our XPath tutorial.</a></p>
<p>In addition, there are the following built-in XSLT functions:</p>
<table class="ex" cellspacing="0" border="1" width="100%">
<tr>
<td width="28%" valign="top"><b>Name</b></td>
<td width="72%" valign="top"><b>Description</b></td>
</tr>
<tr>
<td valign="top"><a href="func_current.asp">current()</a></td>
<td valign="top">Returns the current node</td>
</tr>
<tr>
<td valign="top"><a href="func_document.asp">document()</a></td>
<td valign="top">Used to access the nodes in an external XML document</td>
</tr>
<tr>
<td valign="top"><a href="func_elementavailable.asp">element-available()</a></td>
<td valign="top">Tests whether the element specified is supported by the XSLT processor</td>
</tr>
<tr>
<td valign="top"><a href="func_formatnumber.asp">format-number()</a></td>
<td valign="top">Converts a number into a string</td>
</tr>
<tr>
<td valign="top"><a href="func_functionavailable.asp">function-available()</a></td>
<td valign="top">Tests whether the function specified is supported by the XSLT processor</td>
</tr>
<tr>
<td valign="top"><a href="func_generateid.asp">generate-id()</a></td>
<td valign="top">Returns a string value that uniquely identifies a specified node</td>
</tr>
<tr>
<td valign="top"><a href="func_key.asp">key()</a></td>
<td valign="top">Returns a node-set using the index specified by an <xsl:key> element</td>
</tr>
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<td valign="top"><a href="func_systemproperty.asp">system-property()</a></td>
<td valign="top">Returns the value of the system properties</td>
</tr>
<tr>
<td valign="top"><a href="func_unparsedentityuri.asp">unparsed-entity-uri()</a></td>
<td valign="top">Returns the URI of an unparsed entity</td>
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