<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>xpointer.idref</title><link rel="stylesheet" type="text/css" href="../reference.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="../index.html" title="DocBook XSL Stylesheets: Reference Documentation"><link rel="up" href="generallibrary.html" title="General Library Templates"><link rel="prev" href="string.subst.html" title="string.subst"><link rel="next" href="idref.html" title="idref"><link rel="copyright" href="copyright.html" title="License"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">xpointer.idref</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="string.subst.html">Prev</a> </td><th width="60%" align="center">General Library Templates</th><td width="20%" align="right"> <a accesskey="n" href="idref.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="xpointer.idref"></a><div class="titlepage"></div> <div class="refnamediv"><h2>xpointer.idref</h2><p> xpointer.idref — Extract IDREF from an XPointer </p></div> <div class="refsect1"><a name="idp9507872"></a><h2>Description</h2> <p>The <code class="function">xpointer.idref</code> template returns the ID portion of an XPointer which is a pointer to an ID within the current document, or the empty string if it is not.</p> <p>In other words, <code class="function">xpointer.idref</code> returns <span class="quote">“<span class="quote">foo</span>”</span> when passed either <code class="literal">#foo</code> or <code class="literal">#xpointer(id('foo'))</code>, otherwise it returns the empty string.</p> <a name="xpointer.idref.frag"></a><pre class="programlisting"> <xsl:template name="xpointer.idref"> <xsl:param name="xpointer">http://...</xsl:param> <xsl:choose> <xsl:when test="starts-with($xpointer, '#xpointer(id(')"> <xsl:variable name="rest" select="substring-after($xpointer, '#xpointer(id(')"></xsl:variable> <xsl:variable name="quote" select="substring($rest, 1, 1)"></xsl:variable> <xsl:value-of select="substring-before(substring-after($xpointer, $quote), $quote)"></xsl:value-of> </xsl:when> <xsl:when test="starts-with($xpointer, '#')"> <xsl:value-of select="substring-after($xpointer, '#')"></xsl:value-of> </xsl:when> <!-- otherwise it's a pointer to some other document --> </xsl:choose> </xsl:template> </pre> </div> </div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="string.subst.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="generallibrary.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="idref.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">string.subst </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> idref</td></tr></table></div></body></html>