xpointer.idref
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## xpointer.idref

xpointer.idref — Extract IDREF from an XPointer

## Description

The `xpointer.idref` 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.

In other words, `xpointer.idref` returns “foo” when passed either `#foo` or `#xpointer(id('foo'))`, otherwise it returns the empty string.

    <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>

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