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<h1>xsl:perform-sort</h1>
<p>The <code>xsl:perform-sort</code> instruction takes a sequence as its input and
produces a sorted sequence as its output.</p>
<p>The input sequence may be specified either using the <code>select</code> attribute, or using the
instructions contained within the <code>xsl:perform-sort</code> instruction.</p>
<p>The sort criteria are specified using <code>xsl:sort</code> elements as children of
<code>xsl:perform-sort</code>, in the usual way.</p>
<p>For example:</p>
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<code><xsl:perform-sort select="//BOOK">
<xsl:sort select="author/last-name"/>
<xsl:sort select="author/first-name"/>
</xsl:perform-sort></code>
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<p>It's often useful to use <code>xsl:perform-sort</code> inside a stylesheet function; the function
can return the sorted sequence as its result, and can be invoked directly from an XPath expression.</p>
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