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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>&lt;xsl:perform-sort select="//BOOK"&gt;
    &lt;xsl:sort select="author/last-name"/&gt;
    &lt;xsl:sort select="author/first-name"/&gt;
&lt;/xsl:perform-sort&gt;</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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