takes a mandatory <b>test</b>
attribute, whose value is a boolean expression. The contents of the xsl:if element are expanded only
of the expression is true.</p>

<p>The full syntax of boolean expressions is given in <a href="expressions.html">XPath Expression Syntax</a></h3>
</p>

<p>Example:</p>
<div align="left">

<table border="1" width="100%" class="code">
  <tr>
    <td width="100%" bgcolor="#00FFFF"><font FACE="Courier New" SIZE="3"><pre>
&lt;xsl:if test=&quot;@preface&quot;&gt;
       