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        <div class="refsect2" lang="en"><h3><a name="xmlExpIsNillable"/>xmlExpIsNillable ()</h3><pre class="programlisting">int	xmlExpIsNillable		(<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp)<br/>
</pre><p>Finds if the expression is nillable, i.e. if it accepts the empty sequqnce</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>exp</tt></i>:</span></td><td>the expression</td></tr><tr><td><span class="term"><i><