ass="term"><i><tt>Returns</tt></i>:</span></td><td>a new expression or NULL in case of failure</td></tr></tbody></table></div></div>
        <hr/>
        <div class="refsect2" lang="en"><h3><a name="xmlExpRef"/>xmlExpRef ()</h3><pre class="programlisting">void	xmlExpRef			(<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp)<br/>
</pre><p>Increase the <a href="libxml2-SAX.html#reference">reference</a> count of the expression</p>
<div class="variablelist"><table border="0"><col align="l