the original <a href="libxml-tree.html#xmlSAXHandlerPtr">xmlSAXHandlerPtr</a></td></tr><tr><td><span class="term"><i><tt>user_data</tt></i>:</span></td><td>a pointer to the original SAX user data pointer</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>a pointer to a data structure needed to unplug the validation layer or NULL in case of errors.</td></tr></tbody></table></div><h3><a name="xmlSchemaSAXUnplug" id="xmlSchemaSAXUnplug"></a>Function: xmlSchemaSAXUnplug</h3><pre class="