t>Returns</tt></i>:</span></td><td>non-negative value on success or a negative value on fail</td></tr></tbody></table></div><h3><a name="xmlC14NIsVisibleCallback" id="xmlC14NIsVisibleCallback"></a>Function type: xmlC14NIsVisibleCallback</h3><pre class="programlisting">Function type: xmlC14NIsVisibleCallback
int	xmlC14NIsVisibleCallback	(void * user_data, <br />					 <a href="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br />					 <a href="libxml-tree.html#xmlNodePtr">xmlNodePtr</a> parent)
</pre><p>