/**
* Appends the child node to existed node, identified by $parentId
* $pos points a position
* AT_END - at the end of children list
* AT_BEGIN - at the beginig of children list
*
* @param int $parentId
* @param array|Axis_NSTree_Node $data
* @return Axis_NSTree_Node
*/
public function appendChild($parentId, $data, $pos = self::AT_END)
{
$newId = $this->_table->allocChild($parentId, $pos);
return $this->_bindNode($newId, $data);
}
