static function fetchClassIdentifierListByPathString($nodePath, $withLastNode, $limit = false)
 {
     $itemList = array();
     $nodes = eZContentObjectTreeNode::fetchNodesByPathString($nodePath, $withLastNode, false, $limit);
     foreach ($nodes as $node) {
         $itemList[] = array('node_id' => $node['node_id'], 'class_identifier' => $node['class_identifier']);
     }
     return $itemList;
 }