function modify(&$tpl, &$operatorName, &$operatorParameters, &$rootNamespace, &$currentNamespace, &$operatorValue, &$namedParameters)
 {
     switch ($operatorName) {
         case 'class_attributes':
             $operatorValue = $this->getClassAttributes($namedParameters['params']);
             break;
         case 'organigramma':
             $nodeID = $namedParameters['node_id'];
             $operatorValue = PatOrganigramma::getOrganigrammaTree($nodeID);
             break;
         case 'http_header':
             echo 'ciao';
             die;
             $header = $namedParameters['header'];
             $status_code = $namedParameters['status_code'];
             if ($status_code != 0) {
                 header($header, true, $status_code);
             } else {
                 header($header);
             }
             $operatorValue = '';
             break;
     }
 }