public function getSavedConfig($configurationName)
 {
     //$url = 'action=get&type=config&xpath=/config';
     $url = "type=op&cmd=<show><config><saved>{$configurationName}</saved></config></show>";
     $r = $this->sendRequest($url, true);
     $configRoot = DH::findFirstElement('result', $r);
     if ($configRoot === false) {
         derr("<result> was not found", $r);
     }
     $configRoot = DH::findFirstElement('config', $configRoot);
     if ($configRoot === false) {
         derr("<config> was not found", $r);
     }
     DH::makeElementAsRoot($configRoot, $r);
     return $r;
 }