function cachedTemplateTree($keyData, $uri, $res, $templatePath, &$extraParameters, $timestamp)
 {
     $key = $this->cacheKey($keyData, $res, $templatePath, $extraParameters);
     if (eZTemplateTreeCache::canRestoreCache($key, $timestamp, $templatePath)) {
         eZTemplateTreeCache::restoreCache($key, $templatePath);
     }
     return eZTemplateTreeCache::cachedTree($key, $uri, $res, $templatePath, $extraParameters);
 }