private static function _getTagSupportForCache()
    {
        $backend = self::$_cache->getBackend();
        if ($backend instanceof Zend_Cache_Backend_ExtendedInterface) {
            $cacheOptions = $backend->getCapabilities();
            self::$_cacheTags = $cacheOptions['tags'];
        } else {
            self::$_cacheTags = false;
        }

        return self::$_cacheTags;
    }