public static function delete($domain_name, $item_name)
 {
     SimpleDbPersister::init();
     $client = SimpleDbClient::factory(array('key' => SimpleDbPersister::$AWS_KEY, 'secret' => SimpleDbPersister::$AWS_SECRET_KEY, 'region' => SimpleDbPersister::REGION));
     $result = $client->deleteAttributes(array('DomainName' => $domain_name, 'ItemName' => $item_name));
     return $result;
 }