public function map(array $params)
	{
		if (!isset($params['ientifier'])) {
			throw new MissingArgumentException('identifier');
		}

		if (!isset($params['primaryKey'])) {
			throw new MissingArgumentException('primaryKey');
		}

		if (!isset($params['format'])) {
			$params['format'] = 'json';
		}

		return $this->post('map', $params);
	}