См. также: http://raml.org/spec.html#responses
Наследование: implements raml\ArrayInstantiationInterface, implements raml\MessageSchemaInterface
 /**
  * Add a response
  *
  * @param Response $response
  */
 public function addResponse(Response $response)
 {
     $this->responses[$response->getStatusCode()] = $response;
 }