docs: public MessageEventDefinitionBuilder messageEventDefinition(String id) {
      MessageEventDefinition messageEventDefinition = createEmptyMessageEventDefinition();
      if (id != null) {
        messageEventDefinition.setId(id);
      }
  
      element.getEventDefinitions().add(messageEventDefinition);
      return new MessageEventDefinitionBuilder(modelInstance, messageEventDefinition);
    }