code: def set_id(self, value):
          
          if value is None:
              self.__id = value
          if not isinstance(value, str):
              raise TypeError("ID must be set to a String")
          else:
              self.__id = value
docs: Setter for 'id' field.
          :param value - a new value of 'id' field. Must be either None (ID is optional according to BPMN 2.0 XML Schema)
          or String type.