docs: def set_text(self, text=None):
          """stub"""
          if text is None:
              raise NullArgument()
          if self.get_text_metadata().is_read_only():
              raise NoAccess()
          if not self.my_osid_object_form._is_valid_string(
                  text,
                  self.get_text_metadata()):
              raise InvalidArgument()
          self.my_osid_object_form._my_map['text']['text'] = text