docs: def add_choice(self, text, inline_region, name='', identifier=None):
          """stub"""
          choice_display_text = self._choice_text_metadata['default_string_values'][0]
          choice_display_text['text'] = text
          if identifier is None:
              identifier = str(ObjectId())
          choice = {
              'id': identifier,
              'text': text,
              'name': name
          }
          if inline_region in self.my_osid_object_form._my_map['choices']:
              self.my_osid_object_form._my_map['choices'][inline_region].append(choice)
          else:
              raise IllegalState('that inline region does not exist')
          return choice