docs: def _init_metadata(self):
          """stub"""
          self._choices_metadata = {
              'element_id': Id(self.my_osid_object_form._authority,
                               self.my_osid_object_form._namespace,
                               'choices'),
              'element_label': 'Choices',
              'instructions': 'Enter as many choices as you wish',
              'required': True,
              'read_only': False,
              'linked': False,
              'array': True,
              'default_object_values': [''],
              'syntax': 'OBJECT',
              'object_set': []
          }
          self._choice_name_metadata = {
              'element_id': Id(self.my_osid_object_form._authority,
                               self.my_osid_object_form._namespace,
                               'question_string'),
              'element_label': 'choice name',
              'instructions': 'enter a short label for this choice',
              'required': False,
              'read_only': False,
              'linked': False,
              'array': False,
              'default_string_values': [''],
              'syntax': 'STRING',
              'minimum_string_length': 0,
              'maximum_string_length': 1024,
              'string_set': []
          }
          self._multi_answer_metadata = {
              'element_id': Id(self.my_osid_object_form._authority,
                               self.my_osid_object_form._namespace,
                               'multi_answer'),
              'element_label': 'Is Multi-Answer',
              'instructions': 'accepts a boolean (True/False) value',
              'required': True,
              'read_only': False,
              'linked': True,
              'array': False,
              'default_boolean_values': ['False'],
              'syntax': 'BOOLEAN',
              'id_set': []
          }