code: def _init_metadata(self):
          
          self._min_time_value = None
          self._max_time_value = None
          self._time_value_metadata = {
              'element_id': Id(self.my_osid_object_form._authority,
                               self.my_osid_object_form._namespace,
                               'time_value'),
              'element_label': 'Time Value',
              'instructions': 'enter a time duration string / duration',
              'required': False,
              'read_only': False,
              'linked': False,
              'array': False,
              'default_duration_values': [{
                  'hours': 0,
                  'minutes': 0,
                  'seconds': 0
              }],
              'syntax': 'DURATION',
              'minimum_time': self._min_time_value,
              'maximum_time': self._max_time_value
          }
docs: stub