code: def _init_metadata(self):
          
          self._start_timestamp_metadata = {
              'element_id': Id(self.my_osid_object_form._authority,
                               self.my_osid_object_form._namespace,
                               'start_timestamp'),
              'element_label': 'start timestamp',
              'instructions': 'enter an integer number of seconds for the start time',
              'required': False,
              'read_only': False,
              'linked': False,
              'array': False,
              'syntax': 'INTEGER',
              'minimum_integer': 0,
              'maximum_integer': None,
              'integer_set': [],
              'default_integer_values': [0]
          }
          self._end_timestamp_metadata = {
              'element_id': Id(self.my_osid_object_form._authority,
                               self.my_osid_object_form._namespace,
                               'end_timestamp'),
              'element_label': 'end timestamp',
              'instructions': 'enter an integer number of seconds for the end time',
              'required': False,
              'read_only': False,
              'linked': False,
              'array': False,
              'syntax': 'INTEGER',
              'minimum_integer': 0,
              'maximum_integer': None,
              'integer_set': [],
              'default_integer_values': [0]
          }
docs: stub