def _init_metadata(self):
        """stub"""
        self._shuffle_metadata = {
            'element_id': Id(self.my_osid_object_form._authority,
                             self.my_osid_object_form._namespace,
                             'shuffle'),
            'element_label': 'Shuffle',
            'instructions': 'Shuffle parameters',
            'required': True,
            'read_only': False,
            'linked': True,
            'array': False,
            'default_boolean_values': [True],
            'syntax': 'BOOLEAN',
        }