docs: def _init_metadata(self):
          """stub"""
          super(EulerRotationAnswerFormRecord, self)._init_metadata()
          self._euler_rotation_metadata = {
              'element_id': Id(self.my_osid_object_form._authority,
                               self.my_osid_object_form._namespace,
                               'angle_values'),
              'element_label': 'Euler Angle Values',
              'instructions': 'Provide X, Y, and Z euler angle rotation values',
              'required': True,
              'read_only': False,
              'linked': True,
              'array': False,
              'default_object_values': [{}],
              'syntax': 'OBJECT',
              'object_set': []
          }