'See `graph_reference.get_valid_attributes`.'

def _get_valid_attributes(self):

    if (self._valid_attributes is None):
        parent_object_names = self._get_parent_object_names()
        valid_attributes = graph_reference.get_valid_attributes(self._name, parent_object_names)
        self.__dict__['_valid_attributes'] = valid_attributes
    return self._valid_attributes
