def _registerNamedSingleton(self, objectId, singletonName):
        self._objectRegistry.defineNamedSingleton(objectId, singletonName)
`_registerNamedSingleton`: register a `NamedSingleton`
dataset/ETHPy150Open ufora/ufora/packages/python/pyfora/PyObjectWalker.py/PyObjectWalker._registerNamedSingleton