def _registerNamedSingleton(self, objectId, singletonName):
        self._objectRegistry.defineNamedSingleton(objectId, singletonName)
for a src node, will return the equivalent bld node (or self if not possible)
dataset/ETHPy150Open ufora/ufora/packages/python/pyfora/PyObjectWalker.py/PyObjectWalker._registerNamedSingleton--crossover with--dataset/ETHPy150Open cournape/Bento/bento/core/node.py/NodeWithBuild.get_bld