@cached_property
    def cache_key(self):
        return self._key
Internal method for splitting a prefixed Element name into its
dataset/ETHPy150Open OP2/PyOP2/pyop2/caching.py/Cached.cache_key--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/words/xish/domish.py/_splitPrefix