def xpath_empty_pseudo(self, xpath):
        xpath.add_condition("not(node())")
        return xpath
.. todo::
dataset/ETHPy150Open gawel/pyquery/pyquery/cssselectpatch.py/JQueryTranslator.xpath_empty_pseudo--crossover with--dataset/ETHPy150Open lisa-lab/pylearn2/pylearn2/models/dbm/ising.py/IsingHidden.mf_update