def filter_subject_descendants(self, parent=None, subject_type=None, predicate=None, max_depth=0):
        return self.op_expr(self.ASSOP_DESCEND_S, parent, subject_type, predicate, max_depth)
Filter to all descendant (child) resources in the association subject direction
dataset/ETHPy150Open ooici/pyon/pyon/ion/resregistry.py/ResourceQuery.filter_subject_descendants