@_parent.setter
    def _parent(self, value):
        self._parent_ref = None if value is None else weakref.ref(value)
Checks a function that returns an OGR Envelope by reference.
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/vartree.py/VariableTree._parent--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/contrib/gis/gdal/prototypes/errcheck.py/check_envelope