def exists(self, index):
        return self._node.attributes.has_private_attribute(index)
Returns true if the elements in the DE-9IM intersection matrix for the
dataset/ETHPy150Open EricssonResearch/calvin-base/calvin/calvinsys/attribute/private.py/PrivateAttribute.exists--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/contrib/gis/geos/geometry.py/GEOSGeometry.relate_pattern