def extent(self, **kwargs):
        convert_extent = None
        if SpatialBackend.postgis:
            def convert_extent(box, geo_field):
                # TODO: Parsing of BOX3D, Oracle support (patches welcome!)
                # Box text will be something like "BOX(-90.0 30.0, -85.0 40.0)"; 
                # parsing out and returning as a 4-tuple.
                ll, ur = box[4:-1].split(',')
                xmin, ymin = map(float, ll.split())
                xmax, ymax = map(float, ur.split())
                return (xmin, ymin, xmax, ymax)
        elif SpatialBackend.oracle:
            def convert_extent(wkt, geo_field):
                raise NotImplementedError
        return self._spatial_aggregate('extent', convert_func=convert_extent, **kwargs)
Returns True if this rrset matches the specified class, type,
dataset/ETHPy150Open dcramer/django-compositepks/django/contrib/gis/db/models/query.py/GeoQuerySet.extent--crossover with--dataset/ETHPy150Open golismero/golismero/thirdparty_libs/dns/rrset.py/RRset.match