@property
    def srid(self):
        "Returns the SRID of top-level authority, or None if undefined."
        try:
            return int(self.attr_value('AUTHORITY', 1))
        except (__HOLE__, ValueError):
            return None

    #### Unit Properties ####
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/contrib/gis/gdal/srs.py/SpatialReference.srid