public override object CreateProviderValue(DbGeographyWellKnownValue wellKnownValue)
 {
     wellKnownValue.CheckNull("wellKnownValue");
     return new ReadOnlySpatialValues(
         wellKnownValue.CoordinateSystemId, wellKnownValue.WellKnownText, wellKnownValue.WellKnownBinary, gmlValue: null);
 }