docs: public static Geometry difference(Geometry geometry1, Geometry substractor,
  			SpatialReference spatialReference) {
  		OperatorDifference op = (OperatorDifference) factory
  				.getOperator(Operator.Type.Difference);
  		Geometry result = op.execute(geometry1, substractor, spatialReference,
  				null);
  		return result;
  	}