private void createPlanForVehicleType(ITitleLinkPair vehicleType)
        {
            // web request - producers
            VehicleTypeDocumentRequestor dr     = new VehicleTypeDocumentRequestor(new WebRequestor(), vehicleType.Link);
            VehicleTypeParser            parser = new VehicleTypeParser(dr);

            ITitleLinkPair[] producers = parser.Parse();
            vehicleTypeProducers.Add(vehicleType.Title, producers);
        }