All Schema files in the OTA specification are made available according to the terms defined by the OTA License Agreement at http://www.opentravel.org/ota_downloads_form.cfm PNR Update is an unsolicited message. There are times when a cruise line may change the data related to a booking, and the GDS or agency who holds the booking will be out of sync. This message from the cruise line provides all non-payment information about the booking back to the agency. such as, - Guest Personal information - Sailing information - Cabin and Category information - Additional package information - Mode of Transport information - Special service information - Insurance and Dining Information - Gift Information - Cruise profile codes - Method of payment options Point of sale object.