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 The itinerary description request message is used to request the itinerary description on a specific cruise booking. Point of sale object. Contains the reservation ID of a booking. Contains information related to the selected sailing. Allows to query for package options that the cruise might offer with the sailing. The standard attributes that appear on the root element for all OTA payloads.