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 book request message requests booking creation on the cruise line system for a given sailing with a specific mode of transportation/ gateway city pair and currency and for a selected fare/category pair and a cabin number. It also integrates this booking into a GDS's PNR based on the cruise line reply. Optional request information can include: - Guest city - Inclusive package Point of sale object. Specifies the information of the an agent who is creating or modifying the booking Provides either the agent or agency's name that created the booking. Agent or agency's identifier (e.g., an employee reward number). Specifies the information of the deleted guest from the current booking. Normally used in Modification mode. The guest's reference number in the booking being modified. Specifies the selected category to book.Contains information related to the selected sailing. Typically the selected sailing is one of the sailings returned in the previous sailing availability response. Specifies information about the booking.