| HotelReservationIDs | Provides the ability to link a hotel search to a previsously booked hotel room.A Collection of HotelReservationID objects for a given reservation. The collection of all ReservationIDs can include Passenger Name Record (PNR), Guest Name Record (GNR) and Guest Folio numbers. Associated with each can be a Confirmation number which is usually given to the guest. |
| HotelSearchCriteria | Hotel search criteria.A collection of single search criterion items. |
 PromotionInfo | Promotion code pertaining to this portion of the search. |
| TPA_Extensions | A placeholder in the schema to allow for additional elements and attributes to be included per Trading Partner Agreement (TPA).Allows extensions to be added to the OpenTravel specification per trading partner agreement. |