| DonationInformation | Information about an independent charitable donation made with the hotel booking.Provides information about donations made during a booking. |
| HotelReservations | A collection of hotel reservations.A collection of hotel reservations. |
| POS | The point-of-sale data, contained in the POS element, communicates the information that allows the receiving system to identify the trading partner that is sending the request or the response message.Point of Sale (POS) identifies the party or connection channel making the request. |
| RebatePrograms | Collection of rebate programs the hotel participates in. |
 UniqueID | An identifier used to uniquely reference an object in a system (e.g. an airline reservation reference, customer profile reference, booking confirmation number, or a reference to a previous availability quote).An identifier used to uniquely reference an object in a system (e.g. an airline reservation reference, customer profile reference, booking confirmation number, or a reference to a previous availability quote). |
| HoldDuration | The period from the date and time the reservation was booked until the hold on the inventory is released. |
| ResStatus | Indicates the status of the reservation represented by the message.To specify the type of action requested when more than one function could be handled by the message. |
| AltLangID | The alternate language for a customer or message encoded as ISO 639-3. |
| CorrelationID | Allows end-to-end correlation of log messages with the corresponding Web service message throughout the processing of the Web service message. |
| EchoToken | A reference for additional message identification, assigned by the requesting host system. |
| PrimaryLangID | The primary language preference for the message encoded as ISO 639-3. |
| RetransmissionIndicator | When true, indicates the message is being re-sent after a failure. |
| SequenceNmbr | The sequence number of the transaction assigned by the sending system for ordered message processing or message resynchronization. |
| Target | Test or Production target system indicator. |
| TargetName | The name of the Test or Production system. |
| TimeStamp | ISO 8601 encoded timestamp indicating the creation date and time of the message. |
| TransactionIdentifier | Unique identifier to relate all messages within a transaction (e.g. this would be sent in all request and response messages that are part of an on-going transaction). |
| TransactionStatusCode | This indicates where this message falls within a sequence of messages. |
 Version | The OpenTravel message version indicated by a decimal value. |