| BookingPayment | Specifies pricing and payment information about the booking.Contains pricing and payment information for the booking. |
 Errors | A collection of errors that occurred during the processing of a message.A collection of errors that occurred during the processing of a message. |
 PolicyInfo | May be used to provide policy information regarding the booking.An indication of a new paragraph for a sub-section of a formatted text message. |
| ReservationID | Specifies the reservation control information or the guest's booking ID in modification mode (e.g. PNR Record Locator and/or Vendor Confirmation Number). |
| SailingInfo | 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.Provides category information for the specified sailing. |
| Success | Standard way to indicate successful processing of an OpenTravel message. Returning an empty element of this type indicates success.Returning an empty element of this type indicates the successful processing of an OpenTravel message. This is used in conjunction with the Warning Type to report any warnings or business errors. |
| Warnings | Standard way to indicate successful processing of an OpenTravel message, but one in which warnings are generated.Collection of warnings. |
| 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. |