| AgentInfo | Agency information. |
| ContactDetail | Information on the person who is the contact for the booking.Name of an individual and appropriate contact information. May be contact information for the customer or someone affiliated with the customer. |
| OwnInsuranceChoices | A collection of insurance policy details supplied by the customers. |
| PackageRequest | The codes identifying the package being bookedDefines a complete package holiday request. |
| PassengerListItems | Details of all passengers in a reservation or reservation segment. |
| PaymentDetails | A collection of chosen payment methods. |
| POS | Point of sale objectPoint of Sale (POS) identifies the party or connection channel making the request. |
| 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. |
| UniqueID | Booking or reservation reference - used when confirming a provisional reservation.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). |
 ActionType | Type of booking action required.To specify the type of action requested when more than one function could be handled by the message. |
| ExpectedGrossAmount | Used with an ActionType of 'Commit', this is used by the supplier to respond with a warning if the actual gross amount of the booking is different from this amount (optionally outside a mutually agreed tolerance value). |
| RequestedCurrency | The code specifying the currency in which the response should be sent. Use ISO 4217, three alpha code. |
| 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. |
| ReqRespVersion | Used to request the version of the payload message desired for the response. |