| AccommodationChoices | A collection of available properties. Used by some operators when the requested accommodation item for the package is not available. |
 Errors | The presence of this element indicates that the receiving system has been unable to process preceding request message.A collection of errors that occurred during the processing of a message. |
| Package | Details of the requested package. |
| Success | The presence of this element indicates that the receiving system has successfully processed the preceding request message.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. |
| 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. |
| TravelChoices | A collection of TravelItem elements. Used by some operators when the requested travel item for the package is not available. |
| Warnings | The presence of this element indicates that, while the preceding request message has been successfully processed, the requeat may not have been fully satisfied.Collection of warnings. |
| Code | Identifies a company by the company code. |
| CodeContext | Identifies the context of the identifying code, such as DUNS, IATA or internal code, etc. |
| CompanyShortName | Used to provide the company common name. |
| CountryCode | The country location of the company headquarters. |
| TravelSector | The travel sector the company is associated with, such as air, car and hotel. Refer to OpenTravel Code List Travel Sector (TVS). |
| CurrencyCode | An ISO 4217 (3) alpha character code that specifies a monetary unit. |
| DecimalPlaces | The ISO 4217 standard "minor unit" for the number of decimal places for a particular currency. |
| 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. |