 Errors | Indicates that an error occurred in the processing of the incoming request message. An error is defined as a malformed XML message that could not be processed.A collection of errors that occurred during the processing of a message. |
| ProcessingInformation | Information that may have impacted how the receiving system processed the request message. |
| Success | An element that is not intended to contain any data. The mere presence of a success element within the response message indicates that the incoming request message was processed successfully.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. |
 TourActivityInfo | Available tours/ activities that meet the specified availability request criteria with an indicator is this is an alternate tour/ activity, e.g. it does not meet the exact availability criteria specified. |
| 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. |
| Warnings | The presence of this element indicates that, while the preceding request message has been successfully processed, the request may not have been fully satisfied.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. |