Identifes the primary language preference for the message. The human language is identified by ISO 639 codes.

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).

When true, indicates the message is being re-sent after a failure. It is recommended that this attribute is used (i.e., set to TRUE) only when a message is retransmitted.

A 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).

Used to identify the sequence number of the transaction as assigned by the sending system; allows for an application to process messages in a certain order or to request a resynchronization of messages in the event that a system has been off-line and needs to retrieve messages that were missed.

The division name or ID with which the contact is associated.

A reference for additional message identification, assigned by the requesting host system. When a request message includes an echo token the corresponding response message MUST include an echo token with an identical value.

Used to provide the company common name.

Identifies the context of the identifying code, such as DUNS, IATA or internal code, etc.

This indicates where this message falls within a sequence of messages.

Identifies the company that is associated with the UniqueID.

Indicates the creation date and time of the message in UTC using the following format specified by ISO 8601; YYYY-MM-DDThh:mm:ssZ with time values using the 24 hour clock (e.g. 20 November 2003, 1:59:38 pm UTC becomes 2003-11-20T13:59:38Z).

A reference to the type of object defined by the UniqueID element. Refer to OTA Code List Unique ID Type (UIT).

Used to indicate whether the request is for the Test or Production system.

For all OTA versioned messages, the version of the message is indicated by a decimal value.

A unique identifying value assigned by the creating system. The ID attribute may be used to reference a primary-key value within a database or in a particular implementation.

The identification of a record as it exists at a point in time. An instance is used in update messages where the sender must assure the server that the update sent refers to the most recent modification level of the object being updated.

Refer to OTA Code List Travel Sector (TVS).

URL that identifies the location associated with the record identified by the UniqueID.

Sends a request to another system to permit a system that normally receives notifications to ask for a re-transmission of a message. The business model assumes that the requesting system either receives messages that are numbered sequentially, and may ask for a message to be re-sent. In the event that the receiving system receives a message that is not in contiguous numerical sequence, this message set can be used to retrieve missing messages, or to ask for a retransmission of data that for some reason was not cleanly received.

Identifies a company by the company code.

Used to identify the source of the identifier (e.g., IATA, ABTA).

The department name or ID with which the contact is associated.

Identifies the alternate language for a customer or message. The human language is identified by ISO 639 codes.