| SyncDateTime | Specifies the Syncronization date of the record between GDS and CruiseLine. |
 ID | 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. |
| ID_Context | Used to identify the source of the identifier (e.g., IATA, ABTA). |
| Instance | 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. |
| Type | A reference to the type of object defined by the UniqueID element. Refer to OpenTravel Code List Unique ID Type (UIT). |
| URL | URL that identifies the location associated with the record identified by the UniqueID. |