| RequestorType | Identifies the type of requestor so the response can be filtered appropriately. |
| SecondaryRoutingIndicator | When true, indicates that this party is someone other than the requestor and should also receive the post event report (i.e., a HotelPostEventNotifRQ should be sent to this party). |
 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. |