This array will contain the CAF ID of the previous version of the address and any candidates which are superceded by this update. The client system should look in its own database for any instance of these CAF IDs and take appropriate action to incorporate the changes in the Address field, if any, into its own database.

In order that this can work, CAF checks to see if any of these predecessor CAF IDs are greater than the fromCAFID parameter specified by the client system in the GetUpdates call. If so, it will recursively include the CAF IDs of their predecessors, finishing with a CAF ID which is less than or equal to fromCAFID and is therefore known to the client system.