ACTIVITY METHOD REPRESENTATIVE 
FUNCTIONS 
CONSTRUCTOR Issue unique obj-id 
Create new object 
VALIDATE Correctness of attributes 
topology 
PRE-MODIFY Authority check 
Modify existing objects 
POST-MODIFY Internal checks 
VALIDATE Checks in relation to other 
objects (geometry, topology) 
Management Log 
History Object? 
DESTRUCTOR Authority check 
Destroy object(s) 
VALIDATE Resolve trailing references 
History object? 
Merge child version into VALIDATE Checks with respect to whole 
parent dataset 
MERGE Management Log and 
generation of update notices 
and guidance files (digital 
updates) 
COMMIT 
[ROLL BACK] Update metadata 
  
961 
Figure 3: Object Life Cycle 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996