Operator  Design Pattern Facade
   Objective    Provide a unified interface to a set of
                interfaces in a subsystem
   Parameters   Objects: SubSys1, $dots$, SubSysN;
   Subtasks   
         1 - Create Object: -> FACADE
         2 - Compose Objects: SubSys1, $dots$, SubSys, FACADE -> FACADE
   Consequences   
         FACADE is a higher-level interface object shielding many other
         subsystem interfaces
   Product Text
         ADV/ADO FACADE
            Declarations
               ...
               Nested ADVs/ADOs
                  Compose SubSys1, $dots$, SubSysN;
            ...
         End FACADE
End Operator