Status: IN
Structural patterns organize into two orthogonal spectra: boundary patterns (Adapter/Facade) translate between incompatible interfaces at system edges with different granularities, while wrapping patterns (Proxy/Decorator) augment behavior within a single compatible interface hierarchy with different intents.
Two orthogonal structural axes — translation across interfaces vs augmentation within a single interface
Depends on (SL): adapter-facade-interface-boundary-pair, proxy-decorator-wrapping-spectrum