Status: OUT
The GoF catalog achieves complete design flexibility through two complementary coverage systems: the variation taxonomy with axis escape (23 patterns each encapsulating a variable aspect, Visitor handling the inverted extension axis) covers WHAT can vary in a design, while the four-dimensional behavioral modification space (wrapping depth, decoupling topology, state capture, state-strategy duality) covers HOW to modify behavior — both unified through the composition paradigm as the single organizing principle.
Variation taxonomy covers what-varies plus modification space covers how-to-modify, unified under composition
Depends on (SL): variation-comprehensive-with-axis-escape, behavioral-four-dimensional-modification-space