Status: OUT
The GoF catalog achieves comprehensive variation coverage precisely because it combines the standard composition-centric approach (each pattern encapsulates a variation point, extended via new implementations) with Visitor's principled escape hatch for the inverted axis (new operations without modifying element classes) — ensuring that neither the type-extension nor the operation-extension dimension is left uncovered.
Standard OCP covers type variation; Visitor inverts the axis to cover operation variation; together they span both extension dimensions of the catalog
Depends on (SL): variation-and-composition-unified-catalog, ocp-composition-with-principled-escape