Status: OUT
OCP's SOLID-grounded bidirectional extensibility serves as a central axis of systematic variation management: the composition direction (add new types) and the Visitor direction (add new operations) jointly cover the primary extension axes, with both anchored in the LSP-DIP-OCP dependency chain that grounds the variation paradigm — connecting OCP's theoretical foundation to the catalog's role as a variation taxonomy and composition guide.
Depth-6 — elevating OCP from "a grounded principle" (depth-5) within "design as variation management" (depth-5) to the central governing axis of the entire variation paradigm
Depends on (SL): ocp-bidirectional-grounded-in-solid, design-as-systematic-variation-management