Status: IN
Visitor's stateful recursive computation (accumulating results across heterogeneous elements via the recursive triad's traversal flexibility) operates within a bidirectional OCP framework: Composite enables adding new element types without modifying operations, and Visitor enables adding new operations without modifying elements — together yielding recursive stateful computation that is extensible along both the type and operation axes.
Visitor's recursive computation + Composite-Visitor's bidirectional OCP = doubly-extensible recursive computation
Depends on (SL): visitor-recursive-stateful-operations, composite-visitor-dual-ocp-coverage