Status: IN
The aggregation-acquaintance distinction (ownership with coincident lifetimes versus dynamic association, indistinguishable in code) explains why the recursive subsystem exhibits such compositional diversity: Composite uses aggregation (whole-part ownership), while Iterator and Chain of Responsibility use acquaintance (traversal and routing relationships) — the same recursive tree structure supports fundamentally different design relationships at the semantic level, grounded by the general principle that composition's flexibility is semantic rather than implementational.
Aggregation/acquaintance semantic distinction explains how a single recursive structure supports diverse behavioral relationships
Depends on (SL): aggregation-acquaintance-grounds-composition-semantics, recursive-subsystem-bidirectionally-engineered