{"id":"builder-visitor-duality-validates-category-permeability-with-ocp-scope","text":"Builder-Visitor's bidirectional functional duality (Builder analyzing without creating, Visitor creating during traversal) and Composite-Visitor's bidirectional OCP coverage (new types via Composite, new operations via Visitor) together establish that the boundary between Creational and Behavioral categories is permeable in both function and extensibility: operations can migrate from construction to analysis and back, and extensibility axes span both structural and behavioral domains.","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["builder-visitor-bidirectional-functional-duality","composite-visitor-dual-ocp-coverage"],"outlist":[],"label":"Builder-Visitor functional permeability and Composite-Visitor OCP permeability independently validate category boundaries as permeable"}],"dependents":[],"metadata":{"source_type":"derived","review_result":"pass"},"created_at":"2026-06-18T04:21:37+00:00","updated_at":"2026-06-18T06:15:08+00:00","reviewed_at":"2026-06-18T06:15:08+00:00","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"builder-visitor-duality-validates-category-permeability-with-ocp-scope","truth_value":"IN","reason":"SL justification valid","antecedents":["builder-visitor-bidirectional-functional-duality","composite-visitor-dual-ocp-coverage"],"label":"Builder-Visitor functional permeability and Composite-Visitor OCP permeability independently validate category boundaries as permeable"},{"node":"builder-visitor-bidirectional-functional-duality","truth_value":"IN","reason":"SL justification valid","antecedents":["builder-visitor-dual-structure-traversal-patterns","discretionary-glyphs-validate-visitor-as-construction-mechanism"],"label":"Builder's analysis capability and Visitor's construction capability complete the structural duality into a functional one"},{"node":"builder-visitor-dual-structure-traversal-patterns","truth_value":"IN","reason":"SL justification valid","antecedents":["builder-maximally-decoupled-from-product","visitor-accumulates-across-structures"],"label":"Builder (construct-time traversal) and Visitor (use-time traversal) are structural duals sharing accumulation, protocol decoupling, and parent-independence"},{"node":"builder-maximally-decoupled-from-product","truth_value":"IN","reason":"SL justification valid","antecedents":["builder-products-no-common-parent","builder-can-analyze-without-creating","builder-methods-empty-by-default"],"label":"Three properties uniquely distinguish Builder's decoupling from other creational patterns"},{"node":"builder-products-no-common-parent","truth_value":"IN","reason":"premise"},{"node":"builder-can-analyze-without-creating","truth_value":"IN","reason":"premise"},{"node":"builder-methods-empty-by-default","truth_value":"IN","reason":"premise"},{"node":"visitor-accumulates-across-structures","truth_value":"IN","reason":"SL justification valid","antecedents":["visitor-structure-independent-operations","gof-visitor-accumulates-state"],"label":"Structure independence plus state accumulation enables cross-element analysis over heterogeneous collections"},{"node":"visitor-structure-independent-operations","truth_value":"IN","reason":"SL justification valid","antecedents":["visitor-traverses-any-object-structure","gof-visitor-no-common-parent-required"],"label":"Two independently stated Visitor generality properties (any structure, no common parent) establish Visitor as universally applicable for operations"},{"node":"visitor-traverses-any-object-structure","truth_value":"IN","reason":"premise"},{"node":"gof-visitor-no-common-parent-required","truth_value":"IN","reason":"premise"},{"node":"gof-visitor-accumulates-state","truth_value":"IN","reason":"premise"},{"node":"discretionary-glyphs-validate-visitor-as-construction-mechanism","truth_value":"IN","reason":"SL justification valid","antecedents":["discretionary-glyphs-visitor-created","builder-can-analyze-without-creating"],"label":"Visitor creating discretionary glyphs and Builder analyzing without creating are symmetric demonstrations that traversal patterns transcend the analysis/construction boundary"},{"node":"discretionary-glyphs-visitor-created","truth_value":"IN","reason":"premise"},{"node":"composite-visitor-dual-ocp-coverage","truth_value":"IN","reason":"SL justification valid","antecedents":["composite-as-universal-recursive-structure","visitor-inverts-ocp-axis"],"label":"Composite covers standard OCP axis (new types) while Visitor covers inverted axis (new operations) for the same structures"},{"node":"composite-as-universal-recursive-structure","truth_value":"IN","reason":"SL justification valid","antecedents":["composite-uniform-leaf-composite-treatment","interpreter-abstract-syntax-tree-is-composite","macrocommand-is-composite-of-commands"],"label":"Three distinct patterns reuse Composite's recursive composition structure"},{"node":"composite-uniform-leaf-composite-treatment","truth_value":"IN","reason":"premise"},{"node":"interpreter-abstract-syntax-tree-is-composite","truth_value":"IN","reason":"premise"},{"node":"macrocommand-is-composite-of-commands","truth_value":"IN","reason":"premise"},{"node":"visitor-inverts-ocp-axis","truth_value":"IN","reason":"SL justification valid","antecedents":["visitor-enables-open-ended-operations","visitor-tradeoff-stable-structure-required","ocp-open-for-extension-closed-for-modification"],"label":"Visitor's open-ops/closed-structure stance is the precise mirror of OCP's open-structure/closed-ops stance"},{"node":"visitor-enables-open-ended-operations","truth_value":"IN","reason":"premise"},{"node":"visitor-tradeoff-stable-structure-required","truth_value":"IN","reason":"premise"},{"node":"ocp-open-for-extension-closed-for-modification","truth_value":"IN","reason":"premise"}]}}