====== 14.4 IDL Directory Model ====== [[fxdemo:04-part:14-phase-0-repository-and-build-artifact-model:start | Go To Phase 0 Repository and Build Artifact Model ]] The IDL directory contains governed IDL definitions used to generate Phase 0 implementation data artifacts. IDL artifacts realize selected FX logical information structures. Each IDL file must preserve [[dido:99_annexes:annex-b-terms-and-definitions:t:traceability|Traceability]] to the FX logical information structures it represents. IDL comments or associated metadata should identify the source logical information structure, related [[dido:99_annexes:annex-b-terms-and-definitions:d:dds|DDS]] Topic, [[dido:99_annexes:annex-b-terms-and-definitions:r:runtime_plane|Runtime Plane]], version context, and generation rule. The IDL directory is a governed source location. Changes to IDL definitions can affect generated types, DDS Topic compatibility, implementation modules, tests, scripts, traceability tables, and later deployment and [[dido:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]] planning. IDL changes therefore require review under the Phase 0 implementation governance model. ---- © 2026 Dido Solutions, Inc. and Jackrabbit Consulting, Inc.