====== 20.1 Overview ====== [[fxdemo:04-part:start | Go To Top ]] [[fxdemo:04-part:20-phase-0-implementation-rules-and-constraints:start | Return to Phase 0 Implementation Rules and Constraints ]] The Phase 0 Implementation Rules and Constraints define the boundaries that preserve the relationship between the FX Demo Logical Profile and the Phase 0 Implementation Profile / PSM. These rules prevent implementation artefacts, technologies, generated artefacts, [[dido:99_annexes:annex-b-terms-and-definitions:r:repository|Repository]] structures, scripts, Developer Handbook rules, [[dido:99_annexes:annex-b-terms-and-definitions:d:deployment|Deployment]] concerns, or [[dido:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]] concerns from redefining the conceptual, logical, or FX logical profile layers. Section 21 expresses the formal Phase 0 implementation [[dido:99_annexes:annex-b-terms-and-definitions:r:requirement|Requirements]]. This section explains the implementation rules and constraints that motivate those Requirements. © 2026 Dido Solutions, Inc. and Jackrabbit Consulting, Inc.