Companion Annex S

Reference Implementations

This annex outlines reference implementation approaches for Constitutional Execution Infrastructure (CEI). The goal is to demonstrate how the architectural concepts described throughout the specification can be realized using common software platforms while preserving interoperability.

1. Supported Reference Platforms

Platform	Typical Use	Strengths
Python	Governance engines, orchestration, research prototypes.	Rapid development, rich ecosystem.
TypeScript / Node.js	APIs, web applications, cloud-native services.	Shared frontend/backend language.
Go	High-performance infrastructure services.	Concurrency and operational simplicity.

2. Suggested Repository Layout

cei-runtime/
 ├── api/
 ├── governance/
 ├── ledger/
 ├── replay/
 ├── projections/
 ├── policies/
 ├── sdk/
 ├── tests/
 └── docs/

3. Core Components

Component	Responsibility
API Layer	Expose governance services.
Decision Engine	Evaluate authority, policy, evidence and admissibility.
Ledger	Persist immutable execution history.
Replay Engine	Reconstruct historical execution.
Projection Engine	Generate operational read models.
SDK	Provide client abstractions.

4. Reference Pipeline

Developer Commit
        ↓
Static Analysis
        ↓
Unit Tests
        ↓
Integration Tests
        ↓
Conformance Tests
        ↓
Container Build
        ↓
Deployment

5. Implementation Principles

Separate governance from business logic.
Version policies independently of application code.
Persist immutable execution events.
Support deterministic replay.
Document public APIs and schemas.

Conclusion

Reference implementations provide practical examples while remaining consistent with the architectural and specification guidance established throughout the CEI publications.

Next: Companion Annex T — Formal Glossary & Ontology.

Engineering Evidence

Evidence and verification layer

This document forms part of the CEI publication record. Supporting evidence is organized through the engineering-evidence archive, specifications, architecture documentation and replay verification materials.

Evidence methodology Repository landscape CEI specification Replay verification Architecture map

Document: CEI_Companion_Annex_S_Reference_Implementations.html
Edition: First Public Edition
Version: 1.1