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### I. Library-First Architecture
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This project develops **ONE** unified library for train positioning data post-processing with sensor fusion. The library MUST be:
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- Built on quality external dependencies rather than reinventing solutions (prefer established libraries for geospatial operations, data processing, numerical computation)
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- Independently testable without requiring application context
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- Documented with comprehensive API contracts and usage examples
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### II. CLI Interface Mandatory
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**ALL** library functionality MUST be exposed through a command-line interface. CLI implementations MUST:
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- Accept input via stdin, command-line arguments, or file paths
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- Emit results to stdout in machine-readable formats (JSON primary, human-readable optional)
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- Write errors and diagnostics exclusively to stderr
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### III. High Performance
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Performance MUST be a first-class design concern, not an afterthought. All implementations MUST:
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- Minimize memory allocations and copies
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- Use appropriate data structures for access patterns
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- Avoid unnecessary computational complexity
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**MANDATORY TDD workflow**: Tests written → User/stakeholder approval → Tests FAIL → Implementation → Tests PASS.
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**ALL** code MUST follow the Red-Green-Refactor cycle:
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1. **Red**: Write a failing test that defines desired behavior
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2. **Green**: Write minimal code to make the test pass
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3. **Refactor**: Improve code quality while keeping tests green
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**NO** implementation code may be written without a corresponding failing test first. Test-first is non-negotiable for:
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- New features (unit + integration tests)
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- Bug fixes (regression tests)
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- Refactoring (behavior preservation tests)
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### V. Full Test Coverage
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**100%** test coverage is the target. Every code path MUST be exercised by tests:
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- **Unit tests**: All functions, methods, branches, and edge cases
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- **Integration tests**: Component interactions and API contracts
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- **Contract tests**: Interface stability and backward compatibility
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- **Property-based tests**: Where applicable for complex logic
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- **Performance tests**: Benchmarks for critical operations
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Coverage reports MUST be generated and reviewed. Any uncovered code MUST be either:
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- Tested immediately, or
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- Justified in writing with explicit approval and tracked as technical debt
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### VI. Time with Timezone Awareness
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**ALL** temporal data MUST include timezone information. Implementations MUST:
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- Store times with explicit timezone (prefer UTC internally)
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- Parse input times with timezone validation
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- Convert between timezones accurately considering DST and historical changes
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### VII. Positions with Coordinate Reference System
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**ALL** spatial data MUST specify its Coordinate Reference System (CRS). Implementations MUST:
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- Store positions with explicit CRS identifier (e.g., EPSG codes)
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- Validate CRS compatibility before coordinate operations
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- Transform between CRS when required with documented accuracy
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### VIII. Thorough Error Handling
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**EVERY** failure mode MUST be anticipated and handled explicitly. Error handling MUST:
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- Use typed errors/exceptions with specific error codes
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- Provide actionable error messages with context
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- Distinguish between recoverable and non-recoverable errors
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### IX. Data Provenance and Audit Trail
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**ALL** data transformations and state changes MUST be traceable. Implementations MUST:
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- Record data source and lineage for all derived data
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- Log all modifications with timestamp, actor, and reason
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- Maintain immutable audit logs that cannot be altered retroactively
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### X. Integration Flexibility
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The library MUST support diverse integration patterns. Implementations MUST:
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- Provide library API as primary interface with clear entry points
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- Expose CLI for command-line automation and toolchain integration
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- Use standard data formats (JSON, CSV, binary formats) for interoperability
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**ALL** code, dependencies, and incorporated materials MUST be fully compatible with Apache License 2.0.
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**PROHIBITED** licenses and materials:
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- GPL, LGPL, AGPL (any version) - incompatible copyleft terms
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- Creative Commons Non-Commercial (CC BY-NC) - conflicts with commercial use
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- Any license restricting commercial use, modification, or distribution
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- Proprietary or closed-source components
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- Code without explicit license (legally ambiguous)
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**PERMITTED** licenses:
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- Apache 2.0, MIT, BSD (2-clause, 3-clause)
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- ISC, Unlicense, Public Domain (CC0)
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- LGPL ONLY via dynamic linking with clear separation
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**MANDATORY** compliance checks:
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- Every dependency MUST have documented license review
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- License scanning tools MUST run in CI/CD pipeline
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- New dependencies require explicit license approval
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### Code Quality Gates
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**ALL** contributions MUST pass:
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- Linter checks with zero errors (warnings documented and justified)
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- Type checking (where language supports static typing)
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- Test suite execution (all tests green)
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### Documentation Requirements
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**EVERY** public interface MUST include:
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- Purpose and usage examples
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- Parameter descriptions and types
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- Return value specifications
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### Review Process
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**ALL** changes MUST receive peer review verifying:
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- Constitution compliance (explicit confirmation)
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- Test coverage and TDD adherence
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- Error handling completeness
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### Amendment Process
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Constitution amendments require:
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1. Written proposal with rationale and impact analysis
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2. Review period (minimum 7 days for community feedback)
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3. Approval from project maintainers
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### Version Semantics
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Constitution versions follow MAJOR.MINOR.PATCH:
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- **MAJOR**: Breaking changes to core principles or removal of guarantees
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- **MINOR**: New principles, sections, or material expansions
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- **PATCH**: Clarifications, wording improvements, non-semantic fixes

LICENSE

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