| # Source provenance and lineage |
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| Provenance is the evidence chain that explains what material was considered, where it came from, |
| which exact version was reviewed, what permission applies, how it was transformed, and why the |
| result is suitable for a stated research purpose. |
|
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| ## Minimum source record |
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| Every source must identify: |
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| - a stable `source_id` and human-readable title; |
| - canonical publisher and HTTPS location; |
| - version, snapshot date, or immutable revision; |
| - retrieval time and SHA-256 digest of the reviewed local artifact; |
| - licence identifier, licence URL, and redistribution decision; |
| - privacy and sensitive-data review state; |
| - consent, contract, public-interest, or other applicable lawful basis; |
| - allowed purpose, restrictions, attribution, and retention requirements; |
| - reviewer identity, decision time, and review notes. |
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| `unknown` and `pending` are valid research states. They are not approval states. |
|
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| ## Lineage record |
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| Each preprocessing run should bind: |
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| 1. source-manifest digest; |
| 2. code repository revision; |
| 3. executable command and configuration; |
| 4. runtime and dependency versions; |
| 5. input and output digests; |
| 6. accepted, rejected, duplicate, and error counts; |
| 7. split assignment method and seed, if any; |
| 8. every filter with its version and decision rule; |
| 9. a sample-based manual review record; |
| 10. known limitations and unresolved risks. |
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| ## Versioning rules |
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| - Never overwrite a released manifest or processed artifact in place. |
| - Treat source changes, licence changes, filter changes, and split changes as new versions. |
| - Prefer immutable revisions and content digests over mutable `latest` URLs. |
| - Preserve withdrawal and correction records instead of erasing history. |
| - Record whether downstream deletion is possible when a source is withdrawn. |
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| ## Evidence language |
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| - **Verified** — directly observed and bound to evidence in the current review. |
| - **Proposed** — designed or nominated but not approved or executed. |
| - **Unknown** — required evidence is missing or cannot currently be established. |
| - **Rejected** — reviewed and not authorised for the stated purpose. |
| - **Withdrawn** — previously considered or approved, then removed from future use. |
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