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`BandingScale` deliberately ships no canonical scale: which thresholds are correct for a metric is a policy question a library has no standing to settle, and baking one in would repeat the mistake the type was written to retire — `is_compliant`'s `pue < 1.5 && renewable_pct >= 50.0`, two magic floats with no provenance, no version, and no way to say which instrument they encoded. So the EU draft's PUE bands are published as **data**, in `jouleclaw/scales/v1/`, with their sources beside them. `BandingScale` already derives `Deserialize`, so a pack loads with `serde_json::from_str` and this adds no crate code at all — which is the point. Each pack is exactly a `BandingScale`, accompanied by a provenance file recording where the numbers came from, the status of that source, what the pack omits, and the reuse terms. A pack with no provenance file is not publishable here; a threshold whose origin is unstated is the thing the directory exists to replace. Three things the provenance says plainly: - **The instrument is a DRAFT** — registered 2026-03-26, revised 2026-07-02, not adopted and not in the Official Journal, with first labels expected 2027-08-15. A grade produced from it is not a regulatory determination. - **WUE is deliberately absent.** The instrument sets the grade from PUE *and* WUE, and only the PUE bands were read from it. Inventing WUE boundaries to complete the set would be exactly the failure this design prevents: a threshold with no provenance, presented as though it had one. A test asserts that a composite built from this pack reports `covers(&["pue","wue"]) == false`, so a half-graded facility cannot read as graded. - **The instrument permits calculation and estimates**, not only measurement, so a PUE fed to this scale may be self-declared. The scale bands whatever number it is given and says nothing about how that number was acquired. The scale id is a version and is never edited in place. Ratings cite their `scale_id` and `comparable_with` refuses to rank across scales, which only works if an id means one fixed set of boundaries forever — so a changed instrument is a new id, never an edit that would silently re-band grades already issued. The pack is tested, not merely committed: it is `include_str!`-ed, deserialized, validated and banded, and the test pins that its last boundary is **1900** — this file's own example fixture uses 2000, and only one of the two is sourced. Verified: 52 jouleclaw-compliance tests pass (2 new). Co-Authored-By: Claude Opus 5 <[email protected]>
18 lines
1.9 KiB
JSON
18 lines
1.9 KiB
JSON
{
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"scale_id": "eu.eed.dr2026.pue/1",
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"instrument": "Draft delegated regulation establishing an EU-wide scheme for rating the sustainability of data centres, with an electronic label",
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"instrument_status": "DRAFT — registered 2026-03-26, revised draft dated 2026-07-02. NOT adopted, NOT in the Official Journal.",
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"first_labels_expected": "2027-08-15",
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"graded_metrics_in_instrument": ["pue", "wue"],
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"metrics_in_this_pack": ["pue"],
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"omitted_deliberately": {
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"wue": "The instrument sets the A-G grade from PUE and WUE together, but this pack ships only the PUE bands, because only those were read from the instrument text. Inventing WUE boundaries to complete the set would be precisely the failure BandingScale exists to prevent: a threshold with no provenance, presented as if it had one. A composite grade built from this pack alone covers one axis, and CompositeRating::covers reports that it does."
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},
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"reuse": "Commission documents are reusable under Decision 2011/833/EU (CC BY 4.0). This pack restates threshold values only; it reproduces no instrument text.",
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"read_on": "2026-08-29",
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"caveats": [
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"A grade produced from this scale is NOT a regulatory determination. The instrument is a draft; its thresholds may change before adoption, and the scheme's own assurance requirements are not modelled here.",
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"The instrument permits measurement AND calculation methods, with an explicit fallback to well-founded assumptions and estimates. A PUE fed to this scale may therefore be self-declared. The scale bands whatever number it is given and says nothing about how that number was acquired — carry the acquisition class alongside it.",
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"This pack supersedes no earlier reading. If the adopted instrument differs, that is a NEW scale_id (eu.eed.dr2026.pue/2 or a successor), never an edit to this file: ratings cite the scale_id, so editing in place would silently re-band every grade already issued."
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]
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}
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