{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.length","code":"thing-q36253","url":"https://ver.cy/models/thing/q36253/","name":"length","alternateNames":["calibre","medium calibre","ammunition calibre","high caliber","pupil diameter","eye axial length","inseam length","word length","scantling length","kinetic chain length","focal length","flange focal distance"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.QLT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The measurement of the extent of something along its greatest dimension, or of a line or path, measured in metres; also used for specific lengths such as calibre or eye axial length.","purpose":"Let an agent handle length with unit, method, uncertainty and what is measured, and separate it from distance between points.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Extent of an object or line","Base SI quantity","Distance is length between points","Specialised lengths have domain definitions"],"structure":{"bundles":[{"id":"definition","name":"Definition","description":"What length is meant.","layers":[{"id":"dimension","name":"Dimension","description":"Which extent.","findings":[{"id":"dimension-finding","name":"Dimension","description":"Which dimension.","questions":[{"text":"Which dimension of the object is measured?","kind":"definition"},{"text":"Between which reference points?","kind":"definition"}]}]},{"id":"domain","name":"Domain definition","description":"Calibre, axial length.","findings":[{"id":"domain-finding","name":"Domain","description":"Domain-specific definition.","questions":[{"text":"Does a domain define this length specially?","kind":"provenance"},{"text":"Which standard?","kind":"provenance"}]}]}]},{"id":"measurement","name":"Measurement","description":"How measured.","layers":[{"id":"instrument","name":"Instrument","description":"Tool.","findings":[{"id":"instrument-finding","name":"Instrument","description":"Instrument used.","questions":[{"text":"Which instrument measured it?","kind":"provenance"},{"text":"Is it calibrated?","kind":"provenance"}]}]},{"id":"uncertainty","name":"Uncertainty","description":"Error.","findings":[{"id":"uncertainty-finding","name":"Uncertainty","description":"Measurement uncertainty.","questions":[{"text":"What is the uncertainty?","kind":"measurement"},{"text":"At what temperature was it measured?","kind":"measurement"}]}]}]},{"id":"units","name":"Units","description":"Units and conversion.","layers":[{"id":"unit","name":"Unit","description":"Stated unit.","findings":[{"id":"unit-finding","name":"Unit","description":"Unit used.","questions":[{"text":"In which unit is it given?","kind":"definition"},{"text":"Could it be misread?","kind":"boundary"}]}]},{"id":"conversion","name":"Conversion","description":"Exact factors.","findings":[{"id":"conversion-finding","name":"Conversion","description":"Conversion factors.","questions":[{"text":"What is it in metres?","kind":"measurement"},{"text":"What rounding was used?","kind":"measurement"}]}]}]},{"id":"specification","name":"Specification","description":"Tolerances.","layers":[{"id":"tolerance","name":"Tolerance","description":"Allowed variation.","findings":[{"id":"tolerance-finding","name":"Tolerance","description":"Tolerance band.","questions":[{"text":"What tolerance applies?","kind":"measurement"},{"text":"Is the part within it?","kind":"boundary"}]}]},{"id":"fit","name":"Fit","description":"Matching parts.","findings":[{"id":"fit-finding","name":"Fit","description":"Fit between parts.","questions":[{"text":"Will the parts fit together?","kind":"boundary"},{"text":"Which fit class is specified?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Measure and report lengths with units and stated uncertainty.","Convert lengths between units correctly."],"mustNot":["Report a length without its unit.","Mix unit systems in calculations without converting.","Falsify measurements in trade, construction or medicine."],"requiresHuman":["Approving a part or structure based on measured lengths."]},"ethics":{"considerations":["Unit errors have destroyed spacecraft and injured patients.","Measurements in trade must be honest."],"affectedParties":["Users of measurements","Patients","Buyers"]},"owners":{"steward":"Nobody: a quantity; the international metrology bodies define the metre.","roles":[],"masterSystems":[]},"relations":[{"target":"Q123410660","type":"parent","note":"registry parent class"},{"target":"Q126017","type":"parent","note":"registry parent class"},{"target":"Q181175","type":"parent","note":"registry parent class"},{"target":"Q322481","type":"parent","note":"registry parent class"},{"target":"physical quantity","type":"related","note":"base quantity"},{"target":"distance","type":"related","note":"between points"},{"target":"metre","type":"related","note":"SI unit"},{"target":"curve","type":"related","note":"arc length"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.length","Wikidata: Q36253 (https://www.wikidata.org/wiki/Q36253)","SI unit symbol: m metre"]},"properties":{"applicability":"not-applicable","items":["SI unit: metre m - defined via the speed of light"]},"recognition":{"applicability":"optional","items":["Values in m, mm, in, ft","Dimension lines on drawings","Specialised lengths such as calibre","A number with a length unit on drawings, labels and instruments."]},"capabilities":{"applicability":"required","items":["measure it, with rulers, callipers, lasers","convert units","specify tolerances","compare sizes"]},"hazards":{"applicability":"required","items":["Unit confusion","Missing tolerances","Measurement at the wrong temperature for precision parts"]},"interfaces":{"applicability":"required","items":["SI Brochure","ISO 286 tolerances","Legal metrology rules for measuring instruments"]},"context":{"applicability":"required","items":["Describing size and fit, in engineering, trade, medicine and daily life.","object length","path length","diameters and calibres","anatomical lengths such as eye axial length"]}},"sources":[{"title":"Wikidata item Q36253: length","url":"https://www.wikidata.org/wiki/Q36253","note":"identity and sense of the item"},{"title":"Wikipedia: Length","url":"https://en.wikipedia.org/wiki/Length","note":"general description of the item"}],"openQuestions":["Should specialised lengths be separate entries?","How should tolerances be recorded?","The registry entry has merged aliases such as ammunition calibre; how should they be linked?"],"resources":{"spec":"/models/things/publications/thing-q36253/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q36253/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T05:35:33Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-06T19:51:59+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties."},"score":1.0}}