{ "model": { "rank": 1664, "code": "thing-q36253", "model_id": "vr.tr.length", "name": "length", "purpose": "Let an agent handle length with unit, method, uncertainty and what is measured, and separate it from distance between points.", "family": "Thing Registry", "category": "Cross-cutting context", "status": "research-draft", "kind": "thing", "plane": "XCT", "domain": "XCT.QLT", "industry": "", "version": "", "url": "/models/thing/q36253/", "tier": 2, "score": 133, "payload": { "layer": "wikidata", "aliases": [ "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", "London penetration depth", "diameter", "arc length", "path length", "Cartesian coordinate", "bond length", "great-circle distance", "slowing-down length", "diffusion length", "migration length", "parallel displacement", "35 mm equivalent focal length", "characteristic thickness", "characteristic diameter", "tip diameter", "pipe diameter", "particle diameter", "diameter of bubbles", "pipe size", "root diameter", "observable diameter", "hydraulic diameter", "activity median aerodynamic diameter", "Sauter mean diameter", "equivalent spherical diameter", "pupil size", "shaft diameter", "critical diameter" ], "aliasCount": 125, "merged": 126, "knownIn": 133, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": "vr.tr.length-attribute", "source": { "dataset": "wikidata", "item": "Q36253", "url": "https://www.wikidata.org/wiki/Q36253", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-11T05:35:33Z", "providers": [ "Claude" ], "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify", "pass": 2, "wave": 1, "engine": "claude" }, "metaModel": { "id": "THING-Q36253", "registryId": "vr.tr.length", "name": "length", "version": "0.2.0-wave.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "XCT.QLT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q36253/", "model": { "registry_id": "vr.tr.length", "name": "length", "purpose": "Let an agent handle length with unit, method, uncertainty and what is measured, and separate it from distance between points.", "definition": "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.", "what_it_is_for": "Describing size and fit, in engineering, trade, medicine and daily life.", "affordances": [ "measure it, with rulers, callipers, lasers", "convert units", "specify tolerances", "compare sizes" ], "distinguishing_features": [ "Extent of an object or line", "Base SI quantity", "Distance is length between points", "Specialised lengths have domain definitions" ], "appearance": "A number with a length unit on drawings, labels and instruments.", "visual_identification": [ "Values in m, mm, in, ft", "Dimension lines on drawings", "Specialised lengths such as calibre" ], "physical_properties": [ { "quantity": "SI unit", "typical_range": "metre", "unit": "m", "note": "defined via the speed of light" } ], "families_and_kinds": [ "object length", "path length", "diameters and calibres", "anatomical lengths such as eye axial length" ], "related_models": [ { "relation": "is a kind of", "target": "physical quantity", "why": "base quantity" }, { "relation": "has kind", "target": "distance", "why": "between points" }, { "relation": "is measured in", "target": "metre", "why": "SI unit" }, { "relation": "relates to", "target": "curve", "why": "arc length" } ], "identifiers": [ { "scheme": "SI unit symbol", "value_or_pattern": "m", "note": "metre" } ], "standards_and_regulation": [ "SI Brochure", "ISO 286 tolerances", "Legal metrology rules for measuring instruments" ], "failure_modes_and_hazards": [ "Unit confusion", "Missing tolerances", "Measurement at the wrong temperature for precision parts" ], "in_scope": [], "out_of_scope": [], "characteristics": [] }, "sources": [], "structure": { "bundles": [ { "id": "definition", "name": "Definition", "description": "What length is meant.", "rationale": "Which dimension is measured must be clear.", "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.", "rationale": "Method sets accuracy.", "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.", "rationale": "Unit errors cause failures.", "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.", "rationale": "Specifications need 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" } ] } ] } ] } ] }, "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?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "abstract concept", "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.", "facetsInferred": true, "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.", "purpose": "Give an agent a durable, checkable way to recognise a length, record what state it is in, and decide what may be done with it.", "whatItIs": "Let an agent handle length with unit, method, uncertainty and what is measured, and separate it from distance between points.", "characteristics": { "substance": "abstract", "origin": "conceptual", "agency": "inert" }, "whatYouCanDoWithIt": [ "observed and measured" ], "distinguishingFeatures": [ "Names folded into this entry, which a task may need to split apart again: 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.", "126 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 133 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is." ], "openQuestionsForResearch": [ "Which of the bundles below does a real task actually need, and which are ceremony?", "What does this thing have that the facets do not capture at all?", "Which neighbouring kind is most often confused with a length, and on what evidence are they told apart?" ], "whatItIsMadeOf": "an abstraction with no physical instance", "physicalCharacter": [ "Does nothing on its own; everything it does, something else did to it.", "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing." ], "whatCanBeDoneWithIt": [ "observe it, measure it, record its state" ], "howItIsRecognised": [ "Nothing to see. What is recognised is an instance of it, and which instances count is exactly what is argued about." ], "relatedModels": [ { "relation": "covers", "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.", "targets": [ "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" ] } ], "standing": "Described in 133 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 126 finer distinctions are held inside this entry as names rather than as separate models.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one length from another, and a length from things that resemble it.", "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.", "layers": [ { "id": "naming-and-identifiers", "name": "Names and identifiers", "description": "The names this thing goes by and the identifiers that survive translation and time.", "findings": [ { "id": "preferred-name-and-aliases", "name": "Preferred name, aliases and local names", "description": "Which name to use, which names mean the same thing, and which merely sound similar.", "questions": [ { "id": "preferred-name-and-aliases-q01", "text": "What identifies and describes the name of a length, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "preferred-name-and-aliases-q02", "text": "Who or what asserted this about the name of a length, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "preferred-name-and-aliases-q03", "text": "What may an agent decide or do once the name of a length is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "stable-identifiers", "name": "Stable identifiers and external keys", "description": "Identifiers that keep pointing at this kind of thing across systems and languages.", "questions": [ { "id": "stable-identifiers-q01", "text": "What identifies and describes an identifier for a length, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stable-identifiers-q02", "text": "Who or what asserted this about an identifier for a length, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stable-identifiers-q03", "text": "What may an agent decide or do once an identifier for a length is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "classification-and-granularity", "name": "Classification and granularity", "description": "Where a length sits among kinds, and how finely a task needs to cut it.", "findings": [ { "id": "kind-and-parents", "name": "Kind, parents and neighbouring kinds", "description": "The classes this thing belongs to and the ones it is next to.", "questions": [ { "id": "kind-and-parents-q01", "text": "What identifies and describes the kind of a length, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "kind-and-parents-q02", "text": "Who or what asserted this about the kind of a length, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "kind-and-parents-q03", "text": "What may an agent decide or do once the kind of a length is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "distinguishing-features", "name": "Distinguishing features", "description": "What separates a length from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a length, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "distinguishing-features-q02", "text": "Who or what asserted this about what distinguishes a length, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "distinguishing-features-q03", "text": "What may an agent decide or do once what distinguishes a length is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "state-and-lifecycle", "name": "State and lifecycle", "description": "The states a length passes through and the events that move it between them.", "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.", "layers": [ { "id": "lifecycle-stages", "name": "Lifecycle stages", "description": "From coming into existence to ceasing to be one of these.", "findings": [ { "id": "stages-and-transitions", "name": "Stages and transitions", "description": "The stages worth naming and what moves a length between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a length, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stages-and-transitions-q02", "text": "Who or what asserted this about the lifecycle of a length, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stages-and-transitions-q03", "text": "What may an agent decide or do once the lifecycle of a length is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "observations-and-status", "name": "Observations and current status", "description": "What is observed about a length, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a length is recorded so that it can be superseded rather than overwritten.", "questions": [ { "id": "observation-record-q01", "text": "What identifies and describes an observation of a length, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "observation-record-q02", "text": "Who or what asserted this about an observation of a length, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "observation-record-q03", "text": "What may an agent decide or do once an observation of a length is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "definitions-in-contest", "name": "Definitions and who holds them", "description": "What length is taken to mean, and by whom.", "rationale": "When a field disagrees about a concept, the disagreement is the content. A model that picks one definition silently destroys the information.", "layers": [ { "id": "competing-definitions", "name": "Competing definitions", "description": "The main readings and the traditions behind them.", "findings": [ { "id": "definition-map", "name": "Definitions and their holders", "description": "Each definition with the school or body that holds it.", "questions": [ { "id": "definition-map-q01", "text": "Which definitions of length are in use, and which tradition or body holds each?", "kind": "definition" }, { "id": "definition-map-q02", "text": "What turns on the difference between them in practice?", "kind": "boundary" } ] } ] }, { "id": "operationalisation", "name": "Operationalisation", "description": "How it is measured or applied when it has to be.", "findings": [ { "id": "operational-record", "name": "Measures and proxies", "description": "Instruments and indicators used to stand in for it.", "questions": [ { "id": "operational-record-q01", "text": "How is length operationalised or measured in practice, and by what instrument?", "kind": "measurement" }, { "id": "operational-record-q02", "text": "What does that operationalisation leave out, and when does that matter?", "kind": "boundary" } ] } ] } ] }, { "id": "instances-and-use", "name": "Instances, use and consequence", "description": "What counts as an instance of length and what follows from calling something that.", "rationale": "Applying a concept is an act with consequences, so a model must say what the label licenses and what it does not.", "layers": [ { "id": "instances", "name": "What counts as an instance", "description": "Clear cases, borderline cases and non-cases.", "findings": [ { "id": "instance-tests", "name": "Tests for an instance", "description": "What would settle whether something falls under it.", "questions": [ { "id": "instance-tests-q01", "text": "What would settle whether something is an instance of length?", "kind": "boundary" }, { "id": "instance-tests-q02", "text": "Which borderline cases are argued about, and on what grounds?", "kind": "definition" } ] } ] }, { "id": "consequence", "name": "Consequence of application", "description": "Rights, duties or decisions that follow from the label.", "findings": [ { "id": "consequence-record", "name": "What the label licenses", "description": "What an agent may do once something is classified this way.", "questions": [ { "id": "consequence-record-q01", "text": "What follows practically once something is treated as length?", "kind": "action" }, { "id": "consequence-record-q02", "text": "What must an agent not infer from the label alone?", "kind": "action" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a length came from and when it held.", "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.", "layers": [ { "id": "source-and-authority", "name": "Source and authority", "description": "Who said it, on what evidence, and how strongly.", "findings": [ { "id": "claim-provenance", "name": "Claim provenance and confidence", "description": "The authority behind each claim about a length and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a length, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "claim-provenance-q02", "text": "Who or what asserted this about a claim about a length, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "claim-provenance-q03", "text": "What may an agent decide or do once a claim about a length is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "time-and-versions", "name": "Time, versions and supersession", "description": "When a claim was true, when it was learnt, and what replaced it.", "findings": [ { "id": "validity-and-supersession", "name": "Validity period and supersession", "description": "How an old claim about a length is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a length, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "validity-and-supersession-q02", "text": "Who or what asserted this about the validity of a claim about a length, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "validity-and-supersession-q03", "text": "What may an agent decide or do once the validity of a claim about a length is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 5, "layers": 10, "findings": 12, "questions": 32 } } } }