{ "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-07T10:28:21Z", "providers": [ "Codex", "Grok" ], "missingProviders": [], "pass": 2, "cost": { "grok": { "usd": 0.00471954, "turns": 1, "seconds": 65.3, "error": null }, "codex": { "seconds": 75.4, "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.3\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a07b68-464a-7cc3-8b62-6f9d88686d18\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: violin\nRegistry id: vr.tr.violin\nPlane / domain: PHY / PHY.OBJ\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\n\nContext fo" } }, "enrichment": { "pass": 3, "engine": "claude", "producedAt": "2026-10-06T11:00:00Z", "ingestedAt": "2026-10-06T08:01:41+00:00", "fields": [ "agent_conduct", "ethics", "failure_modes_and_hazards", "owners", "visual_identification" ] }, "revisions": [ { "at": "2026-10-07T11:41:04+00:00", "engine": "codex", "fields": [ "definition" ], "answering_review": "c4f9bb2aaba6c878f57cb276780ed8d3524f27c5e55a8773f99a22753928c1eb" } ], "gate": { "passed": true, "version": "1.0", "at": "2026-10-07T12:16:34+00:00", "evidence": [ "completeness 1.00", "sense: Wikidata description", "2 live sources", "review by codex: pass" ] } }, "metaModel": { "id": "THING-Q8355", "registryId": "vr.tr.violin", "name": "violin", "version": "0.1.0-research.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.OBJ" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q8355/", "model": { "registry_id": "vr.tr.violin", "name": "violin", "purpose": "Enable an AI agent to recognise a violin, assess its configuration and playing condition, and identify suitable use, setup or specialist care.", "definition": "The violin is a bowed chordophone of the Western classical family whose sound is produced by vibrating strings, typically with four strings tuned in fifths (G3-D4-A4-E5) and played under the chin; acoustic violins typically have a hollow wooden body, while electric variants may lack one, and some violins have additional strings.", "scope_statement": "This model owns the violin as a kind of physical musical instrument, including acoustic and electric variants, with fields for recording individual instruments without confusing the kind with a maker, product model or specimen.", "in_scope": [ "Violin identity and boundaries relative to neighbouring bowed string instruments", "Body, neck, fingerboard, strings and sound-producing configuration", "Instrument size, tuning, setup and player fit", "Playing capabilities and acoustic or amplified output", "Condition, maintenance needs and limits on safe intervention" ], "out_of_scope": [ "The bow as an independently maintained tool", "Viola, cello and other neighbouring instrument kinds", "Musical compositions, notation and repertoire", "Violin performance as a skill or occupation", "Amplifiers, effects units and recording systems", "Market valuation and ownership transactions" ], "distinguishing_features": [ "Identify the instrument through its intended violin role, construction and string configuration together; outline or size alone does not reliably separate a violin from a viola.", "Check whether the conventional four-string configuration and G-D-A-E tuning apply; record additional strings or alternative tuning explicitly rather than rejecting the instrument as a violin.", "Look for a neck, fingerboard and bridge arrangement permitting bowed access to individual strings; an electric violin may lack a conventional hollow body.", "Check its intended support and playing position, normally at the shoulder, against instruments designed primarily for upright support.", "Treat 'fiddle' as a possible name for the same instrument rather than automatically creating a separate physical kind." ], "characteristics": [ { "name": "Sound production configuration", "kind": "category", "unit_or_values": "acoustic; acoustic with pickup; electric; hybrid; unresolved", "why_it_matters": "Determines which resonating structures, electronics and output checks apply." }, { "name": "Nominal size designation", "kind": "category", "unit_or_values": "Recorded maker or supplier size label; unknown", "why_it_matters": "Supports instrument selection without assuming that fractional labels are literal dimensional ratios." }, { "name": "Body length", "kind": "measurement", "unit_or_values": "mm, with measurement endpoints recorded", "why_it_matters": "Provides a reproducible size observation alongside nominal labels." }, { "name": "Vibrating string length", "kind": "measurement", "unit_or_values": "mm between nut and bridge contact points", "why_it_matters": "Informs string compatibility, setup and playing reach." }, { "name": "String configuration", "kind": "category", "unit_or_values": "String count, ordered pitches, string type and product designation where known", "why_it_matters": "Distinguishes conventional and extended configurations and supports replacement decisions." }, { "name": "Tuning reference", "kind": "measurement", "unit_or_values": "Hz for a named reference pitch, with intended tuning recorded", "why_it_matters": "Allows tuning assessment against the actual musical requirement." }, { "name": "String clearance", "kind": "measurement", "unit_or_values": "mm for each string at a specified fingerboard location", "why_it_matters": "Helps assess playability and investigate buzzing or excessive stopping effort." }, { "name": "Structural and setup condition", "kind": "state", "unit_or_values": "Observed defects, affected components, inspection date and playability assessment", "why_it_matters": "Separates visible evidence from an unsupported claim that the instrument is safe to play." }, { "name": "Player fit", "kind": "relation", "unit_or_values": "Instrument linked to a player fit assessment and fitted supports", "why_it_matters": "An instrument's suitability depends on the player and setup rather than its size label alone." }, { "name": "Electrical requirements", "kind": "category", "unit_or_values": "Not applicable; passive pickup; active electronics with documented power and connection requirements", "why_it_matters": "Prevents treating every violin as electrically powered or every electric configuration as interchangeable." } ], "affordances": [ "Classify an instrument as a violin and document variant-specific evidence.", "Assess size and support compatibility for a particular player.", "Check tuning and select compatible replacement strings from documented specifications.", "Assess bowed and plucked response through appropriate playing checks.", "Connect an equipped instrument to a compatible amplification system.", "Identify maintenance needs and refer structural or sensitive setup work to a violin specialist." ], "agent_conduct": { "may": [ "Describe a violin's parts, condition and tuning.", "Help a player tune or practise with a violin they own." ], "must_not": [ "Misrepresent a violin's maker, age or label to raise its price.", "Export or import a violin with protected materials, such as some woods or ivory, without permits.", "Adjust or open a valuable instrument without the owner's approval.", "Store or ship a violin where heat or humidity will crack it." ], "requires_human": [ "Buying, selling or valuing a historic instrument.", "Restoration work on an old violin." ] }, "ethics": { "considerations": [ "Forged labels and false attributions defraud buyers and players.", "Some fittings use endangered woods or animal materials that trade rules protect." ], "affected_parties": [ "Players and students", "Buyers and collectors", "Instrument makers" ] }, "owners": { "steward": "The person who owns it; for historic instruments, provenance is held by its owner and dealers.", "master_systems": [] }, "visual_identification": [ "A hollow wooden body with a waist, f-shaped sound holes and a scroll at the end of the neck.", "Four strings over a bridge, played with a bow under the chin." ], "failure_modes_and_hazards": [ "Cracks and warping from heat, dryness or knocks.", "Hearing strain from long practice close to the ear.", "Fraud through fake labels and certificates." ], "what_it_is_for": [ "Violins are used for solo performance, chamber music, orchestral playing and many traditional musical styles.", "Players use bowing and plucking to produce melodic lines, accompaniment and varied articulations.", "They are also encountered in music education and instrument workshops, where size, setup and structural condition determine suitability for a player." ], "standards_and_regulation": [ "ISO 16, issued by the International Organization for Standardization, specifies standard musical tuning pitch and provides a reference when tuning a violin for ensemble performance." ] }, "sources": [ { "id": "grove", "title": "Violin", "url": "https://www.oxfordmusiconline.com/grovemusic/display/10.1093/gmo/9781561592630.001.0001/omo-9781561592630-e-0000041161", "what_it_supports": "Organological definition, history of the modern violin family, construction, and distinction from earlier fiddles.", "url_status": "unverified" }, { "id": "wikipedia", "title": "Violin - Wikipedia", "url": "https://en.wikipedia.org/wiki/Violin", "what_it_supports": "Construction, sizes, tuning, playing position, electric variants, and common measurements.", "url_status": "live" }, { "id": "wikidata", "title": "violin (Q8355) - Wikidata", "url": "https://www.wikidata.org/wiki/Q8355", "what_it_supports": "Stable identifiers (Q8355, Hornbostel-Sachs 321.322-71) and equivalent catalogue links.", "url_status": "live" }, { "id": "met", "title": "The Violin - Heilbrunn Timeline of Art History", "url": "https://www.metmuseum.org/toah/hd/vlin/hd_vlin.htm", "what_it_supports": "Cremonese making tradition, body form, and museum-documented historical instruments.", "url_status": "blocked" } ], "structure": { "bundles": [ { "id": "violin-identity", "name": "Violin identity", "description": "Establish which violin configuration is represented and how its identity is supported.", "rationale": "Violin identity cannot be reduced to body outline, a size label or an internal maker label.", "layers": [ { "id": "instrument-boundary", "name": "Instrument boundary", "description": "Separate the violin kind from neighbouring instruments and naming variants.", "findings": [ { "id": "violin-recognition", "name": "Violin recognition", "description": "Record the combination of construction, intended musical role and configuration supporting identification.", "questions": [ { "text": "What evidence identifies this instrument as a violin rather than a viola or another bowed string instrument?", "kind": "boundary", "id": "violin-recognition-q01" }, { "text": "Does a name such as fiddle describe this same instrument or a materially different local instrument tradition?", "kind": "definition", "id": "violin-recognition-q02" } ] } ] }, { "id": "variant-and-attribution", "name": "Variant and attribution", "description": "Record violin variants and distinguish observed inscriptions from verified attribution.", "findings": [ { "id": "configuration-and-maker-evidence", "name": "Configuration and maker evidence", "description": "Capture acoustic or electric construction, historical setup and maker claims with their evidence.", "questions": [ { "text": "Is this an acoustic, electric or hybrid violin, and does it have a documented historical or extended-string configuration?", "kind": "definition", "id": "configuration-and-maker-evidence-q01" }, { "text": "Which maker, date or model claims come from inscriptions, records or specialist examination?", "kind": "provenance", "id": "configuration-and-maker-evidence-q02" } ] } ] } ] }, { "id": "vibration-and-output", "name": "Vibration and output", "description": "Describe how string motion becomes audible sound or an electrical signal.", "rationale": "Acoustic and electric violins require different evidence about their sound-producing components.", "layers": [ { "id": "string-to-body-path", "name": "String-to-body path", "description": "Record the components carrying string vibration and the structures applicable to this variant.", "findings": [ { "id": "resonating-assembly", "name": "Resonating assembly", "description": "Identify strings, bridge, body and applicable internal acoustic components without assuming all variants share them.", "questions": [ { "text": "Which components transfer string vibration into the body or pickup in this violin?", "kind": "definition", "id": "resonating-assembly-q01" }, { "text": "Where applicable, what evidence records the condition of the plates, seams, bass bar and soundpost?", "kind": "provenance", "id": "resonating-assembly-q02" } ] } ] }, { "id": "electrical-signal-path", "name": "Electrical signal path", "description": "Describe fitted pickups, controls, connections and power requirements.", "findings": [ { "id": "amplified-output-configuration", "name": "Amplified output configuration", "description": "Record electrical dependencies only when the violin has an electrical output system.", "questions": [ { "text": "What pickup, output connector, controls and power source are fitted, if any?", "kind": "definition", "id": "amplified-output-configuration-q01" }, { "text": "What documented connection and power requirements must be met before testing amplified output?", "kind": "action", "id": "amplified-output-configuration-q02" } ] } ] } ] }, { "id": "strings-and-setup", "name": "Strings and setup", "description": "Record stringing, tuning and the geometry that governs stopping and bow access.", "rationale": "A recognisable violin may still be unplayable because its strings or setup are unsuitable.", "layers": [ { "id": "stringing-and-tuning", "name": "Stringing and tuning", "description": "Establish the intended pitches and compatible string configuration.", "findings": [ { "id": "intended-string-state", "name": "Intended string state", "description": "Record each string's identity, target pitch and compatibility evidence.", "questions": [ { "text": "How many strings are fitted, and what pitch and tuning reference are intended for each?", "kind": "measurement", "id": "intended-string-state-q01" }, { "text": "Which string specifications are compatible with this instrument's size, vibrating length and documented setup?", "kind": "action", "id": "intended-string-state-q02" } ] } ] }, { "id": "playing-geometry", "name": "Playing geometry", "description": "Assess bridge, nut, fingerboard and tuning hardware as a connected setup.", "findings": [ { "id": "clearance-and-bow-access", "name": "Clearance and bow access", "description": "Capture measurements and observations affecting stopping effort, unwanted contact and access to strings.", "questions": [ { "text": "What are the per-string clearances and vibrating lengths, and where were they measured?", "kind": "measurement", "id": "clearance-and-bow-access-q01" }, { "text": "Do bridge geometry, string spacing and fingerboard condition permit the intended bowing and stopping actions?", "kind": "action", "id": "clearance-and-bow-access-q02" }, { "text": "Do the pegs and any fine tuners hold and adjust pitch reliably?", "kind": "measurement", "id": "clearance-and-bow-access-q03" } ] } ] } ] }, { "id": "player-fit-and-response", "name": "Player fit and response", "description": "Relate the violin's dimensions and setup to a player and assess its musical response.", "rationale": "Size labels and isolated sound descriptions cannot establish whether a violin suits a player or use.", "layers": [ { "id": "fit-and-support", "name": "Fit and support", "description": "Record physical dimensions and the support arrangement used during assessment.", "findings": [ { "id": "player-instrument-fit", "name": "Player-instrument fit", "description": "Document reach and support observations alongside nominal size.", "questions": [ { "text": "What nominal size and measured body length does the violin have?", "kind": "measurement", "id": "player-instrument-fit-q01" }, { "text": "With the fitted chinrest and any shoulder support, can the intended player support the instrument and reach the required positions comfortably?", "kind": "action", "id": "player-instrument-fit-q02" } ] } ] }, { "id": "musical-response", "name": "Musical response", "description": "Record playable response under stated testing conditions.", "findings": [ { "id": "response-across-strings", "name": "Response across strings", "description": "Separate observed sound and response issues from preferences and uncertain causes.", "questions": [ { "text": "Under what player, bow, tuning and amplification conditions was response assessed?", "kind": "provenance", "id": "response-across-strings-q01" }, { "text": "Where do buzzing, uneven response, unstable notes or unwanted resonances occur during bowed and plucked checks?", "kind": "measurement", "id": "response-across-strings-q02" } ] } ] } ] }, { "id": "condition-and-care", "name": "Condition and care", "description": "Assess defects, care history and the interventions appropriate to this violin.", "rationale": "String tension, delicate setup and finish condition make the choice of intervention consequential.", "layers": [ { "id": "structural-condition", "name": "Structural condition", "description": "Locate defects and establish their implications for handling and playing.", "findings": [ { "id": "defects-and-playability", "name": "Defects and playability", "description": "Record cracks, open seams, deformation and component instability with inspection limits.", "questions": [ { "text": "Are there visible cracks, open seams, bridge deformation, neck movement or loose fittings, and where?", "kind": "measurement", "id": "defects-and-playability-q01" }, { "text": "Which observations require specialist assessment before tuning, playing or further handling?", "kind": "action", "id": "defects-and-playability-q02" } ] } ] }, { "id": "care-and-intervention", "name": "Care and intervention", "description": "Connect storage, consumables and repair history to justified maintenance actions.", "findings": [ { "id": "maintenance-boundaries", "name": "Maintenance boundaries", "description": "Distinguish supported routine care from work requiring instrument-specific expertise.", "questions": [ { "text": "What string changes, repairs, setup adjustments and environmental exposures are documented?", "kind": "provenance", "id": "maintenance-boundaries-q01" }, { "text": "Which cleaning, storage and string replacement procedures are supported for this instrument's finish and configuration?", "kind": "action", "id": "maintenance-boundaries-q02" }, { "text": "Which proposed bridge, soundpost, peg or structural interventions should be assigned to a violin specialist?", "kind": "action", "id": "maintenance-boundaries-q03" } ] } ] } ] }, { "id": "evidence-and-external-alignment", "name": "Evidence and external alignment", "description": "What the world already says about this thing, gathered so the model can be checked against it.", "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.", "layers": [ { "id": "reported-evidence", "name": "Reported evidence", "description": "Findings from the breadth pass, kept separate from the structural claims.", "findings": [ { "id": "evidence-kinds", "name": "Kinds and varieties", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "modern concert violin (full-size / 4/4, Stradivari-derived pattern)", "Baroque violin (gut strings, shorter neck, no chin rest or modern tailpiece)", "student / fractional-size violin (1/16 through 3/4)", "electric violin (solid-body or silent, magnetic or piezoelectric pickup)", "five-string violin (typically C-G-D-A-E)", "Hardanger fiddle (Hardingfele; sympathetic understrings)", "folk / fiddle variants used in Irish, Scottish, American, and other vernacular traditions", "historical reconstruction (Stainer, Amati, Guarneri patterns; period copies)" ], "questions": [ { "id": "evidence-kinds-q01", "text": "Which of these kinds and varieties hold for the sense of violin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-identifiers", "name": "Identifiers and schemes", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "scheme": "Wikidata", "value_or_pattern": "Q8355", "note": "Item for the violin as a type of musical instrument." }, { "scheme": "Hornbostel-Sachs", "value_or_pattern": "321.322-71", "note": "Necked box lute sounded by a bow; MIMO/Grove usage for the violin family." }, { "scheme": "MIMO / Hornbostel-Sachs (revised)", "value_or_pattern": "321.322-71", "note": "Same class as viola, cello, and double bass; size and tuning distinguish the violin." }, { "scheme": "Getty AAT", "value_or_pattern": "300042339", "note": "Art & Architecture Thesaurus concept for violins." }, { "scheme": "Library of Congress LCCN / LCSH", "value_or_pattern": "sh85143544 (Violin)", "note": "Subject heading; not a product identifier." }, { "scheme": "ISO 10957 (ISMN)", "value_or_pattern": "not applicable to the instrument itself", "note": "ISMN identifies printed music, not physical violins." } ], "questions": [ { "id": "evidence-identifiers-q01", "text": "Which of these identifiers and schemes hold for the sense of violin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-standards-and-regulation", "name": "Standards and regulation", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "ISO 13431 / related acoustics standards do not define the violin as a product; no single ISO type standard governs the instrument.", "CITES (Convention on International Trade in Endangered Species) - Appendix-listed woods (notably pernambuco for bows, some rosewoods) restrict international movement of instruments and bows.", "EU Timber Regulation / EU Deforestation Regulation (EUDR) and US Lacey Act - legality of timber in new instruments.", "IATA / airline musical-instrument carriage rules and national customs cultural-property rules for historic instruments (often with CITES musical-instrument certificates).", "ASTM F963 / EN 71 toy-safety standards may apply only to toy or very small children's instruments marketed as toys, not concert violins." ], "questions": [ { "id": "evidence-standards-and-regulation-q01", "text": "Which of these standards and regulation hold for the sense of violin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-real-world-use", "name": "Real-world use", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "Principal melody instrument of the Western symphony orchestra (first and second violin sections) and of the string quartet.", "Solo concerto, sonata, and recital instrument from the Baroque to the present.", "Vernacular dance and song accompaniment as the fiddle in Irish, Scottish, Appalachian, bluegrass, Nordic, and many other traditions.", "Studio, film, and popular-music session work, often with electric or five-string instruments.", "Music education: fractional sizes issued in school programmes from about age 4-5 upward.", "Museum object and investment-grade historical artefact (Cremonese and other Italian makers, 16th-18th c.)." ], "questions": [ { "id": "evidence-real-world-use-q01", "text": "Which of these real-world use hold for the sense of violin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-measurements", "name": "Typical measurements", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "quantity": "body (back) length, full-size 4/4", "typical_range": "352-360", "unit": "mm" }, { "quantity": "vibrating string length (stop)", "typical_range": "325-330", "unit": "mm" }, { "quantity": "overall length including scroll", "typical_range": "580-600", "unit": "mm" }, { "quantity": "string count (standard)", "typical_range": "4 (occasionally 5)", "unit": "count" }, { "quantity": "tuning (standard concert)", "typical_range": "G3-D4-A4-E5, A4 = 440 Hz (period practice 415-465 Hz)", "unit": "pitch" }, { "quantity": "mass of a modern 4/4 violin (no case)", "typical_range": "400-500", "unit": "g" }, { "quantity": "fractional sizes in common trade", "typical_range": "1/16, 1/10, 1/8, 1/4, 1/2, 3/4, 4/4", "unit": "nominal size" }, { "quantity": "bridge height / string clearance at board (typical modern setup)", "typical_range": "E ~3.0-3.5, G ~5.0-5.5", "unit": "mm" } ], "questions": [ { "id": "evidence-measurements-q01", "text": "Which of these typical measurements hold for the sense of violin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-failure-modes-and-hazards", "name": "Failure modes and hazards", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "Soundpost collapse or displacement after impact, humidity swing, or bridge collapse - can crack the table if played.", "Top (belly) or back cracks along the grain; bass-bar detachment; open seams from glue failure in dry or wet climates.", "Neck projection drop (fingerboard falling toward the table) from humidity cycling or a failed neck joint.", "Peg slippage or seizure; fine-tuner and tailgut failure; string breakage, especially the high-tension E string.", "Bow-hair contamination, stick camber loss, and frog/eyelet failure; pernambuco stick fracture.", "Hearing risk from prolonged high-level orchestral playing; chin and jaw musculoskeletal strain (temporomandibular, cervical).", "Allergic contact dermatitis from rosin (colophony) and from exotic woods or varnishes.", "Theft and damage in transit; irreversible loss of original varnish or wood from amateur repair." ], "questions": [ { "id": "evidence-failure-modes-and-hazards-q01", "text": "Which of these failure modes and hazards hold for the sense of violin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-regional-variation", "name": "Regional variation", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "English 'violin' vs vernacular 'fiddle': same instrument class, different repertoire, setup (flatter bridge, steel strings), and holding practice.", "Italy (Cremona, Brescia) as the historical making centre; French (Mirecourt), German/Austrian (Mittenwald, Markneukirchen), and Chinese factory production dominate later trade.", "Hardanger fiddle (Norway) and nyckelharpa (Sweden) are related bowed chordophones, not violins, but occupy the same social niche in those regions.", "Indian Carnatic and Hindustani practice: the violin is held against the chest or seated with the scroll on the ankle; tuning and ornament differ from Western practice.", "Baroque / historically informed performance uses gut strings, lower pitch, and a shorter, less-angled neck; 'modern' setup is a 19th-century Franco-German conversion.", "Fractional-size naming and millimetre body lengths are not fully standardised across makers and countries." ], "questions": [ { "id": "evidence-regional-variation-q01", "text": "Which of these regional variation hold for the sense of violin this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-neighbours", "name": "Neighbouring kinds and how to tell them apart", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "name": "viola", "difference": "Larger body (typically ~400 mm back) and tuned a fifth lower (C3-G3-D4-A4); same family, different pitch and role." }, { "name": "cello (violoncello)", "difference": "Held between the knees (or on an endpin), tuned C2-G2-D3-A3, body length ~750 mm; not a chin-held instrument." }, { "name": "viol / viola da gamba family", "difference": "Fretted, usually six strings, C-holes or similar, played on the lap or between the legs; different construction and tuning from the violin family." }, { "name": "rebec / medieval fiddle / lira da braccio", "difference": "Historical bowed chordophones ancestral or collateral to the violin; typically fewer strings, different body outline, and not the post-1550 Cremonese pattern." }, { "name": "kit / pochette", "difference": "A miniature dancing-master's violin with a very narrow body; not a fractional-size child's violin." }, { "name": "electric violin vs acoustic violin", "difference": "An electric violin is defined by a pickup and (usually) a non-acoustic body; it is a derived instrument, not a setup variant of a hollow wooden violin." } ], "questions": [ { "id": "evidence-neighbours-q01", "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of violin this model covers, and on what evidence?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Which authoritative organological sources best establish the boundary between violin variants, small violas and locally named fiddle traditions?", "Which size and setup measurement conventions should this model adopt, and how should maker-specific fractional size labels be represented?", "What evidence supports acceptable setup ranges for different sizes, string types and historical or electric configurations?", "Which care guidance supports environmental limits, cleaning methods and stop-playing criteria without imposing unsupported universal thresholds?", "Which standards or certification requirements, if any, apply to particular electric violin components or markets, and which issuing bodies maintain them?" ], "statistics": { "bundles": 6, "layers": 11, "findings": 18, "questions": 30 } }