{ "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-07T14:29:32Z", "providers": [ "Codex", "Grok" ], "missingProviders": [], "pass": 2, "cost": { "grok": { "usd": 0.00868394, "turns": 1, "seconds": 149.6, "error": null }, "codex": { "seconds": 70.2, "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: 01a07c43-78f0-7111-9f7b-8389fb666ccd\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: viola\nRegistry id: vr.tr.viola\nPlane / domain: PHY / PHY.OBJ\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\nA Vercy model" } }, "enrichment": { "pass": 3, "engine": "claude", "producedAt": "2026-10-06T12:00:00Z", "ingestedAt": "2026-10-06T08:16:20+00:00", "fields": [ "agent_conduct", "ethics", "failure_modes_and_hazards", "owners", "standards_and_regulation", "visual_identification" ] }, "revisions": [ { "at": "2026-10-07T11:40:23+00:00", "engine": "codex", "fields": [ "definition", "visual_identification" ], "answering_review": "69f7abede516925aa04f7b44b3d64b72e3ffcce49c8429292a0dff9f0933eab2" } ], "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-Q80284", "registryId": "vr.tr.viola", "name": "viola", "version": "0.1.0-research.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.OBJ" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q80284/", "model": { "registry_id": "vr.tr.viola", "name": "viola", "purpose": "Enable an AI agent to recognise a viola, assess its playing condition and suitability, and decide which uses, adjustments or specialist interventions are appropriate.", "definition": "A bowed, unfretted, four-string necked-box lute of the violin family, tuned in fifths to C3-G3-D4-A4 and functioning as the alto voice of the modern string ensemble, typically with a larger body and longer vibrating string length than a violin but also made in violin-sized or unconventional forms.", "scope_statement": "This model owns an individual viola understood as a bowed string musical instrument, including its construction, fitted components, setup, condition and playing constraints; this interpretation remains provisional because the registry has no definition.", "in_scope": [ "Instrument identity and evidence that it is a viola", "Body dimensions, construction and acoustic or electric configuration", "Installed strings, tuning, bridge and other playing setup", "Structural condition, response and playability", "Fit to a player and constraints on handling, adjustment and repair" ], "out_of_scope": [ "Viola plants and other non-instrument meanings of the name", "Bows, cases and detachable accessories as independently managed objects", "The player's anatomy, technique and medical condition", "Musical works, notation and ensemble roles", "Ownership transactions, insurance contracts and market valuation" ], "distinguishing_features": [ "Compare documented instrument type, string configuration and intended register with violin and cello alternatives; appearance or tuning alone is insufficient.", "Record whether its intended playing position is at the shoulder or uses another support arrangement, distinguishing standard practice from adaptations.", "Measure body length, vibrating string length and body proportions; assess them together rather than assigning identity from a single size threshold.", "Inspect body, neck, frets and string arrangement when distinguishing a viola from a viol or viola da gamba.", "Check whether a violin-sized or unconventional body is explicitly constructed and set up as a viola rather than treating small size as disqualifying." ], "characteristics": [ { "name": "Instrument-type evidence", "kind": "category", "unit_or_values": "documented viola; physically assessed viola; uncertain attribution", "why_it_matters": "Prevents a label, silhouette or tuning from becoming the sole basis for identification." }, { "name": "Sound-generation configuration", "kind": "category", "unit_or_values": "acoustic; electric; electro-acoustic; unresolved", "why_it_matters": "Determines which body, pickup and amplification checks apply." }, { "name": "Body length", "kind": "measurement", "unit_or_values": "mm, with measurement landmarks and method", "why_it_matters": "Supports size identification and player-fit assessment without assuming a universal viola size." }, { "name": "Vibrating string length", "kind": "measurement", "unit_or_values": "mm between the string's nut and bridge contact points", "why_it_matters": "Informs string compatibility, reach and setup assessment." }, { "name": "Installed string configuration", "kind": "category", "unit_or_values": "string count, ordered pitches, string identifiers and intended tuning", "why_it_matters": "Distinguishes conventional and variant setups and constrains replacement or retuning." }, { "name": "String action", "kind": "measurement", "unit_or_values": "mm by string at explicitly identified fingerboard locations", "why_it_matters": "Helps explain stopping effort, clearance and unwanted contact." }, { "name": "Bridge posture and seating", "kind": "state", "unit_or_values": "documented alignment, foot contact, deformation and assessment confidence", "why_it_matters": "Supports decisions about continued playing and specialist setup inspection." }, { "name": "Structural integrity", "kind": "state", "unit_or_values": "observed cracks, open seams, deformation, movement and uninspected areas", "why_it_matters": "Separates cosmetic observations from unresolved conditions affecting use." }, { "name": "Playing response", "kind": "state", "unit_or_values": "tested response, buzzes, unevenness and problematic notes, with test conditions", "why_it_matters": "Links reported musical limitations to repeatable observations." }, { "name": "Player and support fit", "kind": "relation", "unit_or_values": "identified player, chinrest or shoulder support, reach observations and trial outcome", "why_it_matters": "Suitability depends on the player and support arrangement as well as instrument dimensions." } ], "affordances": [ "Identify and document the viola while preserving uncertainty about its type or attribution.", "Assess suitability for a particular player's reach, support arrangement and musical requirements.", "Check tuning and select compatible replacement strings using the instrument's documented setup.", "Conduct a bounded playing trial and record response problems under known conditions.", "Identify conditions requiring a luthier or electric-instrument specialist before further adjustment.", "Plan handling, storage and maintenance around the instrument's construction and observed condition." ], "agent_conduct": { "may": [ "Describe the viola, its range, tuning and repertoire from reliable sources.", "Record the provenance, maker attribution and condition of instruments in a collection." ], "must_not": [ "Attribute an instrument to a famous maker without expert evidence.", "Help trade instruments or bows with protected materials without required permits.", "Adjust, open or repair a valuable instrument without the owner's authority and a qualified luthier." ], "requires_human": [ "Valuing an instrument for sale or insurance.", "Accepting an instrument with doubtful provenance." ] }, "ethics": { "considerations": [ "Fine instruments carry great value and history; false attributions defraud buyers.", "Some bows and fittings use materials from endangered species." ], "affected_parties": [ "Players and owners", "Makers and luthiers", "Endangered species" ] }, "owners": { "steward": "The person who owns it.", "master_systems": [] }, "visual_identification": [ "A viola commonly has a violin-shaped body larger than a violin and is held under the chin, although violin-sized and unconventional forms also occur.", "Four strings with a lowest C string and music written mostly in alto clef." ], "failure_modes_and_hazards": [ "Heat and humidity changes crack the wood and loosen joints.", "Prolonged playing can cause repetitive strain injuries." ], "standards_and_regulation": [ "Convention on International Trade in Endangered Species of Wild Fauna and Flora, which governs some woods and materials used in instruments and bows." ], "what_it_is_for": [ "The viola provides the alto register in orchestras, string quartets and other chamber ensembles.", "It is also used as a solo instrument and in teaching, rehearsal and recording settings.", "Players normally support it between the shoulder and chin and sound its strings with a bow or by plucking." ] }, "sources": [ { "id": "wikipedia-viola", "title": "Viola", "url": "https://en.wikipedia.org/wiki/Viola", "what_it_supports": "Instrument identity, CGDA tuning, body-size practice, alto-clef use, and the usual confusions with violin, cello, viola da gamba, and viola d'amore.", "url_status": "live" }, { "id": "wikidata-q80284", "title": "viola (Q80284)", "url": "https://www.wikidata.org/wiki/Q80284", "what_it_supports": "Canonical Wikidata item for the musical instrument as distinct from the plant genus Viola and from guitar-family instruments called viola in Portuguese.", "url_status": "live" }, { "id": "grove-viola", "title": "Viola (The New Grove Dictionary of Music and Musicians / Grove Music Online)", "url": "", "what_it_supports": "Specialist history of the viola da braccio line, construction relative to the violin, and the lack of a single standardised body length." }, { "id": "hornbostel-sachs-1914", "title": "Systematik der Musikinstrumente: ein Versuch (Zeitschrift für Ethnologie, 1914)", "url": "", "what_it_supports": "Hornbostel-Sachs class 321.322 (necked box lute) with the bow suffix used for the violin family, including the viola." } ], "structure": { "bundles": [ { "id": "viola-identity", "name": "Viola identity", "description": "Establishes why this instrument belongs to the viola entry and which variant it represents.", "rationale": "Violas can overlap visually and dimensionally with neighbouring bowed instruments, so identity requires combined evidence.", "layers": [ { "id": "instrument-boundary", "name": "Instrument boundary", "description": "Tests the interpretation of viola against neighbouring instrument types.", "findings": [ { "id": "viola-identification-basis", "name": "Viola identification basis", "description": "Records supporting observations and unresolved conflicts without treating any single feature as decisive.", "questions": [ { "text": "What construction, intended register, playing position and documentation support identifying this instrument as a viola?", "kind": "definition", "id": "viola-identification-basis-q01" }, { "text": "What evidence distinguishes it from a violin, cello, viol or instrument converted to another role?", "kind": "boundary", "id": "viola-identification-basis-q02" } ] } ] }, { "id": "variant-and-attribution", "name": "Variant and attribution", "description": "Separates present configuration from claims about manufacture and earlier forms.", "findings": [ { "id": "documented-viola-variant", "name": "Documented viola variant", "description": "Captures acoustic or electric form, string-count variants and evidence behind maker or conversion claims.", "questions": [ { "text": "Which viola variant describes its present construction and intended use, and which features depart from that description?", "kind": "definition", "id": "documented-viola-variant-q01" }, { "text": "What records or inspections support its maker, date and any conversion history, beyond an internal label alone?", "kind": "provenance", "id": "documented-viola-variant-q02" } ] } ] } ] }, { "id": "body-scale-and-player-fit", "name": "Body scale and player fit", "description": "Connects the viola's physical dimensions with reach, support and practical handling.", "rationale": "A size designation alone does not establish whether a particular viola is manageable for a particular player.", "layers": [ { "id": "body-and-string-scale", "name": "Body and string scale", "description": "Records dimensions that distinguish the body envelope from the playing length.", "findings": [ { "id": "measured-viola-geometry", "name": "Measured viola geometry", "description": "Retains measurement methods so body length, neck geometry and string length can be compared reliably.", "questions": [ { "text": "What are the body length, bout widths, rib depth and vibrating string length, and how was each measured?", "kind": "measurement", "id": "measured-viola-geometry-q01" }, { "text": "Does any stated size designation accurately describe these measurements, or conceal an unusual body or neck configuration?", "kind": "boundary", "id": "measured-viola-geometry-q02" } ] } ] }, { "id": "playing-reach-and-support", "name": "Playing reach and support", "description": "Assesses this viola in relation to an identified player and fitted supports.", "findings": [ { "id": "player-fit-trial", "name": "Player-fit trial", "description": "Records observed reach and support limitations without inferring suitability from dimensions alone.", "questions": [ { "text": "With the recorded chinrest and shoulder-support arrangement, can the intended player reach the required positions and bow each string comfortably?", "kind": "measurement", "id": "player-fit-trial-q01" }, { "text": "Which support changes or further supervised trials are justified before accepting or rejecting this viola for that player?", "kind": "action", "id": "player-fit-trial-q02" } ] } ] } ] }, { "id": "strings-and-playing-setup", "name": "Strings and playing setup", "description": "Describes the installed string system and the geometry through which it is played.", "rationale": "String choice, tuning and setup jointly determine whether the viola can be used as intended.", "layers": [ { "id": "stringing-and-tuning", "name": "Stringing and tuning", "description": "Documents the actual strings and intended pitches, including variant tunings.", "findings": [ { "id": "compatible-string-system", "name": "Compatible string system", "description": "Connects installed strings with the instrument's scale, tuning and attachment hardware.", "questions": [ { "text": "What strings are installed, in what order and tuning, and what evidence establishes their compatibility with this viola's vibrating string length?", "kind": "definition", "id": "compatible-string-system-q01" }, { "text": "Which documented string replacements or tuning changes are suitable, and which require specialist assessment?", "kind": "action", "id": "compatible-string-system-q02" } ] } ] }, { "id": "bridge-fingerboard-and-tuning-hardware", "name": "Bridge, fingerboard and tuning hardware", "description": "Examines the contact geometry and hardware governing stopping, bow clearance and tuning.", "findings": [ { "id": "functional-setup-geometry", "name": "Functional setup geometry", "description": "Records action, spacing, bridge condition and tuning operation as an interacting setup.", "questions": [ { "text": "What are the measured string clearances and spacings, and what bridge or fingerboard observations explain restricted bow access or unwanted string contact?", "kind": "measurement", "id": "functional-setup-geometry-q01" }, { "text": "Do the pegs and fine tuners operate reliably, and which observed setup problems require a luthier's intervention?", "kind": "action", "id": "functional-setup-geometry-q02" } ] } ] } ] }, { "id": "structural-condition-and-intervention", "name": "Structural condition and intervention", "description": "Assesses the viola's load-bearing assembly and the implications of damage or earlier repairs.", "rationale": "A viola may remain playable while structural or setup defects still require limits on use and adjustment.", "layers": [ { "id": "body-neck-and-internal-support", "name": "Body, neck and internal support", "description": "Locates damage and uncertainty in the body, neck joint and applicable internal components.", "findings": [ { "id": "structural-condition-evidence", "name": "Structural condition evidence", "description": "Distinguishes visible observations from specialist conclusions and inaccessible areas.", "questions": [ { "text": "Where are cracks, open seams, deformation or joint movement observed, and which areas remain uninspected?", "kind": "measurement", "id": "structural-condition-evidence-q01" }, { "text": "For this construction, what inspection evidence exists for the soundpost, bass bar or other internal supports, where present?", "kind": "provenance", "id": "structural-condition-evidence-q02" } ] } ] }, { "id": "repair-and-use-limits", "name": "Repair and use limits", "description": "Connects repair history and current findings with permissible handling and intervention.", "findings": [ { "id": "condition-dependent-actions", "name": "Condition-dependent actions", "description": "Records supported decisions about playing, maintenance and referral without assuming that old repairs are either sound or defective.", "questions": [ { "text": "Which repairs or alterations are documented, and what evidence establishes their present stability?", "kind": "provenance", "id": "condition-dependent-actions-q01" }, { "text": "Given the observed condition, may playing continue, what handling limits apply, and what must a specialist assess before adjustment?", "kind": "action", "id": "condition-dependent-actions-q02" } ] } ] } ] }, { "id": "sound-response-and-readiness", "name": "Sound response and readiness", "description": "Determines whether this viola delivers usable response in its intended playing configuration.", "rationale": "Physical integrity alone does not establish musical readiness, and response judgments depend on how the viola was tested.", "layers": [ { "id": "bowed-response", "name": "Bowed response", "description": "Captures repeatable response observations across strings, positions and dynamics.", "findings": [ { "id": "response-test-evidence", "name": "Response test evidence", "description": "Associates tonal or mechanical symptoms with notes and controlled trial conditions.", "questions": [ { "text": "Under which player, bow, tuning and room conditions were response, balance, buzzes or unstable notes assessed?", "kind": "provenance", "id": "response-test-evidence-q01" }, { "text": "On which strings, pitches, positions and dynamics are problems repeatable, and what comparisons help separate instrument effects from trial conditions?", "kind": "measurement", "id": "response-test-evidence-q02" } ] } ] }, { "id": "configuration-specific-readiness", "name": "Configuration-specific readiness", "description": "Combines response evidence with the requirements of acoustic or amplified use.", "findings": [ { "id": "intended-use-readiness", "name": "Intended-use readiness", "description": "Records readiness for a specified use, including applicable onboard electronics and unresolved limitations.", "questions": [ { "text": "For an electric or electro-acoustic viola, do the fitted pickup, output and onboard controls function with the documented test equipment?", "kind": "measurement", "id": "intended-use-readiness-q01" }, { "text": "For the intended rehearsal, performance or practice use, is this viola ready, conditionally usable or awaiting intervention, and what evidence supports that decision?", "kind": "action", "id": "intended-use-readiness-q02" } ] } ] } ] }, { "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": [ "Full-size orchestral viola (about 16-16.5 in / 406-419 mm back length)", "Small adult or youth viola (15-15.5 in), the usual compromise for smaller players", "Fractional student viola (about 11-14 in), sized like fractional violins", "Tertis-model / wide-bodied viola (broader lower bouts, later 20th-century pattern)", "Baroque or period viola (gut strings, shorter neck, baroque bridge and fittings)", "Electric viola (solid or semi-hollow body, magnetic or piezo pickup)", "Five-string viola (CGDA plus a high E, or less often a low extension)", "Silent or practice viola (studio pickup instrument with little acoustic output)" ], "questions": [ { "id": "evidence-kinds-q01", "text": "Which of these kinds and varieties hold for the sense of viola 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": "Q80284", "note": "Musical instrument; not Q145393 (plant genus Viola)." }, { "scheme": "Hornbostel-Sachs", "value_or_pattern": "321.322-71", "note": "Necked box lute sounded with a bow; shared with violin and cello." }, { "scheme": "General MIDI", "value_or_pattern": "program 41 (Viola)", "note": "Timbre identifier in electronic scores, not a physical-object serial." }, { "scheme": "Harmonized System", "value_or_pattern": "9202.10", "note": "Bowed string instruments in customs classification; not viola-specific." } ], "questions": [ { "id": "evidence-identifiers-q01", "text": "Which of these identifiers and schemes hold for the sense of viola 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": [ "CITES (CITES Secretariat / parties): Appendix II listing of Paubrasilia echinata (pernambuco) governs trade in most professional viola bows; Dalbergia spp. listings cover many frogs and fittings.", "U.S. Lacey Act (U.S. Congress / USDA-APHIS): plant-product declaration and prohibition rules apply to tropical hardwoods in the instrument and bow.", "EU timber / deforestation rules (European Union): due-diligence on wood species and origin for instruments and bows placed on the EU market.", "MMA General MIDI specification (MIDI Manufacturers Association): program 41 as the conventional electronic viola voice; does not govern the acoustic instrument." ], "questions": [ { "id": "evidence-standards-and-regulation-q01", "text": "Which of these standards and regulation hold for the sense of viola 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": [ "Alto line in symphony orchestra and string orchestra, usually reading alto clef and switching to treble in high passages.", "Inner voice of the string quartet (two violins, viola, cello) and of piano quartets, string quintets, and similar chamber groups.", "Solo concerto and recital instrument (e.g. concertos by Walton, Bartók, Hindemith) and obbligato parts in opera and oratorio.", "School and conservatoire training instrument, often started from violin or from a fractional viola.", "Session, film, and studio work; folk, jazz, and some popular music; electric violas on amplified stages." ], "questions": [ { "id": "evidence-real-world-use-q01", "text": "Which of these real-world use hold for the sense of viola 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": "Back / body length", "typical_range": "380-420 (adult; 15-16.5 in); student fractionals lower", "unit": "mm" }, { "quantity": "Vibrating string length", "typical_range": "360-380", "unit": "mm" }, { "quantity": "Rib height", "typical_range": "32-40", "unit": "mm" }, { "quantity": "Instrument mass (without case)", "typical_range": "0.45-0.70", "unit": "kg" }, { "quantity": "Open-string pitches (A4 = 440 Hz)", "typical_range": "C3 130.81; G3 196.00; D4 293.66; A4 440.00", "unit": "Hz" }, { "quantity": "String count (standard acoustic)", "typical_range": "4", "unit": "count" } ], "questions": [ { "id": "evidence-measurements-q01", "text": "Which of these typical measurements hold for the sense of viola 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": [ "Wolf tone, most often near C-C♯ on the C string, from body-string coupling.", "Soundpost falling or crushing the plate after a knock, humidity swing, or bridge collapse.", "Open seams and plate cracks from impact or from glue failure in dry or wet air.", "Peg slip or seize; bridge warping or leaning toward the fingerboard under string tension.", "Bow-hair breakage, stick warp, and CITES/customs seizure of pernambuco bows in travel.", "Playing-related strain: left-shoulder and neck load from the larger reach and from chinrest/shoulder-rest setup; hearing risk in orchestral pits." ], "questions": [ { "id": "evidence-failure-modes-and-hazards-q01", "text": "Which of these failure modes and hazards hold for the sense of viola 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 viola, German Bratsche, French alto; Italian viola historically also named the whole da-braccio family (viola da braccio vs viola da gamba).", "In Portuguese (Portugal and Brazil), viola usually means a guitar-family instrument (viola caipira, viola braguesa), not the bowed alto.", "No single international body length: many North American and British orchestral players prefer 16-16.5 in; 15.5-16 in is common for smaller adults in several European scenes.", "Historical English 'tenor violin' and some Central European 'Tenorgeige' labels overlap the large-viola / small-tenor zone." ], "questions": [ { "id": "evidence-regional-variation-q01", "text": "Which of these regional variation hold for the sense of viola 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": "Violin", "difference": "Smaller standardised back (~356 mm), open strings G3-D4-A4-E5, treble clef as home clef; viola is larger, has a low C string, and lives in alto clef." }, { "name": "Cello (violoncello)", "difference": "Played upright between the knees with an endpin; tuned C2-G2-D3-A3, an octave below the viola, and far larger." }, { "name": "Viola da gamba", "difference": "Viol family: fretted fingerboard, typically six or seven strings, different tunings, underhand bow, held on or between the legs - not a violin-family alto." }, { "name": "Viola d'amore", "difference": "Usually six or seven playing strings plus sympathetic strings under the fingerboard; different outline and tuning, even when held like a viola." }, { "name": "Portuguese / Brazilian viola (guitar family)", "difference": "Plucked, often multi-course guitar relative; naming collision only, separated by playing method, stringing, and Hornbostel-Sachs class." }, { "name": "Viola pomposa / viola da spalla / vertical viola", "difference": "Held across the chest or more cello-like; extra string or tenor range; treated as related historical or experimental types, not the standard shoulder-held orchestral viola." } ], "questions": [ { "id": "evidence-neighbours-q01", "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of viola this model covers, and on what evidence?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Does vr.tr.viola explicitly denote the musical instrument, and does an existing world model already own this concept?", "Which historical, electric, extended-range or adapted viola forms must this registry entry include?", "Which authoritative measurement conventions and size terminology should be used across different viola designs?", "What construction-specific evidence should distinguish routine player maintenance from adjustments requiring a luthier?", "Which repeatable playing assessments and expert criteria can support readiness decisions without presenting tonal preference as an objective defect?" ], "statistics": { "bundles": 6, "layers": 11, "findings": 18, "questions": 28 } }