{
    "model": {
        "rank": 3484,
        "code": "thing-q80019",
        "model_id": "vr.tr.double-bass",
        "name": "double bass",
        "purpose": "Enable an AI agent to recognise a double bass, assess its configuration and playing condition, and determine suitable performance, setup, handling and care actions.",
        "family": "Thing Registry",
        "category": "Physical world and living systems",
        "status": "research-draft",
        "kind": "thing",
        "plane": "PHY",
        "domain": "PHY.OBJ",
        "industry": "",
        "version": "",
        "url": "/models/thing/q80019/",
        "tier": 2,
        "score": 85,
        "payload": {
            "layer": "wikidata",
            "aliases": [],
            "aliasCount": 0,
            "merged": 0,
            "knownIn": 85,
            "facets": null,
            "markers": [],
            "lexicalClass": "",
            "senseRank": null,
            "alsoRegisteredAs": null,
            "source": {
                "dataset": "wikidata",
                "item": "Q80019",
                "url": "https://www.wikidata.org/wiki/Q80019",
                "license": "CC0 1.0"
            }
        },
        "research": {
            "vercy": "1.0-draft",
            "publication": {
                "status": "research-draft",
                "adjudicationStatus": "unreviewed",
                "publishableCanonical": false,
                "generatedAt": "2026-09-07T14:52:54Z",
                "providers": [
                    "Codex"
                ],
                "breadth": "recalled by Codex without web access - no source was read",
                "missingProviders": [],
                "pass": 2,
                "cost": {
                    "grok": {
                        "seconds": 24.7,
                        "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: 01a07c5a-7553-75d2-9228-d4a78c6cc489\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: double bass\nSense to describe: (none recorded)\nDomain code: PHY.OBJ\nAlso known as: (none)\n\n\nContext for this batch of 546 things:\n# Batch 003: 1001 regi",
                        "usd": 0,
                        "recall": true
                    },
                    "codex": {
                        "seconds": 76.9,
                        "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: 01a07c5a-756a-7363-a670-c751560d7b3c\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: double bass\nRegistry id: vr.tr.double-bass\nPlane / domain: PHY / PHY.OBJ\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\n\n"
                    }
                }
            },
            "metaModel": {
                "id": "THING-Q80019",
                "registryId": "vr.tr.double-bass",
                "name": "double bass",
                "version": "0.1.0-research.1",
                "entryKind": "thing",
                "family": "Thing Registry",
                "domain": [
                    "PHY.OBJ"
                ],
                "status": "research-draft"
            },
            "canonicalUrl": "https://ver.cy/models/thing/q80019/",
            "model": {
                "registry_id": "vr.tr.double-bass",
                "name": "double bass",
                "purpose": "Enable an AI agent to recognise a double bass, assess its configuration and playing condition, and determine suitable performance, setup, handling and care actions.",
                "definition": "A double bass is a large, low-pitched bowed string instrument with a resonating body and fretless fingerboard, usually fitted with four strings tuned in fourths, and played upright with a bow or by plucking.",
                "scope_statement": "This model owns the double bass as a kind of physical stringed musical instrument, including the features and states an agent must record about individual instruments; it distinguishes instrument configuration from maker, product model, performer and musical work.",
                "in_scope": [
                    "Identification of acoustic double basses and the boundary with electric upright variants",
                    "Body, neck, fingerboard, bridge, strings, tuning hardware and endpin configuration",
                    "String tuning, speaking length, playable range and range-extending equipment",
                    "Bowed and plucked operation, physical playing fit and sound production",
                    "Structural condition, setup, amplification interfaces and transport requirements"
                ],
                "out_of_scope": [
                    "Bass guitar construction and operation",
                    "Bows, amplifiers, pickups and cases as independently modelled accessory kinds",
                    "The player's proficiency, health or occupational role",
                    "Compositions, bass parts, notation systems and performance rights",
                    "Maker biographies, product catalogues and ownership transactions"
                ],
                "distinguishing_features": [
                    "Check for an upright playing configuration with a long neck, bridge-supported strings and a body normally supported from below by an endpin; body size alone does not establish identity.",
                    "Distinguish it from a bass guitar by its upright instrument geometry, fingerboard access and bridge configuration rather than by low register or amplification alone.",
                    "Distinguish it from a cello using the combined evidence of intended register, string configuration, speaking length, body proportions and playing posture; no single dimensional threshold is assumed.",
                    "For an acoustic example, check that the bridge couples the strings to a resonant body; for a reduced-body electric upright, record whether its design and playing geometry justify inclusion.",
                    "Distinguish it from historical bowed bass instruments through construction, tuning and documented identification rather than treating every large upright bowed instrument as a double bass."
                ],
                "characteristics": [
                    {
                        "name": "Instrument configuration",
                        "kind": "category",
                        "unit_or_values": "acoustic; acoustic with pickup; electric upright candidate; unresolved",
                        "why_it_matters": "Determines how sound is produced and whether the instrument falls within the model boundary."
                    },
                    {
                        "name": "String count",
                        "kind": "measurement",
                        "unit_or_values": "count",
                        "why_it_matters": "Affects range, neck layout and compatible setup."
                    },
                    {
                        "name": "Open-string tuning",
                        "kind": "state",
                        "unit_or_values": "ordered pitches with octave designation and reference frequency in Hz",
                        "why_it_matters": "Establishes the current pitch configuration without assuming every double bass uses the same tuning."
                    },
                    {
                        "name": "Speaking string length",
                        "kind": "measurement",
                        "unit_or_values": "mm, measured from the active upper termination to the bridge",
                        "why_it_matters": "Supports string selection and assessment of reach and setup."
                    },
                    {
                        "name": "Range extension",
                        "kind": "category",
                        "unit_or_values": "none; fingerboard extension with or without stops; additional string; other documented arrangement",
                        "why_it_matters": "Determines how pitches below the ordinary configuration are accessed."
                    },
                    {
                        "name": "Body construction",
                        "kind": "category",
                        "unit_or_values": "record materials and carved, laminated or mixed construction by component",
                        "why_it_matters": "Informs structural assessment and repair decisions without inferring quality from a label."
                    },
                    {
                        "name": "Body and transport dimensions",
                        "kind": "measurement",
                        "unit_or_values": "mm for overall length, body length, bout widths and depth",
                        "why_it_matters": "Supports case fit, storage and transport planning more reliably than nominal size alone."
                    },
                    {
                        "name": "String clearance",
                        "kind": "measurement",
                        "unit_or_values": "mm per string at a stated fingerboard position",
                        "why_it_matters": "Helps assess playability and whether setup suits the intended technique."
                    },
                    {
                        "name": "Bridge and fingerboard geometry",
                        "kind": "state",
                        "unit_or_values": "documented curvature, alignment, relief and visible wear",
                        "why_it_matters": "Affects clean bow access, stopping effort and unwanted contact noise."
                    },
                    {
                        "name": "Structural condition",
                        "kind": "state",
                        "unit_or_values": "observed cracks, seam openings, bridge deformation, neck movement and internal-support concerns, with inspection confidence",
                        "why_it_matters": "Determines whether playing or adjustment should pause pending specialist assessment."
                    },
                    {
                        "name": "Endpin configuration",
                        "kind": "state",
                        "unit_or_values": "extension in mm; angle if adjustable; lock security; tip and floor-contact condition",
                        "why_it_matters": "Controls playing height and support stability."
                    },
                    {
                        "name": "Installed signal system",
                        "kind": "relation",
                        "unit_or_values": "linked pickup, microphone, preamplifier and connector specifications, or none",
                        "why_it_matters": "Enables compatible amplification and separates acoustic faults from signal-chain faults."
                    }
                ],
                "affordances": [
                    "Identify the instrument and document uncertain boundaries with electric upright or historical bass instruments.",
                    "Determine available pitches from the actual strings, tuning and extension mechanism.",
                    "Assess suitability for bowed, plucked or mixed playing from setup and observed response.",
                    "Match strings, bows, cases and amplification equipment to recorded dimensions and interfaces.",
                    "Assess endpin support and playing-height adjustments before use.",
                    "Triage playing and structural problems and route bridge, soundpost or body work to an appropriate specialist."
                ]
            },
            "sources": [],
            "structure": {
                "bundles": [
                    {
                        "id": "identity-and-variant",
                        "name": "Identity and variant",
                        "description": "Establish which physical instrument configurations the double bass entry covers.",
                        "rationale": "Low pitch and upright posture alone cannot distinguish a double bass from neighbouring instrument kinds.",
                        "layers": [
                            {
                                "id": "instrument-boundary",
                                "name": "Instrument boundary",
                                "description": "Identify the instrument using construction and playing geometry.",
                                "findings": [
                                    {
                                        "id": "double-bass-identification",
                                        "name": "Double bass identification",
                                        "description": "Record evidence for identification without relying solely on a seller's label or nominal size.",
                                        "questions": [
                                            {
                                                "text": "Which observed body, neck, bridge and support features establish this instrument as a double bass?",
                                                "kind": "definition",
                                                "id": "double-bass-identification-q01"
                                            },
                                            {
                                                "text": "What distinguishes this example from a cello, bass guitar or historical bowed bass instrument?",
                                                "kind": "boundary",
                                                "id": "double-bass-identification-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "variant-and-attribution",
                                "name": "Variant and attribution",
                                "description": "Separate physical configuration from attributed maker and product identity.",
                                "findings": [
                                    {
                                        "id": "configuration-evidence",
                                        "name": "Configuration evidence",
                                        "description": "Record whether identification depends on acoustic construction, electric upright design or documentary evidence.",
                                        "questions": [
                                            {
                                                "text": "Does this electric upright variant belong within the registered double bass concept, and on what evidence?",
                                                "kind": "boundary",
                                                "id": "configuration-evidence-q01"
                                            },
                                            {
                                                "text": "Which labels, maker records or specialist assessments support its stated identity, and which remain unverified?",
                                                "kind": "provenance",
                                                "id": "configuration-evidence-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "strings-tuning-and-range",
                        "name": "Strings, tuning and range",
                        "description": "Describe the installed string system and the pitches its configuration permits.",
                        "rationale": "String count, tuning and extensions change the instrument's usable range and setup requirements.",
                        "layers": [
                            {
                                "id": "installed-string-system",
                                "name": "Installed string system",
                                "description": "Document strings and their active lengths rather than assuming a standard configuration.",
                                "findings": [
                                    {
                                        "id": "string-and-tuning-map",
                                        "name": "String and tuning map",
                                        "description": "Associate each installed string with its specification, speaking length and current open pitch.",
                                        "questions": [
                                            {
                                                "text": "How many strings are installed, and what is each string's open pitch and speaking length?",
                                                "kind": "measurement",
                                                "id": "string-and-tuning-map-q01"
                                            },
                                            {
                                                "text": "What manufacturer information establishes compatibility with this length and intended tuning?",
                                                "kind": "provenance",
                                                "id": "string-and-tuning-map-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "extended-register",
                                "name": "Extended register",
                                "description": "Identify how extra low pitches are produced and controlled.",
                                "findings": [
                                    {
                                        "id": "extension-operation",
                                        "name": "Extension operation",
                                        "description": "Record additional strings or extension mechanisms and their actual operating states.",
                                        "questions": [
                                            {
                                                "text": "What is the lowest available open pitch in each documented extension or stop configuration?",
                                                "kind": "measurement",
                                                "id": "extension-operation-q01"
                                            },
                                            {
                                                "text": "How are extension stops engaged and released, and what must be checked before changing their state?",
                                                "kind": "action",
                                                "id": "extension-operation-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "construction-and-sound",
                        "name": "Construction and sound",
                        "description": "Relate string vibration to the body or installed electrical signal system.",
                        "rationale": "Acoustic response, structural support and amplification depend on different parts of the double bass.",
                        "layers": [
                            {
                                "id": "acoustic-assembly",
                                "name": "Acoustic assembly",
                                "description": "Describe the bridge, resonant body and internal support where present.",
                                "findings": [
                                    {
                                        "id": "bridge-body-coupling",
                                        "name": "Bridge and body coupling",
                                        "description": "Record the construction and observable condition of the components that carry string load and transmit vibration.",
                                        "questions": [
                                            {
                                                "text": "What materials and construction methods are documented for the top, back and ribs?",
                                                "kind": "provenance",
                                                "id": "bridge-body-coupling-q01"
                                            },
                                            {
                                                "text": "What can inspection establish about bridge seating, internal supports and body integrity, and what remains inaccessible?",
                                                "kind": "measurement",
                                                "id": "bridge-body-coupling-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "amplified-output",
                                "name": "Amplified output",
                                "description": "Capture the installed transducer and its connection requirements.",
                                "findings": [
                                    {
                                        "id": "signal-path",
                                        "name": "Signal path",
                                        "description": "Distinguish the instrument's physical response from pickup, preamplifier and amplification behaviour.",
                                        "questions": [
                                            {
                                                "text": "Which transducer is installed, where is it mounted, and what power and input requirements are documented?",
                                                "kind": "provenance",
                                                "id": "signal-path-q01"
                                            },
                                            {
                                                "text": "What comparison of acoustic and amplified output would help locate a reported buzz, weak string or feedback problem?",
                                                "kind": "action",
                                                "id": "signal-path-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "playing-fit-and-response",
                        "name": "Playing fit and response",
                        "description": "Assess how instrument geometry supports the intended playing techniques.",
                        "rationale": "A double bass can be structurally sound yet poorly configured for a player's reach, bow access or plucking requirements.",
                        "layers": [
                            {
                                "id": "support-and-reach",
                                "name": "Support and reach",
                                "description": "Record the adjustable support and dimensions governing playing position.",
                                "findings": [
                                    {
                                        "id": "endpin-and-playing-height",
                                        "name": "Endpin and playing height",
                                        "description": "Assess stable support and access to the fingerboard in the intended posture.",
                                        "questions": [
                                            {
                                                "text": "What endpin extension and instrument position permit the intended player to reach the required fingerboard regions?",
                                                "kind": "measurement",
                                                "id": "endpin-and-playing-height-q01"
                                            },
                                            {
                                                "text": "What checks establish that the endpin lock and floor contact will hold during playing?",
                                                "kind": "action",
                                                "id": "endpin-and-playing-height-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "bowed-and-plucked-setup",
                                "name": "Bowed and plucked setup",
                                "description": "Relate string clearance and surface geometry to arco and pizzicato use.",
                                "findings": [
                                    {
                                        "id": "technique-dependent-response",
                                        "name": "Technique-dependent response",
                                        "description": "Document observed playing response alongside the intended technique and setup measurements.",
                                        "questions": [
                                            {
                                                "text": "What are the per-string clearances at stated reference points, and where does unwanted string contact occur?",
                                                "kind": "measurement",
                                                "id": "technique-dependent-response-q01"
                                            },
                                            {
                                                "text": "Can each string be bowed independently and plucked with the intended attack without unintended contact or persistent noise?",
                                                "kind": "action",
                                                "id": "technique-dependent-response-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "condition-care-and-movement",
                        "name": "Condition, care and movement",
                        "description": "Determine whether the instrument can be played, adjusted, stored or transported in its observed state.",
                        "rationale": "The tall supported form, loaded bridge and potentially vulnerable resonant body require instrument-specific decisions.",
                        "layers": [
                            {
                                "id": "condition-and-intervention",
                                "name": "Condition and intervention",
                                "description": "Separate routine adjustments from conditions needing a bass repair specialist.",
                                "findings": [
                                    {
                                        "id": "structural-triage",
                                        "name": "Structural triage",
                                        "description": "Record visible defects and changes in playing behaviour without treating remote observation as a complete inspection.",
                                        "questions": [
                                            {
                                                "text": "Are there cracks, open seams, bridge deformation, neck movement or sudden setup changes, and when were they first observed?",
                                                "kind": "measurement",
                                                "id": "structural-triage-q01"
                                            },
                                            {
                                                "text": "Which observed conditions require stopping use or obtaining specialist assessment before tuning or adjustment?",
                                                "kind": "action",
                                                "id": "structural-triage-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "storage-and-transport",
                                "name": "Storage and transport",
                                "description": "Plan support, environmental care and case fit for the actual construction and dimensions.",
                                "findings": [
                                    {
                                        "id": "protected-movement",
                                        "name": "Protected movement",
                                        "description": "Record how the instrument is supported and protected, including protruding extensions and installed electronics.",
                                        "questions": [
                                            {
                                                "text": "Do measured instrument dimensions, including any scroll extension, fit the proposed case and transport route?",
                                                "kind": "measurement",
                                                "id": "protected-movement-q01"
                                            },
                                            {
                                                "text": "What maker or repairer guidance governs environmental conditions, support points and preparation for transport?",
                                                "kind": "provenance",
                                                "id": "protected-movement-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-confidence-notes",
                                        "name": "Check these first",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "This describes the instrument kind, not a particular maker, product model or individual instrument.",
                                            "Fractional sizes such as three-quarter are conventional labels rather than reliable proportional dimensions; dimensions vary by maker.",
                                            "Standard tuning is given at sounding pitch; double-bass parts conventionally sound one octave below written pitch, and alternative tunings exist."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-confidence-notes-q01",
                                                "text": "Which of these check these first hold for the sense of double bass this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-kinds",
                                        "name": "Kinds and varieties",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "Four-string double bass",
                                            "Five-string double bass",
                                            "Four-string double bass with a low-C extension"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-kinds-q01",
                                                "text": "Which of these kinds and varieties hold for the sense of double bass this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-real-world-use",
                                        "name": "Real-world use",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "Providing the lowest string part in orchestras",
                                            "Playing bass lines and solos in jazz",
                                            "Providing rhythmic and harmonic support in bluegrass, folk and rockabilly",
                                            "Performing chamber music and solo repertoire"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-real-world-use-q01",
                                                "text": "Which of these real-world use hold for the sense of double bass this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-measurements",
                                        "name": "Typical measurements",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            {
                                                "quantity": "Vibrating string length on common adult instruments",
                                                "typical_range": "Approximately 104-110",
                                                "unit": "cm"
                                            },
                                            {
                                                "quantity": "Open-string pitches in standard four-string tuning",
                                                "typical_range": "E1, A1, D2, G2",
                                                "unit": "scientific pitch notation"
                                            },
                                            {
                                                "quantity": "Lowest standard open-string frequency at A4 = 440 Hz",
                                                "typical_range": "Approximately 41.2",
                                                "unit": "Hz"
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-measurements-q01",
                                                "text": "Which of these typical measurements hold for the sense of double bass this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-failure-modes-and-hazards",
                                        "name": "Failure modes and hazards",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "Humidity changes can cause cracks, open glue joints and changes in string height.",
                                            "A leaning or warped bridge can impair playing and may collapse under string tension.",
                                            "A displaced soundpost can impair tone and require professional resetting.",
                                            "Strings and bow hair wear and can break.",
                                            "Poor lifting technique or sustained awkward playing posture can cause musculoskeletal strain."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-failure-modes-and-hazards-q01",
                                                "text": "Which of these failure modes and hazards hold for the sense of double bass this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-regional-variation",
                                        "name": "Regional variation",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "French and German bow designs and grips coexist, with preferences varying by teaching tradition and ensemble.",
                                            "Low-C extensions and five-string instruments are alternative ways to obtain lower orchestral notes; their prevalence varies among orchestral traditions."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-regional-variation-q01",
                                                "text": "Which of these regional variation hold for the sense of double bass this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-neighbours",
                                        "name": "Neighbouring kinds and how to tell them apart",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            {
                                                "name": "cello",
                                                "difference": "The cello is smaller, normally tuned in fifths to C2-G2-D3-A3, and usually played seated with the body between the knees."
                                            },
                                            {
                                                "name": "bass guitar",
                                                "difference": "A bass guitar has a guitar-form body and playing position, usually has frets, and typically relies on electrical amplification."
                                            },
                                            {
                                                "name": "electric upright bass",
                                                "difference": "An electric upright bass preserves upright bass playing geometry but relies primarily on pickups and amplification rather than a full acoustic resonating body."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-neighbours-q01",
                                                "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of double bass this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "openQuestions": [
                "Does the registry intend electric upright basses to be included, or should they be represented by a neighbouring model?",
                "Which existing Vercy or world model, if any, already owns the double bass concept and should remain its single source of truth?",
                "Which authoritative references establish the boundary with historical bass viols and other large bowed bass instruments?",
                "Which measurement conventions and setup guidance should be used across differing string lengths, player needs and arco or pizzicato preferences?",
                "Which construction-specific care limits and specialist intervention criteria can be supported by maker or conservation sources?"
            ],
            "statistics": {
                "bundles": 6,
                "layers": 11,
                "findings": 17,
                "questions": 27
            }
        },
        "draft": {
            "generator": "vr.draft.v3",
            "status": "draft-generated",
            "researched": false,
            "archetype": "device, machine or tool",
            "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 double bass, record what state it is in, and decide what may be done with it.",
            "whatItIs": "Enable an AI agent to recognise a double bass, assess its configuration and playing condition, and determine suitable performance, setup, handling and care actions.",
            "characteristics": {
                "substance": "material",
                "origin": "manufactured",
                "agency": "inert",
                "mobility": "varies"
            },
            "whatYouCanDoWithIt": [
                "observed and measured"
            ],
            "distinguishingFeatures": [
                "Described in 85 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 double bass, and on what evidence are they told apart?"
            ],
            "whatItIsMadeOf": "matter you can touch",
            "physicalCharacter": [
                "Mobility varies between examples.",
                "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": [
                "Recognised by form, by the arrangement of its controls, and by markings - a plate, a model number, a certification mark. Form alone rarely separates two models that do very different things."
            ],
            "relatedModels": [],
            "standing": "Described in 85 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is.",
            "structure": {
                "bundles": [
                    {
                        "id": "identity-and-classification",
                        "name": "Identity, naming and classification",
                        "description": "How an agent tells one double bass from another, and a double bass 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 double bass, 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 double bass, 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 double bass 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 double bass, 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 double bass, 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 double bass 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 double bass 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 double bass, 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 double bass, 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 double bass 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 double bass from the things most often confused with it.",
                                        "questions": [
                                            {
                                                "id": "distinguishing-features-q01",
                                                "text": "What identifies and describes what distinguishes a double bass, 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 double bass, 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 double bass is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "form-and-composition",
                        "name": "Form, composition and condition",
                        "description": "What a double bass is made of, what shape and size it takes, and what state it is in.",
                        "rationale": "A physical thing can be measured, and a model that cannot record its measurements cannot support any decision that depends on them.",
                        "layers": [
                            {
                                "id": "form-and-dimensions",
                                "name": "Form and dimensions",
                                "description": "Shape, size, mass and the ranges these take across examples.",
                                "findings": [
                                    {
                                        "id": "measurable-dimensions",
                                        "name": "Measurable dimensions and their units",
                                        "description": "The quantities worth recording and the units they are recorded in.",
                                        "questions": [
                                            {
                                                "id": "measurable-dimensions-q01",
                                                "text": "What identifies and describes the dimensions of a double bass, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "measurable-dimensions-q02",
                                                "text": "Who or what asserted this about the dimensions of a double bass, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "measurable-dimensions-q03",
                                                "text": "What may an agent decide or do once the dimensions of a double bass is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "material-and-composition",
                                "name": "Material and composition",
                                "description": "Materials, parts and how they are put together.",
                                "findings": [
                                    {
                                        "id": "parts-and-materials",
                                        "name": "Parts and materials",
                                        "description": "What a double bass is built from and which parts are replaceable.",
                                        "questions": [
                                            {
                                                "id": "parts-and-materials-q01",
                                                "text": "What identifies and describes the composition of a double bass, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "parts-and-materials-q02",
                                                "text": "Who or what asserted this about the composition of a double bass, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "parts-and-materials-q03",
                                                "text": "What may an agent decide or do once the composition of a double bass is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "condition-and-integrity",
                                "name": "Condition and integrity",
                                "description": "Wear, damage, health and the difference between working and broken.",
                                "findings": [
                                    {
                                        "id": "condition-assessment",
                                        "name": "Condition, damage and health",
                                        "description": "How the condition of a double bass is judged and by whom.",
                                        "questions": [
                                            {
                                                "id": "condition-assessment-q01",
                                                "text": "What identifies and describes the condition of a double bass, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "condition-assessment-q02",
                                                "text": "Who or what asserted this about the condition of a double bass, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "condition-assessment-q03",
                                                "text": "What may an agent decide or do once the condition of a double bass is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "place-and-movement",
                        "name": "Place and movement",
                        "description": "Where a double bass is, how it got there and where it may go (varies).",
                        "rationale": "A thing that can move needs its position recorded with a time, or every later claim about it is about a place it has left.",
                        "layers": [
                            {
                                "id": "location-and-placement",
                                "name": "Location and placement",
                                "description": "Position, containment and the reference frame the position is given in.",
                                "findings": [
                                    {
                                        "id": "position-and-frame",
                                        "name": "Position, container and reference frame",
                                        "description": "Where a double bass is, and what that position is measured against.",
                                        "questions": [
                                            {
                                                "id": "position-and-frame-q01",
                                                "text": "What identifies and describes the location of a double bass, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "position-and-frame-q02",
                                                "text": "Who or what asserted this about the location of a double bass, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "position-and-frame-q03",
                                                "text": "What may an agent decide or do once the location of a double bass is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "movement-and-transfer",
                                "name": "Movement and transfer",
                                "description": "How a double bass is carried, installed or relocated.",
                                "findings": [
                                    {
                                        "id": "movement-events",
                                        "name": "Movement events and constraints",
                                        "description": "What counts as a movement, what records it and what limits it.",
                                        "questions": [
                                            {
                                                "id": "movement-events-q01",
                                                "text": "What identifies and describes the movement of a double bass, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "movement-events-q02",
                                                "text": "Who or what asserted this about the movement of a double bass, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "movement-events-q03",
                                                "text": "What may an agent decide or do once the movement of a double bass 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 double bass 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 double bass between them.",
                                        "questions": [
                                            {
                                                "id": "stages-and-transitions-q01",
                                                "text": "What identifies and describes the lifecycle of a double bass, 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 double bass, 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 double bass 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 double bass, how often and by whom.",
                                "findings": [
                                    {
                                        "id": "observation-record",
                                        "name": "Observation record",
                                        "description": "How an observation of a double bass 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 double bass, 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 double bass, 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 double bass is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "function-and-principle",
                        "name": "Function and operating principle",
                        "description": "What double bass is for and how it achieves it.",
                        "rationale": "Two devices with the same name can work on different principles, and the principle is what predicts failure and constrains use.",
                        "layers": [
                            {
                                "id": "intended-function",
                                "name": "Intended function",
                                "description": "The job it does, and the jobs it is used for anyway.",
                                "findings": [
                                    {
                                        "id": "function-record",
                                        "name": "Function, principle and variants",
                                        "description": "What it does, how, and which variants do it differently.",
                                        "questions": [
                                            {
                                                "id": "function-record-q01",
                                                "text": "What function does double bass perform, on what operating principle, and which variants differ in that principle?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "function-record-q02",
                                                "text": "What use falls outside the intended function but happens in practice?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "capacity-and-rating",
                                "name": "Capacity and rating",
                                "description": "The numbers that say what it can do and where it stops.",
                                "findings": [
                                    {
                                        "id": "ratings",
                                        "name": "Ratings and their conditions",
                                        "description": "Rated capacity, power, throughput and the conditions each assumes.",
                                        "questions": [
                                            {
                                                "id": "ratings-q01",
                                                "text": "What ratings characterise double bass, in what units, and under what stated conditions?",
                                                "kind": "measurement"
                                            },
                                            {
                                                "id": "ratings-q02",
                                                "text": "What happens beyond the rating - degradation, refusal, damage - and how is that detected?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "operation-and-state",
                        "name": "Operation, controls and state",
                        "description": "How double bass is operated and what state it is in right now.",
                        "rationale": "An agent acting on a device needs its current state and the controls that change it, not just its specification.",
                        "layers": [
                            {
                                "id": "controls-and-modes",
                                "name": "Controls and modes",
                                "description": "What can be set, what that changes, and what is interlocked.",
                                "findings": [
                                    {
                                        "id": "control-surface",
                                        "name": "Control surface and interlocks",
                                        "description": "The settings available and the conditions that block them.",
                                        "questions": [
                                            {
                                                "id": "control-surface-q01",
                                                "text": "What controls and modes does double bass have, and what does each change?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "control-surface-q02",
                                                "text": "Which actions are interlocked or forbidden in which state, and what must be true before acting?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "condition-and-maintenance",
                                "name": "Condition and maintenance",
                                "description": "Wear, service intervals, consumables and the line between working and broken.",
                                "findings": [
                                    {
                                        "id": "service-record",
                                        "name": "Condition, service and consumables",
                                        "description": "What is consumed, what is serviced, and how condition is judged.",
                                        "questions": [
                                            {
                                                "id": "service-record-q01",
                                                "text": "What consumables and service does double bass need, at what interval, and on whose authority?",
                                                "kind": "measurement"
                                            },
                                            {
                                                "id": "service-record-q02",
                                                "text": "What evidence separates a unit that is working from one that is out of service?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "kind-model-unit",
                        "name": "Kind, model and unit",
                        "description": "Whether a claim about double bass is about the kind, a product line, or one physical unit.",
                        "rationale": "This is the boundary most often got wrong for made things, and getting it wrong mixes a catalogue entry with the machine in the yard.",
                        "layers": [
                            {
                                "id": "level-of-reference",
                                "name": "Level of reference",
                                "description": "The three levels and what belongs at each.",
                                "findings": [
                                    {
                                        "id": "level-rules",
                                        "name": "What belongs to kind, model and unit",
                                        "description": "Which properties are shared by all of them and which are not.",
                                        "questions": [
                                            {
                                                "id": "level-rules-q01",
                                                "text": "Which facts about double bass hold for every one of them, which for a model, and which only for one unit?",
                                                "kind": "boundary"
                                            },
                                            {
                                                "id": "level-rules-q02",
                                                "text": "What identifies an individual unit, and what should an agent do when it has only the kind?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "standards-and-conformity",
                                "name": "Standards and conformity",
                                "description": "The standards a working example must meet and who attests it.",
                                "findings": [
                                    {
                                        "id": "conformity",
                                        "name": "Standards, marks and attestation",
                                        "description": "Which standard applies, who certifies, and what the mark means.",
                                        "questions": [
                                            {
                                                "id": "conformity-q01",
                                                "text": "Which standards govern double bass, issued by whom, and what does conformity actually assert?",
                                                "kind": "provenance"
                                            },
                                            {
                                                "id": "conformity-q02",
                                                "text": "What may an agent conclude from a certification mark, and what may it not?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "provenance-and-evidence",
                        "name": "Provenance, evidence and time",
                        "description": "Where every claim about a double bass 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 double bass and how confident it is.",
                                        "questions": [
                                            {
                                                "id": "claim-provenance-q01",
                                                "text": "What identifies and describes a claim about a double bass, 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 double bass, 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 double bass 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 double bass is retired without being erased.",
                                        "questions": [
                                            {
                                                "id": "validity-and-supersession-q01",
                                                "text": "What identifies and describes the validity of a claim about a double bass, 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 double bass, 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 double bass is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "statistics": {
                "bundles": 8,
                "layers": 17,
                "findings": 19,
                "questions": 51
            }
        }
    }
}