{
    "model": {
        "rank": 3788,
        "code": "thing-q131168",
        "model_id": "vr.tr.tuba",
        "name": "tuba",
        "purpose": "Enable an agent to recognise a tuba, assess its musical suitability and physical condition, and determine appropriate playing, handling and maintenance 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/q131168/",
        "tier": 2,
        "score": 82,
        "payload": {
            "layer": "wikidata",
            "aliases": [
                "valved ophicleide",
                "euphonium",
                "subcontrabass tuba",
                "helicon",
                "double bell euphonium",
                "soprano helicon"
            ],
            "aliasCount": 6,
            "merged": 6,
            "knownIn": 82,
            "facets": null,
            "markers": [],
            "lexicalClass": "",
            "senseRank": null,
            "alsoRegisteredAs": null,
            "source": {
                "dataset": "wikidata",
                "item": "Q131168",
                "url": "https://www.wikidata.org/wiki/Q131168",
                "license": "CC0 1.0"
            }
        },
        "research": {
            "vercy": "1.0-draft",
            "publication": {
                "status": "research-draft",
                "adjudicationStatus": "unreviewed",
                "publishableCanonical": false,
                "generatedAt": "2026-09-07T15:09:27Z",
                "providers": [
                    "Codex"
                ],
                "breadth": "recalled by Codex without web access - no source was read",
                "missingProviders": [],
                "pass": 2,
                "cost": {
                    "grok": {
                        "seconds": 22,
                        "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: 01a07c69-9bd3-7382-92a9-78d5d11d7345\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: tuba\nSense to describe: (none recorded)\nDomain code: PHY.OBJ\nAlso known as: (none)\n\n\nContext for this batch of 801 things:\n# Batch 004: 1001 registered ",
                        "usd": 0,
                        "recall": true
                    },
                    "codex": {
                        "seconds": 77.2,
                        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.3\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a07c69-9bad-7df0-99db-049d34a7c73b\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: tuba\nRegistry id: vr.tr.tuba\nPlane / domain: PHY / PHY.OBJ\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\n\nContext for th"
                    }
                }
            },
            "metaModel": {
                "id": "THING-Q131168",
                "registryId": "vr.tr.tuba",
                "name": "tuba",
                "version": "0.1.0-research.1",
                "entryKind": "thing",
                "family": "Thing Registry",
                "domain": [
                    "PHY.OBJ"
                ],
                "status": "research-draft"
            },
            "canonicalUrl": "https://ver.cy/models/thing/q131168/",
            "model": {
                "registry_id": "vr.tr.tuba",
                "name": "tuba",
                "purpose": "Enable an agent to recognise a tuba, assess its musical suitability and physical condition, and determine appropriate playing, handling and maintenance actions.",
                "definition": "A tuba is a low-register brass wind instrument in which the player's vibrating lips excite an air column in a predominantly conical tube, with valves changing the effective tube length to select pitches.",
                "scope_statement": "This model owns the tuba as a kind of low-register brass wind instrument, including the configuration and condition evidence needed to assess particular examples; manufacturer models and individual instruments are instances rather than separate kinds.",
                "in_scope": [
                    "Identification and boundaries of the musical-instrument sense of tuba",
                    "Air-column configuration, nominal pitch and valve-controlled tube lengths",
                    "Mouthpiece interface, playing response and practical musical capability",
                    "Playing orientation, support, transport and storage requirements",
                    "Condition of tubing, valves, slides, joints and finishes"
                ],
                "out_of_scope": [
                    "Performer identity, competence and health as independent subjects",
                    "Compositions, notation systems and ensemble arrangements",
                    "Manufacturer organisations, product catalogues and sales transactions",
                    "Detailed metallurgy and manufacturing processes",
                    "Euphoniums, trombones and other neighbouring brass instrument kinds"
                ],
                "distinguishing_features": [
                    "Sound is initiated by the player's vibrating lips at a mouthpiece, distinguishing a tuba from reed-driven and edge-blown wind instruments.",
                    "A predominantly expanding bore and flared bell distinguish its acoustic construction from predominantly cylindrical brass instruments; external size alone is insufficient.",
                    "The normal playing configuration uses valves to select additional tubing, rather than a trombone's continuously movable main playing slide.",
                    "Classification against a euphonium requires evidence about nominal pitch, acoustic scale, register and established instrument designation, rather than bell size alone.",
                    "Names containing 'tuba' require checking against construction and musical usage; the name alone does not establish membership."
                ],
                "characteristics": [
                    {
                        "name": "Instrument designation",
                        "kind": "category",
                        "unit_or_values": "Documented family designation and local or historical names",
                        "why_it_matters": "Separates physical identification from potentially ambiguous naming conventions."
                    },
                    {
                        "name": "Nominal pitch",
                        "kind": "category",
                        "unit_or_values": "Declared pitch designation, preserving octave notation where supplied",
                        "why_it_matters": "Supports instrument selection and interpretation of fingering and register."
                    },
                    {
                        "name": "Bore profile",
                        "kind": "measurement",
                        "unit_or_values": "Internal diameter in mm at identified positions along the air path",
                        "why_it_matters": "Describes acoustic scale more reliably than a single unqualified bore number."
                    },
                    {
                        "name": "Valve configuration",
                        "kind": "category",
                        "unit_or_values": "Valve count, piston or rotary mechanism, routing and any compensating arrangement",
                        "why_it_matters": "Determines available tube-length changes and the mechanisms requiring inspection."
                    },
                    {
                        "name": "Valve and slide function",
                        "kind": "state",
                        "unit_or_values": "Observed travel, return, alignment, leakage and slide mobility; untested where unknown",
                        "why_it_matters": "Establishes whether pitch controls operate reliably."
                    },
                    {
                        "name": "Mouthpiece compatibility",
                        "kind": "relation",
                        "unit_or_values": "Compatible shank and receiver specifications with observed fit",
                        "why_it_matters": "Prevents inappropriate fitting and helps explain response problems."
                    },
                    {
                        "name": "Bell geometry and orientation",
                        "kind": "measurement",
                        "unit_or_values": "Bell diameter in mm and bell-axis direction relative to playing position",
                        "why_it_matters": "Supports identification, placement and clearance decisions."
                    },
                    {
                        "name": "Supported playing envelope",
                        "kind": "measurement",
                        "unit_or_values": "Sounding pitches and tuning deviations in cents under recorded test conditions",
                        "why_it_matters": "Distinguishes demonstrated musical capability from assumed capability."
                    },
                    {
                        "name": "Mass and handling dimensions",
                        "kind": "measurement",
                        "unit_or_values": "Mass in kg; overall dimensions in mm; accessories included or excluded explicitly",
                        "why_it_matters": "Informs support, carrying and case selection."
                    },
                    {
                        "name": "Air-path integrity",
                        "kind": "state",
                        "unit_or_values": "Observed leaks, obstructions, dents, corrosion and joint defects with locations",
                        "why_it_matters": "Connects physical damage to playability and repair needs."
                    }
                ],
                "affordances": [
                    "Match an identified tuba configuration to a requested sounding register and playing context.",
                    "Check mouthpiece, support and case compatibility against documented interfaces and dimensions.",
                    "Guide inspection of valves, slides, water keys and accessible tubing.",
                    "Record playing tests and distinguish configuration limitations from suspected faults.",
                    "Select documented routine care or refer faults for specialist repair.",
                    "Plan supported positioning, lifting, transport and storage around the instrument's geometry."
                ]
            },
            "sources": [],
            "structure": {
                "bundles": [
                    {
                        "id": "identity-and-family-boundaries",
                        "name": "Identity and family boundaries",
                        "description": "Establishes which instrument sense and physical configuration the tuba model covers.",
                        "rationale": "Tuba names, related brass instruments and body layouts do not provide interchangeable classification evidence.",
                        "layers": [
                            {
                                "id": "instrument-membership",
                                "name": "Instrument membership",
                                "description": "Tests classification using acoustic construction and documented designation.",
                                "findings": [
                                    {
                                        "id": "construction-based-identification",
                                        "name": "Construction-based identification",
                                        "description": "Record how lip excitation, bore profile, pitch-control mechanism and intended register support identification as a tuba.",
                                        "questions": [
                                            {
                                                "text": "What observed construction features support identifying this instrument as a tuba?",
                                                "kind": "definition",
                                                "id": "construction-based-identification-q01"
                                            },
                                            {
                                                "text": "What evidence distinguishes it from a euphonium, trombone or an instrument merely named 'tuba'?",
                                                "kind": "boundary",
                                                "id": "construction-based-identification-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "designation-and-variant",
                                "name": "Designation and variant",
                                "description": "Connects names and configurations without confusing a kind with a manufacturer's model.",
                                "findings": [
                                    {
                                        "id": "documented-variant",
                                        "name": "Documented variant",
                                        "description": "Capture the source of family, pitch and body-layout designations, retaining conflicting terminology.",
                                        "questions": [
                                            {
                                                "text": "Which markings, maker documentation or collection records establish the designation?",
                                                "kind": "provenance",
                                                "id": "documented-variant-q01"
                                            },
                                            {
                                                "text": "Does the designation identify a tuba variant, a product model or a neighbouring instrument kind?",
                                                "kind": "boundary",
                                                "id": "documented-variant-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "air-column-and-pitch-control",
                        "name": "Air column and pitch control",
                        "description": "Describes the resonating air path and the mechanisms that change its effective length.",
                        "rationale": "Nominal pitch alone cannot explain a tuba's valve combinations, tuning adjustments or low-register capability.",
                        "layers": [
                            {
                                "id": "open-air-path",
                                "name": "Open air path",
                                "description": "Records the unvalved acoustic configuration and its tuning reference.",
                                "findings": [
                                    {
                                        "id": "nominal-pitch-and-geometry",
                                        "name": "Nominal pitch and geometry",
                                        "description": "Relate the declared pitch to documented bore geometry and measured open-note behaviour.",
                                        "questions": [
                                            {
                                                "text": "What nominal pitch and reference tuning are documented for this configuration?",
                                                "kind": "provenance",
                                                "id": "nominal-pitch-and-geometry-q01"
                                            },
                                            {
                                                "text": "Which open sounding pitches and tuning deviations are observed under stated conditions?",
                                                "kind": "measurement",
                                                "id": "nominal-pitch-and-geometry-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "valve-routing-and-slides",
                                "name": "Valve routing and slides",
                                "description": "Captures valve-selected tubing and available tuning adjustments.",
                                "findings": [
                                    {
                                        "id": "pitch-changing-paths",
                                        "name": "Pitch-changing paths",
                                        "description": "Record each valve's intended effect, combination routing and any compensating paths or alternate configurations.",
                                        "questions": [
                                            {
                                                "text": "What tubing does each valve or combination add, and is a compensating arrangement documented?",
                                                "kind": "definition",
                                                "id": "pitch-changing-paths-q01"
                                            },
                                            {
                                                "text": "Which slides are intended for tuning adjustment, and what movement is permitted by the maker's instructions?",
                                                "kind": "action",
                                                "id": "pitch-changing-paths-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "player-interface-and-musical-response",
                        "name": "Player interface and musical response",
                        "description": "Connects the mouthpiece and controls to demonstrated playing behaviour.",
                        "rationale": "A tuba's useful response depends on interface compatibility, player interaction and test conditions.",
                        "layers": [
                            {
                                "id": "mouthpiece-and-control-access",
                                "name": "Mouthpiece and control access",
                                "description": "Assesses the fit and accessibility of the player's immediate interfaces.",
                                "findings": [
                                    {
                                        "id": "interface-compatibility",
                                        "name": "Interface compatibility",
                                        "description": "Record mouthpiece seating, receiver condition and access to valves and adjustable slides in playing position.",
                                        "questions": [
                                            {
                                                "text": "What receiver and mouthpiece-shank evidence establishes a secure, appropriate fit?",
                                                "kind": "measurement",
                                                "id": "interface-compatibility-q01"
                                            },
                                            {
                                                "text": "Can the intended player reach the valves and required slides while the instrument is adequately supported?",
                                                "kind": "action",
                                                "id": "interface-compatibility-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "response-and-intonation",
                                "name": "Response and intonation",
                                "description": "Separates tested sounding behaviour from categorical assumptions about range or quality.",
                                "findings": [
                                    {
                                        "id": "documented-playing-test",
                                        "name": "Documented playing test",
                                        "description": "Capture note response, intonation and instability together with the player, mouthpiece, tuning and environmental conditions.",
                                        "questions": [
                                            {
                                                "text": "Which sounding notes, valve combinations and dynamic levels were tested, and what response or tuning problems occurred?",
                                                "kind": "measurement",
                                                "id": "documented-playing-test-q01"
                                            },
                                            {
                                                "text": "What evidence helps distinguish an instrument fault from mouthpiece mismatch, player interaction or test conditions?",
                                                "kind": "boundary",
                                                "id": "documented-playing-test-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "playing-support-and-transport",
                        "name": "Playing support and transport",
                        "description": "Addresses the tuba's bulk, bell clearance and supported orientation during use and movement.",
                        "rationale": "Body layout and mass affect whether a tuba can be positioned, carried and stored without damage or loss of control.",
                        "layers": [
                            {
                                "id": "supported-playing-position",
                                "name": "Supported playing position",
                                "description": "Records intended posture, load support and clearance around projecting parts.",
                                "findings": [
                                    {
                                        "id": "load-and-orientation",
                                        "name": "Load and orientation",
                                        "description": "Identify how the instrument is supported while maintaining mouthpiece position and access to controls.",
                                        "questions": [
                                            {
                                                "text": "What mass, body dimensions and bell orientation must the playing arrangement accommodate?",
                                                "kind": "measurement",
                                                "id": "load-and-orientation-q01"
                                            },
                                            {
                                                "text": "Which documented support or carrying arrangements suit this body configuration and playing context?",
                                                "kind": "action",
                                                "id": "load-and-orientation-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "case-and-storage-fit",
                                "name": "Case and storage fit",
                                "description": "Assesses protection for the bell, valve assembly and exposed tubing.",
                                "findings": [
                                    {
                                        "id": "protected-movement-and-rest",
                                        "name": "Protected movement and rest",
                                        "description": "Record case support, retained accessories and stable resting arrangements using actual geometry.",
                                        "questions": [
                                            {
                                                "text": "Does the proposed case support the instrument without loading vulnerable tubing, valves or the bell rim?",
                                                "kind": "measurement",
                                                "id": "protected-movement-and-rest-q01"
                                            },
                                            {
                                                "text": "What handling and storage instructions apply to this configuration and its removable components?",
                                                "kind": "action",
                                                "id": "protected-movement-and-rest-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "condition-and-care",
                        "name": "Condition and care",
                        "description": "Connects tuba-specific defects and service requirements to permitted actions.",
                        "rationale": "Air leaks, damaged tubing and sluggish pitch controls require different responses and should not be collapsed into a single condition rating.",
                        "layers": [
                            {
                                "id": "air-path-and-mechanism-condition",
                                "name": "Air-path and mechanism condition",
                                "description": "Locates defects in resonating tubing, valves, slides, water keys and joints.",
                                "findings": [
                                    {
                                        "id": "functional-defect-evidence",
                                        "name": "Functional defect evidence",
                                        "description": "Record observed damage and malfunction, distinguishing inspection evidence from inferred acoustic effects.",
                                        "questions": [
                                            {
                                                "text": "Where are leaks, obstructions, dents, loose joints or corrosion observed, and how were they detected?",
                                                "kind": "measurement",
                                                "id": "functional-defect-evidence-q01"
                                            },
                                            {
                                                "text": "Do valves return and align correctly, and do slides and water keys operate as intended?",
                                                "kind": "measurement",
                                                "id": "functional-defect-evidence-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "routine-care-and-repair-boundary",
                                "name": "Routine care and repair boundary",
                                "description": "Determines appropriate cleaning, lubrication and specialist intervention.",
                                "findings": [
                                    {
                                        "id": "configuration-specific-service",
                                        "name": "Configuration-specific service",
                                        "description": "Tie care actions and consumables to the valve mechanism, materials, finish and documented service instructions.",
                                        "questions": [
                                            {
                                                "text": "Which cleaning methods, lubricants and service intervals are specified for this valve mechanism and finish?",
                                                "kind": "provenance",
                                                "id": "configuration-specific-service-q01"
                                            },
                                            {
                                                "text": "Which observed defects permit routine care, and which require a qualified brass-instrument repairer before further action?",
                                                "kind": "action",
                                                "id": "configuration-specific-service-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 musical-instrument kind, not a manufacturer's model or an individual instrument.",
                                            "Tube lengths are approximate nominal values; dimensions, mass and practical playing range depend substantially on design and performer.",
                                            "Regional instrument preferences are tendencies, and the scope of the tuba family varies between classification traditions."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-confidence-notes-q01",
                                                "text": "Which of these check these first hold for the sense of tuba 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": [
                                            "F bass tuba",
                                            "E-flat bass tuba",
                                            "CC contrabass tuba",
                                            "BB-flat contrabass tuba",
                                            "Sousaphone",
                                            "Helicon"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-kinds-q01",
                                                "text": "Which of these kinds and varieties hold for the sense of tuba this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-identifiers",
                                        "name": "Identifiers and schemes",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            {
                                                "scheme": "Instrument pitch designation",
                                                "value_or_pattern": "F, E-flat, CC, BB-flat",
                                                "note": "Names the nominal fundamental of the open tubing; CC and BB-flat conventionally identify contrabass tubas, rather than prescribing written transposition."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-identifiers-q01",
                                                "text": "Which of these identifiers and schemes hold for the sense of tuba 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 bass lines and harmonic support in orchestras and concert bands.",
                                            "Playing bass parts in brass bands.",
                                            "Performing in brass quintets and other chamber ensembles.",
                                            "Providing a mobile bass voice in marching bands, particularly through sousaphones and helicons.",
                                            "Playing solo repertoire and bass parts in jazz and traditional ensembles."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-real-world-use-q01",
                                                "text": "Which of these real-world use hold for the sense of tuba 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": "Approximate open-tube length by nominal pitch",
                                                "typical_range": "F: 3.7; E-flat: 4.0; CC: 4.9; BB-flat: 5.5",
                                                "unit": "m"
                                            },
                                            {
                                                "quantity": "Valve count",
                                                "typical_range": "3-6",
                                                "unit": "valves"
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-measurements-q01",
                                                "text": "Which of these typical measurements hold for the sense of tuba 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": [
                                            "Sticking or sluggish valves caused by contamination, inadequate lubrication, wear or misalignment.",
                                            "Air leaks at valves, slides or water-key seals that reduce response and pitch stability.",
                                            "Dents and damaged tubing that can impede airflow or alter acoustic response.",
                                            "Corrosion and deposits associated with retained moisture and inadequate cleaning.",
                                            "Musculoskeletal strain from carrying or supporting a large instrument, especially during marching."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-failure-modes-and-hazards-q01",
                                                "text": "Which of these failure modes and hazards hold for the sense of tuba 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": [
                                            "British brass bands conventionally use E-flat and BB-flat basses, commonly reading transposing treble-clef parts.",
                                            "CC tubas are common in United States orchestral practice; BB-flat tubas have a strong place in German-speaking orchestral traditions.",
                                            "Orchestral tuba parts generally use concert-pitch bass clef, while brass-band and some regional wind-band traditions use transposing notation."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-regional-variation-q01",
                                                "text": "Which of these regional variation hold for the sense of tuba 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": "Euphonium",
                                                "difference": "A related conical-bore valved brass instrument normally serving the tenor register, with shorter tubing than bass and contrabass tubas."
                                            },
                                            {
                                                "name": "Bass trombone",
                                                "difference": "Normally selects chromatic pitches primarily with a slide and has predominantly cylindrical tubing, unlike the tuba's valve-controlled, predominantly conical tubing."
                                            },
                                            {
                                                "name": "Wagner tuba",
                                                "difference": "A distinct horn-related instrument using a horn-type mouthpiece; its name does not make it an ordinary bass or contrabass tuba."
                                            },
                                            {
                                                "name": "Sousaphone",
                                                "difference": "A tuba subtype with tubing wrapped around the player's body and a large forward-facing bell, designed for mobile performance."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-neighbours-q01",
                                                "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of tuba this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "openQuestions": [
                "Does the registry intend 'tuba' to include sousaphones, helicons and historical forms, or are these represented by neighbouring entries?",
                "Which authoritative classification sources resolve the boundaries with euphonium, tenor tuba and Wagner tuba across naming traditions?",
                "Which pitch, bore, mass and bell-dimension ranges can be supported for each included variant without implying a universal specification?",
                "Which manufacturer instructions establish configuration-specific mouthpiece fit, lubrication, cleaning and service limits?",
                "Which instrument-specific standards or certification requirements, if any, apply in the intended jurisdiction and use context?"
            ],
            "statistics": {
                "bundles": 6,
                "layers": 11,
                "findings": 18,
                "questions": 28
            }
        },
        "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 tuba, record what state it is in, and decide what may be done with it.",
            "whatItIs": "Enable an agent to recognise a tuba, assess its musical suitability and physical condition, and determine appropriate playing, handling and maintenance actions.",
            "characteristics": {
                "substance": "material",
                "origin": "manufactured",
                "agency": "inert",
                "mobility": "varies"
            },
            "whatYouCanDoWithIt": [
                "observed and measured"
            ],
            "distinguishingFeatures": [
                "Names folded into this entry, which a task may need to split apart again: valved ophicleide, euphonium, subcontrabass tuba, helicon, double bell euphonium, soprano helicon.",
                "6 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.",
                "Described in 82 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 tuba, 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": [
                {
                    "relation": "covers",
                    "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.",
                    "targets": [
                        "valved ophicleide",
                        "euphonium",
                        "subcontrabass tuba",
                        "helicon",
                        "double bell euphonium",
                        "soprano helicon"
                    ]
                }
            ],
            "standing": "Described in 82 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 6 finer distinctions are held inside this entry as names rather than as separate models.",
            "structure": {
                "bundles": [
                    {
                        "id": "identity-and-classification",
                        "name": "Identity, naming and classification",
                        "description": "How an agent tells one tuba from another, and a tuba 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 tuba, 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 tuba, 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 tuba 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 tuba, 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 tuba, 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 tuba 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 tuba 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 tuba, 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 tuba, 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 tuba 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 tuba from the things most often confused with it.",
                                        "questions": [
                                            {
                                                "id": "distinguishing-features-q01",
                                                "text": "What identifies and describes what distinguishes a tuba, 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 tuba, 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 tuba 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 tuba 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 tuba, 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 tuba, 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 tuba 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 tuba is built from and which parts are replaceable.",
                                        "questions": [
                                            {
                                                "id": "parts-and-materials-q01",
                                                "text": "What identifies and describes the composition of a tuba, 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 tuba, 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 tuba 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 tuba is judged and by whom.",
                                        "questions": [
                                            {
                                                "id": "condition-assessment-q01",
                                                "text": "What identifies and describes the condition of a tuba, 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 tuba, 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 tuba 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 tuba 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 tuba is, and what that position is measured against.",
                                        "questions": [
                                            {
                                                "id": "position-and-frame-q01",
                                                "text": "What identifies and describes the location of a tuba, 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 tuba, 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 tuba 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 tuba 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 tuba, 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 tuba, 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 tuba 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 tuba 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 tuba between them.",
                                        "questions": [
                                            {
                                                "id": "stages-and-transitions-q01",
                                                "text": "What identifies and describes the lifecycle of a tuba, 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 tuba, 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 tuba 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 tuba, how often and by whom.",
                                "findings": [
                                    {
                                        "id": "observation-record",
                                        "name": "Observation record",
                                        "description": "How an observation of a tuba 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 tuba, 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 tuba, 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 tuba 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 tuba 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 tuba 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 tuba, 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 tuba 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 tuba 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 tuba 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 tuba 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 tuba 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 tuba, 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 tuba 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 tuba and how confident it is.",
                                        "questions": [
                                            {
                                                "id": "claim-provenance-q01",
                                                "text": "What identifies and describes a claim about a tuba, 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 tuba, 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 tuba 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 tuba is retired without being erased.",
                                        "questions": [
                                            {
                                                "id": "validity-and-supersession-q01",
                                                "text": "What identifies and describes the validity of a claim about a tuba, 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 tuba, 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 tuba 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
            }
        }
    }
}