{
    "model": {
        "rank": 3701,
        "code": "thing-q165666",
        "model_id": "vr.tr.xylophone",
        "name": "xylophone",
        "purpose": "Enable an agent to recognise a xylophone, assess its musical and physical readiness, and determine suitable playing, setup and care actions.",
        "family": "Thing Registry",
        "category": "Physical world and living systems",
        "status": "research-draft",
        "kind": "thing",
        "plane": "PHY",
        "domain": "PHY.OBJ",
        "industry": "",
        "version": "",
        "url": "/models/thing/q165666/",
        "tier": 2,
        "score": 83,
        "payload": {
            "layer": "wikidata",
            "aliases": [
                "dendrophone",
                "Berom Xylophone",
                "pattala",
                "calung",
                "roneat thung",
                "balafon",
                "djéguélé",
                "Kolintang",
                "kalangba",
                "Garantung",
                "valimba",
                "gyile",
                "straw fiddle",
                "Gambang",
                "Akadinda",
                "mendzan",
                "Gambang kayu",
                "Gambang gangsa"
            ],
            "aliasCount": 18,
            "merged": 18,
            "knownIn": 83,
            "facets": null,
            "markers": [],
            "lexicalClass": "",
            "senseRank": null,
            "alsoRegisteredAs": null,
            "source": {
                "dataset": "wikidata",
                "item": "Q165666",
                "url": "https://www.wikidata.org/wiki/Q165666",
                "license": "CC0 1.0"
            }
        },
        "research": {
            "vercy": "1.0-draft",
            "publication": {
                "status": "research-draft",
                "adjudicationStatus": "unreviewed",
                "publishableCanonical": false,
                "generatedAt": "2026-09-07T14:55:00Z",
                "providers": [
                    "Codex"
                ],
                "breadth": "recalled by Codex without web access - no source was read",
                "missingProviders": [],
                "pass": 2,
                "cost": {
                    "grok": {
                        "seconds": 27.3,
                        "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: 01a07c5c-6be1-7423-ac9f-c79097ccfdf5\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: xylophone\nSense to describe: (none recorded)\nDomain code: PHY.OBJ\nAlso known as: (none)\n\n\nContext for this batch of 1001 things:\n# Batch 004: 1001 regis",
                        "usd": 0,
                        "recall": true
                    },
                    "codex": {
                        "seconds": 73.8,
                        "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: 01a07c5c-6bef-7352-af6b-1d9f7744527a\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: xylophone\nRegistry id: vr.tr.xylophone\nPlane / domain: PHY / PHY.OBJ\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\n\nCont"
                    }
                }
            },
            "metaModel": {
                "id": "THING-Q165666",
                "registryId": "vr.tr.xylophone",
                "name": "xylophone",
                "version": "0.1.0-research.1",
                "entryKind": "thing",
                "family": "Thing Registry",
                "domain": [
                    "PHY.OBJ"
                ],
                "status": "research-draft"
            },
            "canonicalUrl": "https://ver.cy/models/thing/q165666/",
            "model": {
                "registry_id": "vr.tr.xylophone",
                "name": "xylophone",
                "purpose": "Enable an agent to recognise a xylophone, assess its musical and physical readiness, and determine suitable playing, setup and care actions.",
                "definition": "A xylophone is a pitched percussion instrument consisting of tuned wooden bars that sound through their own vibration when struck, usually with mallets, and are arranged for melodic or patterned playing.",
                "scope_statement": "This model owns the xylophone as a kind of pitched percussion instrument whose individually tuned wooden or wood-substitute bars are struck, including its acoustic assembly, playable organisation and condition, while distinguishing the kind from a product model or individual instrument.",
                "in_scope": [
                    "Tuned bars, their materials, pitch organisation and striking surfaces",
                    "Bar suspension, supports, frame and fitted resonators",
                    "Sound production through mallet impact and bar vibration",
                    "Playable range, tuning, register conventions and musical readiness",
                    "Xylophone-specific setup, mallet compatibility and care"
                ],
                "out_of_scope": [
                    "Marimbas, glockenspiels and vibraphones as separately identified instrument kinds",
                    "Mallets as independently catalogued implements",
                    "Compositions, notation systems and performance techniques as independent subjects",
                    "Manufacturer product lines and individual instrument inventory records",
                    "Electronic controllers that imitate a xylophone without an acoustic tuned-bar assembly"
                ],
                "distinguishing_features": [
                    "Produces its acoustic pitches by striking separate tuned bars rather than strings, membranes or air columns.",
                    "Uses wooden or wood-substitute sounding bars; metal-bar instruments require differentiation from glockenspiels, vibraphones and other metallophones.",
                    "Provides an intentional organisation of bar pitches, rather than merely a collection of untuned wooden percussion surfaces.",
                    "Identification against a marimba must consider the named instrument tradition, register, bar design and voicing together; bar material or the presence of resonator tubes alone does not settle the boundary.",
                    "A keyboard-shaped toy or electronic pad is not sufficient evidence: determine whether struck bars themselves produce the intended pitched sound."
                ],
                "characteristics": [
                    {
                        "name": "Instrument tradition and designation",
                        "kind": "category",
                        "unit_or_values": "Local name, cultural or musical tradition, maker designation; unresolved",
                        "why_it_matters": "Determines how to interpret the xylophone label without imposing one orchestral design on every example."
                    },
                    {
                        "name": "Sounding-bar material",
                        "kind": "category",
                        "unit_or_values": "Identified wood species; identified synthetic or composite material; mixed; unknown",
                        "why_it_matters": "Supports identification and informs mallet compatibility, environmental care and replacement decisions."
                    },
                    {
                        "name": "Bar count and pitch map",
                        "kind": "measurement",
                        "unit_or_values": "Number of bars, with position-to-pitch mapping in Hz or a declared pitch-naming system",
                        "why_it_matters": "Reveals playable notes, missing bars and layout errors."
                    },
                    {
                        "name": "Sounding range",
                        "kind": "measurement",
                        "unit_or_values": "Lowest and highest sounding pitches in Hz, optionally paired with note names and octave convention",
                        "why_it_matters": "Allows repertoire and ensemble requirements to be checked without confusing written and sounding pitch."
                    },
                    {
                        "name": "Tuning reference and pitch deviation",
                        "kind": "measurement",
                        "unit_or_values": "Declared reference frequency in Hz, tuning system and per-bar deviation in cents under recorded conditions",
                        "why_it_matters": "Makes tuning judgements meaningful for the intended musical context."
                    },
                    {
                        "name": "Bar layout",
                        "kind": "category",
                        "unit_or_values": "Single row; multiple rows; keyboard-style chromatic layout; other documented arrangement",
                        "why_it_matters": "Determines note access and prevents assuming that every xylophone uses a piano-like arrangement."
                    },
                    {
                        "name": "Resonator configuration",
                        "kind": "category",
                        "unit_or_values": "Absent; individual resonators; shared resonating enclosure; other documented form",
                        "why_it_matters": "Explains sound reinforcement and identifies setup components that may require inspection."
                    },
                    {
                        "name": "Bar and suspension condition",
                        "kind": "state",
                        "unit_or_values": "Intact and freely vibrating; cracked; chipped; displaced; contacting support; suspension worn; unassessed",
                        "why_it_matters": "Distinguishes tuning concerns from mechanical faults and identifies reasons to suspend playing."
                    },
                    {
                        "name": "Compatible mallets",
                        "kind": "relation",
                        "unit_or_values": "Documented compatible mallet head materials, hardness classes and sizes, with source of guidance",
                        "why_it_matters": "Connects the desired articulation to the risk of damaging the bars."
                    },
                    {
                        "name": "Playing height",
                        "kind": "measurement",
                        "unit_or_values": "Height of striking surface in cm; adjustment range where applicable",
                        "why_it_matters": "Supports accessible setup and suitable playing posture."
                    }
                ],
                "affordances": [
                    "Identify the instrument through its sounding bars, pitch organisation and documented tradition.",
                    "Map available sounding pitches to a musical requirement.",
                    "Assess readiness by checking bars, suspension, resonators and frame before playing.",
                    "Select compatible mallets and an appropriate striking approach using instrument-specific guidance.",
                    "Arrange and secure removable bars or resonators according to a verified assembly reference.",
                    "Recommend routine care or specialist assessment from observed mechanical and acoustic symptoms."
                ]
            },
            "sources": [],
            "structure": {
                "bundles": [
                    {
                        "id": "identity-and-musical-boundary",
                        "name": "Identity and musical boundary",
                        "description": "Establishes what counts as a xylophone and which musical tradition gives the designation meaning.",
                        "rationale": "Similar tuned-bar instruments overlap in appearance, so identification requires more than a keyboard-like silhouette.",
                        "layers": [
                            {
                                "id": "sounding-element",
                                "name": "Sounding element",
                                "description": "Identifies the physical source of the pitched sound.",
                                "findings": [
                                    {
                                        "id": "struck-tuned-bars",
                                        "name": "Struck tuned bars",
                                        "description": "Record whether separate wooden or wood-substitute bars generate the intended pitches when struck.",
                                        "questions": [
                                            {
                                                "text": "Do the bars themselves produce organised acoustic pitches when struck?",
                                                "kind": "definition",
                                                "id": "struck-tuned-bars-q01"
                                            },
                                            {
                                                "text": "What evidence identifies the sounding-bar material rather than merely its surface finish?",
                                                "kind": "provenance",
                                                "id": "struck-tuned-bars-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "tradition-and-neighbours",
                                "name": "Tradition and neighbours",
                                "description": "Resolves naming and boundaries with related percussion instruments.",
                                "findings": [
                                    {
                                        "id": "contextual-identification",
                                        "name": "Contextual identification",
                                        "description": "Record the designation used by the relevant maker, collection or musical community and the evidence distinguishing neighbouring instrument kinds.",
                                        "questions": [
                                            {
                                                "text": "Which source or musical community identifies this instrument form as a xylophone?",
                                                "kind": "provenance",
                                                "id": "contextual-identification-q01"
                                            },
                                            {
                                                "text": "What combination of tradition, register, bar construction and voicing distinguishes it from a marimba or metallophone?",
                                                "kind": "boundary",
                                                "id": "contextual-identification-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "pitch-map-and-tuning",
                        "name": "Pitch map and tuning",
                        "description": "Describes the available pitches, their physical arrangement and the reference used to judge tuning.",
                        "rationale": "An agent must establish which notes can be played and how pitch accuracy is defined for this instrument.",
                        "layers": [
                            {
                                "id": "range-and-layout",
                                "name": "Range and layout",
                                "description": "Connects each bar position to its intended sounding pitch.",
                                "findings": [
                                    {
                                        "id": "available-note-map",
                                        "name": "Available note map",
                                        "description": "Record bar count, physical sequence, sounding range and any deliberate omissions or duplicated pitches.",
                                        "questions": [
                                            {
                                                "text": "How many bars are present, and which sounding pitch belongs to each position?",
                                                "kind": "measurement",
                                                "id": "available-note-map-q01"
                                            },
                                            {
                                                "text": "Are apparent pitch gaps intentional features of the tuning or evidence of missing or misplaced bars?",
                                                "kind": "boundary",
                                                "id": "available-note-map-q02"
                                            },
                                            {
                                                "text": "Does the stated range describe sounding pitches or written pitches, and which octave-naming convention is used?",
                                                "kind": "definition",
                                                "id": "available-note-map-q03"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "tuning-assessment",
                                "name": "Tuning assessment",
                                "description": "Defines the musical and measurement context for evaluating bar pitches.",
                                "findings": [
                                    {
                                        "id": "reference-and-deviation",
                                        "name": "Reference and deviation",
                                        "description": "Record the intended tuning system, reference frequency and measured deviations without presuming equal temperament.",
                                        "questions": [
                                            {
                                                "text": "What tuning system and reference pitch are intended, and who establishes them?",
                                                "kind": "provenance",
                                                "id": "reference-and-deviation-q01"
                                            },
                                            {
                                                "text": "What is each bar's measured pitch deviation under recorded environmental and test conditions?",
                                                "kind": "measurement",
                                                "id": "reference-and-deviation-q02"
                                            },
                                            {
                                                "text": "What documented tolerance or musical assessment determines whether retuning is needed?",
                                                "kind": "action",
                                                "id": "reference-and-deviation-q03"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "acoustic-assembly-and-response",
                        "name": "Acoustic assembly and response",
                        "description": "Relates the bars, supports and resonating components to the instrument's audible response.",
                        "rationale": "Weak notes, rattles and shortened sustain can arise from assembly faults rather than incorrect pitch tuning.",
                        "layers": [
                            {
                                "id": "bar-support-and-clearance",
                                "name": "Bar support and clearance",
                                "description": "Examines how bars are held while remaining able to vibrate.",
                                "findings": [
                                    {
                                        "id": "free-bar-vibration",
                                        "name": "Free bar vibration",
                                        "description": "Record suspension or support construction, bar seating and unintended contact with adjacent components.",
                                        "questions": [
                                            {
                                                "text": "How is each bar supported, and what verified arrangement establishes its correct seating?",
                                                "kind": "definition",
                                                "id": "free-bar-vibration-q01"
                                            },
                                            {
                                                "text": "Which bars touch neighbouring bars, frame parts or displaced suspension components during a controlled strike?",
                                                "kind": "measurement",
                                                "id": "free-bar-vibration-q02"
                                            },
                                            {
                                                "text": "Which seating or suspension corrections are permitted without altering the bars?",
                                                "kind": "action",
                                                "id": "free-bar-vibration-q03"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "resonance-and-articulation",
                                "name": "Resonance and articulation",
                                "description": "Assesses resonating components and the resulting attack, decay and unwanted noise.",
                                "findings": [
                                    {
                                        "id": "resonator-fit-and-response",
                                        "name": "Resonator fit and response",
                                        "description": "Record whether resonators are part of the design, how they align, and whether acoustic anomalies persist under consistent striking conditions.",
                                        "questions": [
                                            {
                                                "text": "Does this design use resonators, and how is their correct placement established?",
                                                "kind": "provenance",
                                                "id": "resonator-fit-and-response-q01"
                                            },
                                            {
                                                "text": "Under a consistent mallet and strike method, which notes exhibit rattling, buzzing or unexpectedly weak response?",
                                                "kind": "measurement",
                                                "id": "resonator-fit-and-response-q02"
                                            },
                                            {
                                                "text": "Is an unusual decay characteristic of the design or evidence of an assembly or condition problem?",
                                                "kind": "boundary",
                                                "id": "resonator-fit-and-response-q03"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "playing-readiness-and-care",
                        "name": "Playing readiness and care",
                        "description": "Determines appropriate mallets, playable setup and interventions that preserve the tuned-bar assembly.",
                        "rationale": "Readiness depends on both musical suitability and avoiding damage to bars, supports and fitted resonators.",
                        "layers": [
                            {
                                "id": "mallets-and-playing-setup",
                                "name": "Mallets and playing setup",
                                "description": "Connects striking implements and physical setup to the intended use.",
                                "findings": [
                                    {
                                        "id": "compatible-striking-and-access",
                                        "name": "Compatible striking and access",
                                        "description": "Record supported mallet choices, access to the bar layout and stability at the chosen playing height.",
                                        "questions": [
                                            {
                                                "text": "Which mallet materials and hardnesses are supported by guidance for these bars?",
                                                "kind": "provenance",
                                                "id": "compatible-striking-and-access-q01"
                                            },
                                            {
                                                "text": "Can the intended player reach the required bars at a suitable height without destabilising the instrument?",
                                                "kind": "action",
                                                "id": "compatible-striking-and-access-q02"
                                            },
                                            {
                                                "text": "If the frame has adjustable joints or casters, what must be secured before playing?",
                                                "kind": "action",
                                                "id": "compatible-striking-and-access-q03"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "condition-and-intervention",
                                "name": "Condition and intervention",
                                "description": "Separates routine care from repairs that can change pitch or damage the assembly.",
                                "findings": [
                                    {
                                        "id": "preserve-tuned-components",
                                        "name": "Preserve tuned components",
                                        "description": "Record bar damage, suspension wear and care requirements, with an explicit boundary around specialist tuning and repair.",
                                        "questions": [
                                            {
                                                "text": "Which bars or supports show cracks, chips, wear or displacement that affect safe handling or musical response?",
                                                "kind": "measurement",
                                                "id": "preserve-tuned-components-q01"
                                            },
                                            {
                                                "text": "What cleaning, storage and transport guidance applies to the identified bar material and construction?",
                                                "kind": "provenance",
                                                "id": "preserve-tuned-components-q02"
                                            },
                                            {
                                                "text": "Which symptoms require stopping use or specialist assessment before material removal, refinishing or bar replacement?",
                                                "kind": "action",
                                                "id": "preserve-tuned-components-q03"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "evidence-and-external-alignment",
                        "name": "Evidence and external alignment",
                        "description": "What the world already says about this thing, gathered so the model can be checked against it.",
                        "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.",
                        "layers": [
                            {
                                "id": "reported-evidence",
                                "name": "Reported evidence",
                                "description": "Findings from the breadth pass, kept separate from the structural claims.",
                                "findings": [
                                    {
                                        "id": "evidence-confidence-notes",
                                        "name": "Check these first",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "This describes the instrument family, with measurement ranges specific to common Western concert practice rather than every regional form.",
                                            "Some instruments sold as xylophones use synthetic bars; wooden bars define the traditional construction.",
                                            "Local instrument names, tuning systems and the boundary between xylophone and marimba need specialist verification; no sources were consulted for this recall."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-confidence-notes-q01",
                                                "text": "Which of these check these first hold for the sense of xylophone 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": [
                                            "Orchestral xylophone",
                                            "Classroom xylophone",
                                            "Trough-resonated xylophone",
                                            "Gourd-resonated xylophone",
                                            "Log-supported xylophone"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-kinds-q01",
                                                "text": "Which of these kinds and varieties hold for the sense of xylophone 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": "Hornbostel-Sachs musical instrument classification",
                                                "value_or_pattern": "111.212",
                                                "note": "Sets of percussion sticks; this category includes xylophones and is not a unique identifier for the instrument."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-identifiers-q01",
                                                "text": "Which of these identifiers and schemes hold for the sense of xylophone 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": [
                                            "Orchestral and concert-band percussion parts",
                                            "Solo and chamber music performance",
                                            "Classroom music education and ensemble playing",
                                            "Dance accompaniment and ceremonial music in regional traditions"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-real-world-use-q01",
                                                "text": "Which of these real-world use hold for the sense of xylophone 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": "Pitch compass of a full-size orchestral instrument",
                                                "typical_range": "3.5-4",
                                                "unit": "octaves"
                                            },
                                            {
                                                "quantity": "Common concert reference pitch for A4",
                                                "typical_range": "440-442",
                                                "unit": "Hz"
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-measurements-q01",
                                                "text": "Which of these typical measurements hold for the sense of xylophone 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": [
                                            "Wooden bars can crack, warp or change tuning with humidity and temperature changes.",
                                            "Unsuitable hard mallets or excessive striking force can chip or damage bars.",
                                            "Worn suspension cords or displaced supports can cause rattling, uneven response or excessive damping.",
                                            "Loose resonators and frame fittings can introduce unwanted vibration and noise.",
                                            "Unsecured wheeled frames can roll or tip during movement or performance."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-failure-modes-and-hazards-q01",
                                                "text": "Which of these failure modes and hazards hold for the sense of xylophone 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": [
                                            "Western orchestral instruments commonly use chromatic bars in two rows, individual tubular resonators and notation an octave below sounding pitch.",
                                            "African xylophone traditions include instruments with gourd resonators, sometimes fitted with membranes that add a buzzing timbre, and locally specific tuning systems.",
                                            "Southeast Asian traditions include trough-resonated instruments with suspended bars, such as the Thai ranat ek, whose tuning and playing practice differ from Western orchestral conventions."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-regional-variation-q01",
                                                "text": "Which of these regional variation hold for the sense of xylophone 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": "marimba",
                                                "difference": "Both use tuned bars, traditionally wooden; the modern concert marimba generally has a lower compass and different bar shaping and overtone tuning. Traditional naming boundaries can overlap."
                                            },
                                            {
                                                "name": "glockenspiel",
                                                "difference": "Its sounding bars are metal rather than wood."
                                            },
                                            {
                                                "name": "vibraphone",
                                                "difference": "It uses metal bars, typically with a pedal-operated damper and rotating mechanisms in the resonators that modulate the sound."
                                            },
                                            {
                                                "name": "lithophone",
                                                "difference": "Its sounding elements are stone rather than wood."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-neighbours-q01",
                                                "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of xylophone this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "openQuestions": [
                "Which organological references should define the registry boundary between xylophone and marimba across different musical traditions?",
                "Which wood-substitute bar materials are accepted within this entry, and what evidence distinguishes them from neighbouring instrument categories?",
                "What tuning tolerances, measurement procedures and environmental conditions are appropriate for each supported xylophone tradition or construction?",
                "Which authoritative sources establish mallet compatibility, care limits and repair criteria for different bar materials?",
                "Which standards, if any, apply to particular uses such as children's toys or school instruments, and how should those requirements be kept conditional on use?"
            ],
            "statistics": {
                "bundles": 5,
                "layers": 9,
                "findings": 16,
                "questions": 30
            }
        },
        "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 xylophone, record what state it is in, and decide what may be done with it.",
            "whatItIs": "Enable an agent to recognise a xylophone, assess its musical and physical readiness, and determine suitable playing, setup and care 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: dendrophone, Berom Xylophone, pattala, calung, roneat thung, balafon, djéguélé, Kolintang, kalangba, Garantung, valimba, gyile.",
                "18 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.",
                "Described in 83 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 xylophone, 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": [
                        "dendrophone",
                        "Berom Xylophone",
                        "pattala",
                        "calung",
                        "roneat thung",
                        "balafon",
                        "djéguélé",
                        "Kolintang",
                        "kalangba",
                        "Garantung",
                        "valimba",
                        "gyile"
                    ]
                }
            ],
            "standing": "Described in 83 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 18 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 xylophone from another, and a xylophone 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 xylophone, 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 xylophone, 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 xylophone 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 xylophone, 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 xylophone, 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 xylophone 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 xylophone 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 xylophone, 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 xylophone, 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 xylophone 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 xylophone from the things most often confused with it.",
                                        "questions": [
                                            {
                                                "id": "distinguishing-features-q01",
                                                "text": "What identifies and describes what distinguishes a xylophone, 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 xylophone, 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 xylophone 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 xylophone 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 xylophone, 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 xylophone, 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 xylophone 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 xylophone is built from and which parts are replaceable.",
                                        "questions": [
                                            {
                                                "id": "parts-and-materials-q01",
                                                "text": "What identifies and describes the composition of a xylophone, 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 xylophone, 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 xylophone 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 xylophone is judged and by whom.",
                                        "questions": [
                                            {
                                                "id": "condition-assessment-q01",
                                                "text": "What identifies and describes the condition of a xylophone, 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 xylophone, 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 xylophone 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 xylophone 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 xylophone is, and what that position is measured against.",
                                        "questions": [
                                            {
                                                "id": "position-and-frame-q01",
                                                "text": "What identifies and describes the location of a xylophone, 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 xylophone, 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 xylophone 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 xylophone 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 xylophone, 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 xylophone, 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 xylophone 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 xylophone 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 xylophone between them.",
                                        "questions": [
                                            {
                                                "id": "stages-and-transitions-q01",
                                                "text": "What identifies and describes the lifecycle of a xylophone, 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 xylophone, 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 xylophone 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 xylophone, how often and by whom.",
                                "findings": [
                                    {
                                        "id": "observation-record",
                                        "name": "Observation record",
                                        "description": "How an observation of a xylophone 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 xylophone, 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 xylophone, 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 xylophone 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 xylophone 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 xylophone 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 xylophone, 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 xylophone 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 xylophone 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 xylophone 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 xylophone 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 xylophone 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 xylophone, 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 xylophone 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 xylophone and how confident it is.",
                                        "questions": [
                                            {
                                                "id": "claim-provenance-q01",
                                                "text": "What identifies and describes a claim about a xylophone, 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 xylophone, 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 xylophone 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 xylophone is retired without being erased.",
                                        "questions": [
                                            {
                                                "id": "validity-and-supersession-q01",
                                                "text": "What identifies and describes the validity of a claim about a xylophone, 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 xylophone, 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 xylophone 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
            }
        }
    }
}