{
    "model": {
        "rank": 4181,
        "code": "thing-q152095",
        "model_id": "vr.tr.bathtub",
        "name": "bathtub",
        "purpose": "Enable an agent to recognise a bathtub, assess its suitability and condition for bathing, and determine what use, installation or maintenance actions its recorded constraints permit.",
        "family": "Thing Registry",
        "category": "Physical world and living systems",
        "status": "research-draft",
        "kind": "thing",
        "plane": "PHY",
        "domain": "PHY.OBJ",
        "industry": "",
        "version": "",
        "url": "/models/thing/q152095/",
        "tier": 2,
        "score": 77,
        "payload": {
            "layer": "wikidata",
            "aliases": [
                "plunge dip",
                "bird bath",
                "bird cage bird bath",
                "Inflatable bathtub",
                "clawfoot bathtub",
                "hot tub",
                "foot bath"
            ],
            "aliasCount": 7,
            "merged": 7,
            "knownIn": 77,
            "facets": null,
            "markers": [],
            "lexicalClass": "",
            "senseRank": null,
            "alsoRegisteredAs": null,
            "source": {
                "dataset": "wikidata",
                "item": "Q152095",
                "url": "https://www.wikidata.org/wiki/Q152095",
                "license": "CC0 1.0"
            }
        },
        "research": {
            "vercy": "1.0-draft",
            "publication": {
                "status": "research-draft",
                "adjudicationStatus": "unreviewed",
                "publishableCanonical": false,
                "generatedAt": "2026-09-09T19:39:20Z",
                "providers": [
                    "Codex"
                ],
                "breadth": "recalled by Codex without web access - no source was read",
                "missingProviders": [],
                "pass": 2,
                "cost": {
                    "grok": {
                        "seconds": 22.9,
                        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\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: 01a087ad-8c67-7e33-b1b2-c634e7c0f9f0\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: bathtub\nSense to describe: (none recorded)\nDomain code: PHY.OBJ\nAlso known as: (none)\n\n\nContext for this batch of 695 things:\n# Batch 004: 1001 register",
                        "usd": 0,
                        "recall": true
                    },
                    "codex": {
                        "seconds": 67.4,
                        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\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: 01a087ad-8c5b-7402-8e52-cbdb08abfe99\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: bathtub\nRegistry id: vr.tr.bathtub\nPlane / domain: PHY / PHY.OBJ\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\n\nContext "
                    }
                }
            },
            "metaModel": {
                "id": "THING-Q152095",
                "registryId": "vr.tr.bathtub",
                "name": "bathtub",
                "version": "0.1.0-research.1",
                "entryKind": "thing",
                "family": "Thing Registry",
                "domain": [
                    "PHY.OBJ"
                ],
                "status": "research-draft"
            },
            "canonicalUrl": "https://ver.cy/models/thing/q152095/",
            "model": {
                "registry_id": "vr.tr.bathtub",
                "name": "bathtub",
                "purpose": "Enable an agent to recognise a bathtub, assess its suitability and condition for bathing, and determine what use, installation or maintenance actions its recorded constraints permit.",
                "definition": "A bathtub is a watertight sanitary fixture sized to accommodate a person for bathing by partial or substantial immersion in water, ordinarily equipped with a drain and supplied with hot and cold water.",
                "scope_statement": "This model covers bathtub as the PHY.OBJ kind registered as vr.tr.bathtub: a vessel designed to hold water for bathing a person's body, including its basin, integral fittings and interfaces with supporting structures and water services.",
                "in_scope": [
                    "Basin geometry, bathing capacity and intended occupant arrangement",
                    "Shell materials, finishes and water-retaining condition",
                    "Support, mounting and connections to filling and drainage systems",
                    "Entry, exit and bathing controls supplied as part of the bathtub",
                    "Optional integral circulation, heating or air-jet equipment",
                    "Cleaning, inspection and repair constraints specific to the bathtub"
                ],
                "out_of_scope": [
                    "The bathing activity and personal care plans",
                    "Whole-building plumbing, hot-water production and electrical distribution",
                    "Bathroom layout, ventilation and room waterproofing beyond the bathtub interfaces",
                    "Standalone showers, washbasins, swimming pools and recreational spas",
                    "Separate bath lifts, grab rails and other assistive equipment",
                    "Product-line commercial records and ownership histories of individual units"
                ],
                "distinguishing_features": [
                    "The basin is intended to retain a body-bathing volume of water during use, unlike a shower tray intended primarily to collect and discharge flowing water.",
                    "Its occupant space is designed for a person's body to sit or recline in bathing water, rather than primarily for washing hands or objects as in a washbasin or utility sink.",
                    "Body immersion and bathing are defining uses; jets alone do not establish whether a vessel belongs here or under a recreational spa model.",
                    "A shower mounted above the basin adds a showering function without removing the basin's bathtub identity.",
                    "A watertight entry door, when present, changes access and filling constraints but does not make the vessel a different registered kind."
                ],
                "characteristics": [
                    {
                        "name": "Bathing configuration",
                        "kind": "category",
                        "unit_or_values": "reclining; seated; other documented arrangement; intended occupant count",
                        "why_it_matters": "Identifies how the basin accommodates bodies and prevents assumptions about posture or shared use."
                    },
                    {
                        "name": "Installation configuration",
                        "kind": "category",
                        "unit_or_values": "alcove; freestanding; drop-in; undermount; other documented configuration",
                        "why_it_matters": "Determines support, enclosure and service-access interfaces."
                    },
                    {
                        "name": "Basin geometry",
                        "kind": "measurement",
                        "unit_or_values": "internal length, width, depth and entry height in mm, with measurement reference points",
                        "why_it_matters": "Supports assessment of occupant fit, access and usable bathing space."
                    },
                    {
                        "name": "Water capacity",
                        "kind": "measurement",
                        "unit_or_values": "L, distinguishing empty-basin capacity from intended operating fill and stating the fill reference",
                        "why_it_matters": "Occupant displacement and fill level affect water demand, freeboard and overflow risk."
                    },
                    {
                        "name": "Shell and finish",
                        "kind": "category",
                        "unit_or_values": "documented substrate, reinforcement and exposed finish",
                        "why_it_matters": "Controls cleaning compatibility, damage interpretation and repair options."
                    },
                    {
                        "name": "Installed load",
                        "kind": "measurement",
                        "unit_or_values": "kg for dry mass, water mass and assumed occupant mass; support reactions in N where documented",
                        "why_it_matters": "Makes the assumptions behind support suitability explicit."
                    },
                    {
                        "name": "Water-service interfaces",
                        "kind": "relation",
                        "unit_or_values": "connections to filler, waste, stopper and overflow where fitted, with dimensions in mm",
                        "why_it_matters": "Distinguishes integral components from connected services and establishes connection compatibility."
                    },
                    {
                        "name": "Access provisions",
                        "kind": "category",
                        "unit_or_values": "step-over rim; sealed entry door; integral seat; integral handholds; other documented provisions",
                        "why_it_matters": "Supports assessment of entry and exit without treating any single feature as proof of accessibility."
                    },
                    {
                        "name": "Functional condition",
                        "kind": "state",
                        "unit_or_values": "separate observations for shell integrity, leakage, drainage, stability and fitted controls: verified functional; degraded; failed; unassessed",
                        "why_it_matters": "Prevents one successful check from implying that the entire bathtub is fit for use."
                    },
                    {
                        "name": "Powered bathing equipment",
                        "kind": "relation",
                        "unit_or_values": "none; linked pump, blower, heater or control assembly with documented supply and operating limits",
                        "why_it_matters": "Separates a passive vessel from variants requiring additional operating and servicing constraints."
                    }
                ],
                "affordances": [
                    "Assess whether the basin geometry and documented limits suit a proposed bathing arrangement.",
                    "Determine whether filling, retaining water and draining are supported by the current condition of the fittings.",
                    "Evaluate entry and exit options against the user's needs and the installed surroundings.",
                    "Check proposed supports and service connections against documented installation requirements.",
                    "Select compatible cleaning or repair procedures from material and equipment documentation.",
                    "Identify defects or missing evidence that require inspection before a proposed use or modification."
                ]
            },
            "sources": [],
            "structure": {
                "bundles": [
                    {
                        "id": "bathing-vessel-identity",
                        "name": "Bathing vessel identity",
                        "description": "Establishes the bathtub boundary and the body-bathing arrangement the vessel supports.",
                        "rationale": "A bathtub must be distinguished from adjacent sanitary vessels and from the optional equipment attached to it.",
                        "layers": [
                            {
                                "id": "vessel-boundary",
                                "name": "Vessel boundary",
                                "description": "Identifies the defining use and included components.",
                                "findings": [
                                    {
                                        "id": "retained-water-body-bathing",
                                        "name": "Retained-water body bathing",
                                        "description": "Record evidence that the basin is intended to retain water for bathing a person's body, and delimit combination installations.",
                                        "questions": [
                                            {
                                                "text": "What documented intended use establishes this vessel as a bathtub?",
                                                "kind": "definition",
                                                "id": "retained-water-body-bathing-q01"
                                            },
                                            {
                                                "text": "Which shower, spa or assistive components belong to neighbouring models rather than this bathtub?",
                                                "kind": "boundary",
                                                "id": "retained-water-body-bathing-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "occupant-space",
                                "name": "Occupant space",
                                "description": "Describes the bathing posture and usable interior.",
                                "findings": [
                                    {
                                        "id": "body-fit-and-displacement",
                                        "name": "Body fit and displacement",
                                        "description": "Record internal contours, intended occupancy and capacity measurements with their fill assumptions.",
                                        "questions": [
                                            {
                                                "text": "What internal dimensions, seat contours and backrest geometry define the usable bathing space?",
                                                "kind": "measurement",
                                                "id": "body-fit-and-displacement-q01"
                                            },
                                            {
                                                "text": "What water capacity is documented, at which fill level, and does it allow for occupant displacement?",
                                                "kind": "measurement",
                                                "id": "body-fit-and-displacement-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "shell-and-installation",
                        "name": "Shell and installation",
                        "description": "Connects the water-retaining shell to its structural supports and installation interfaces.",
                        "rationale": "The bathtub must retain water while transferring the combined vessel, water and occupant load through an appropriate support arrangement.",
                        "layers": [
                            {
                                "id": "shell-construction",
                                "name": "Shell construction",
                                "description": "Captures the substrate, surface and structural condition of the basin.",
                                "findings": [
                                    {
                                        "id": "water-retaining-envelope",
                                        "name": "Water-retaining envelope",
                                        "description": "Distinguish finish damage from defects affecting the basin's ability to retain water or carry loads.",
                                        "questions": [
                                            {
                                                "text": "Which documentation identifies the shell material, reinforcement and surface finish?",
                                                "kind": "provenance",
                                                "id": "water-retaining-envelope-q01"
                                            },
                                            {
                                                "text": "What inspection evidence distinguishes cosmetic marks from cracks, corrosion, delamination or leakage?",
                                                "kind": "measurement",
                                                "id": "water-retaining-envelope-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "mounting-and-load-transfer",
                                "name": "Mounting and load transfer",
                                "description": "Defines support requirements and interfaces with floors, surrounds and enclosures.",
                                "findings": [
                                    {
                                        "id": "supported-filled-basin",
                                        "name": "Supported filled basin",
                                        "description": "Record required bearing points, fixing arrangements and installation loads without assuming the rim can carry weight.",
                                        "questions": [
                                            {
                                                "text": "Where must the bathtub bear or be fixed, and what installation instructions establish those requirements?",
                                                "kind": "provenance",
                                                "id": "supported-filled-basin-q01"
                                            },
                                            {
                                                "text": "What filled and occupied load must the supports accommodate, with which water and occupant assumptions?",
                                                "kind": "measurement",
                                                "id": "supported-filled-basin-q02"
                                            },
                                            {
                                                "text": "Which joints to walls or surrounds require sealing, and which components require continued service access?",
                                                "kind": "boundary",
                                                "id": "supported-filled-basin-q03"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "water-retention-and-drainage",
                        "name": "Water retention and drainage",
                        "description": "Models the bathtub's filling, retained-water and discharge behaviour.",
                        "rationale": "Bathing depends on a controlled transition between empty, filled and drained states through fittings whose presence and performance must be established.",
                        "layers": [
                            {
                                "id": "filling-and-fill-limits",
                                "name": "Filling and fill limits",
                                "description": "Records water delivery interfaces and the basis of permitted fill levels.",
                                "findings": [
                                    {
                                        "id": "controlled-bath-fill",
                                        "name": "Controlled bath fill",
                                        "description": "Identify how water enters the basin and how users establish an appropriate level and temperature.",
                                        "questions": [
                                            {
                                                "text": "Is the filler integral, rim-mounted or independently supplied, and which controls govern its flow and temperature?",
                                                "kind": "boundary",
                                                "id": "controlled-bath-fill-q01"
                                            },
                                            {
                                                "text": "What fill limit and water-temperature checks apply to the proposed bathing use, and where are they documented?",
                                                "kind": "action",
                                                "id": "controlled-bath-fill-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "waste-and-overflow",
                                "name": "Waste and overflow",
                                "description": "Captures deliberate drainage and any overflow path.",
                                "findings": [
                                    {
                                        "id": "retention-and-discharge-paths",
                                        "name": "Retention and discharge paths",
                                        "description": "Record the stopper, waste connection and any overflow separately; do not presume overflow protection is present or sufficient.",
                                        "questions": [
                                            {
                                                "text": "Which fittings retain and discharge water, and is an overflow fitted and connected?",
                                                "kind": "definition",
                                                "id": "retention-and-discharge-paths-q01"
                                            },
                                            {
                                                "text": "What observed drain time, stopper leakage and overflow performance establish current function under stated test conditions?",
                                                "kind": "measurement",
                                                "id": "retention-and-discharge-paths-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "entry-and-bathing-controls",
                        "name": "Entry and bathing controls",
                        "description": "Captures access constraints and optional equipment that changes bathing operation.",
                        "rationale": "Rim crossing, door seals and powered features create distinct operating conditions that basin dimensions alone cannot describe.",
                        "layers": [
                            {
                                "id": "entry-and-exit",
                                "name": "Entry and exit",
                                "description": "Describes movement across the bathtub boundary and support available within it.",
                                "findings": [
                                    {
                                        "id": "bather-transfer-path",
                                        "name": "Bather transfer path",
                                        "description": "Record step-over geometry, integral supports and any door-dependent filling or exit sequence.",
                                        "questions": [
                                            {
                                                "text": "What entry height, opening width, seat height and integral handhold locations constrain transfer into and out of the basin?",
                                                "kind": "measurement",
                                                "id": "bather-transfer-path-q01"
                                            },
                                            {
                                                "text": "For a door-equipped bathtub, what seal checks and fill or drain sequence are required before opening or closing the door?",
                                                "kind": "action",
                                                "id": "bather-transfer-path-q02"
                                            },
                                            {
                                                "text": "Which user-specific access needs depend on external rails, lifts or bathroom clearance?",
                                                "kind": "boundary",
                                                "id": "bather-transfer-path-q03"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "powered-bathing-functions",
                                "name": "Powered bathing functions",
                                "description": "Handles optional jets, air systems and heaters as explicit variants.",
                                "findings": [
                                    {
                                        "id": "equipped-bath-operating-envelope",
                                        "name": "Equipped bath operating envelope",
                                        "description": "Record powered assemblies, their operating limits and documented protective controls only when fitted.",
                                        "questions": [
                                            {
                                                "text": "Which pumps, blowers or heaters are fitted, and what documentation establishes their supply requirements and minimum operating water level?",
                                                "kind": "provenance",
                                                "id": "equipped-bath-operating-envelope-q01"
                                            },
                                            {
                                                "text": "Which suction protections, interlocks and isolation procedures must be checked before operating or servicing the fitted equipment?",
                                                "kind": "action",
                                                "id": "equipped-bath-operating-envelope-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "care-and-fitness-for-use",
                        "name": "Care and fitness for use",
                        "description": "Relates cleaning and defect evidence to decisions about continued bathtub use.",
                        "rationale": "Surface compatibility, inaccessible water paths and defects at seals or supports require bathtub-specific maintenance and evidence.",
                        "layers": [
                            {
                                "id": "cleaning-and-water-path-hygiene",
                                "name": "Cleaning and water-path hygiene",
                                "description": "Separates basin-surface care from cleaning internal circulation components.",
                                "findings": [
                                    {
                                        "id": "compatible-bath-cleaning",
                                        "name": "Compatible bath cleaning",
                                        "description": "Record approved cleaning methods for the finish, seals and any internal jet circuits.",
                                        "questions": [
                                            {
                                                "text": "Which cleaning agents, abrasives and temperatures are permitted for the documented finish and seals?",
                                                "kind": "action",
                                                "id": "compatible-bath-cleaning-q01"
                                            },
                                            {
                                                "text": "Where fitted, how must circulation pipes, jets and residual-water pockets be flushed, cleaned or drained?",
                                                "kind": "action",
                                                "id": "compatible-bath-cleaning-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "defects-and-conformance-evidence",
                                "name": "Defects and conformance evidence",
                                "description": "Connects observed defects and applicable product requirements to use and repair decisions.",
                                "findings": [
                                    {
                                        "id": "evidence-for-continued-use",
                                        "name": "Evidence for continued use",
                                        "description": "Keep condition observations, repair criteria and product conformance evidence distinct, with unresolved checks visible.",
                                        "questions": [
                                            {
                                                "text": "Which observed shell, support, seal, drainage or equipment defects require restricted use, repair or replacement under the relevant instructions?",
                                                "kind": "action",
                                                "id": "evidence-for-continued-use-q01"
                                            },
                                            {
                                                "text": "Which standards, issuing bodies, editions and certification records apply to this bathtub variant in its intended jurisdiction?",
                                                "kind": "provenance",
                                                "id": "evidence-for-continued-use-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "evidence-and-external-alignment",
                        "name": "Evidence and external alignment",
                        "description": "What the world already says about this thing, gathered so the model can be checked against it.",
                        "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.",
                        "layers": [
                            {
                                "id": "reported-evidence",
                                "name": "Reported evidence",
                                "description": "Findings from the breadth pass, kept separate from the structural claims.",
                                "findings": [
                                    {
                                        "id": "evidence-confidence-notes",
                                        "name": "Check these first",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "This describes the generic sanitary fixture, not a particular product model or installed unit.",
                                            "Dimensions and water volumes are approximate examples for conventional adult tubs, not universal limits or compliance requirements.",
                                            "Standard titles and scope are recalled; researchers should verify current editions, local adoption and applicability to the bathtub material and equipment."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-confidence-notes-q01",
                                                "text": "Which of these check these first hold for the sense of bathtub 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": [
                                            "Alcove bathtub",
                                            "Freestanding bathtub",
                                            "Drop-in bathtub",
                                            "Recessed soaking bathtub",
                                            "Walk-in bathtub",
                                            "Whirlpool bathtub"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-kinds-q01",
                                                "text": "Which of these kinds and varieties hold for the sense of bathtub this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-standards-and-regulation",
                                        "name": "Standards and regulation",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "EN 14516, issued by CEN, specifies functional requirements and test methods for baths for domestic purposes.",
                                            "ASME A112.19.1/CSA B45.2, issued jointly by ASME and CSA Group, covers enameled cast iron and enameled steel plumbing fixtures, including bathtubs."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-standards-and-regulation-q01",
                                                "text": "Which of these standards and regulation hold for the sense of bathtub 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": [
                                            "Personal washing and soaking in homes and accommodation facilities.",
                                            "Bathing children with adult supervision.",
                                            "Assisted bathing using accessible designs and transfer equipment.",
                                            "Combined bathing and showering where a shower fitting and suitable enclosure are installed.",
                                            "Water massage in models fitted with powered circulation jets."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-real-world-use-q01",
                                                "text": "Which of these real-world use hold for the sense of bathtub 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": "Overall length of a conventional adult bathtub",
                                                "typical_range": "1500-1800",
                                                "unit": "mm"
                                            },
                                            {
                                                "quantity": "Overall width of a conventional adult bathtub",
                                                "typical_range": "700-850",
                                                "unit": "mm"
                                            },
                                            {
                                                "quantity": "Water used for one bath",
                                                "typical_range": "80-200, depending on basin geometry, fill depth and occupant displacement",
                                                "unit": "L"
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-measurements-q01",
                                                "text": "Which of these typical measurements hold for the sense of bathtub 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": [
                                            "Slips and falls during entry, exit or movement on wet surfaces.",
                                            "Drowning, particularly involving unsupervised children or people unable to lift themselves from the water.",
                                            "Scalding from excessively hot supply water.",
                                            "Leaks at drains, seals, fittings or cracks, causing concealed water damage.",
                                            "Microbial growth in inadequately cleaned whirlpool circulation systems."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-failure-modes-and-hazards-q01",
                                                "text": "Which of these failure modes and hazards hold for the sense of bathtub 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": [
                                            "North American alcove installations commonly use nominal 60-inch-long tubs; many European products use nominal metric lengths such as 1700 mm.",
                                            "Japanese domestic bathing commonly separates washing outside the tub from soaking in a relatively deep tub.",
                                            "Plumbing, accessibility and electrical installation requirements vary by jurisdiction and by whether the bathtub includes powered equipment."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-regional-variation-q01",
                                                "text": "Which of these regional variation hold for the sense of bathtub 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": "Shower",
                                                "difference": "A shower washes the body with flowing spray; a bathtub retains a volume of water for immersion, although one installation can provide both."
                                            },
                                            {
                                                "name": "Hot tub",
                                                "difference": "A hot tub generally maintains heated, treated water across multiple sessions and may accommodate several people; a conventional bathtub is filled and drained for each bath."
                                            },
                                            {
                                                "name": "Washbasin",
                                                "difference": "A washbasin supports localized washing and is not ordinarily sized to accommodate an adult body for immersion."
                                            },
                                            {
                                                "name": "Whirlpool bathtub",
                                                "difference": "A whirlpool bathtub is a subtype that adds powered water circulation and massage jets to the water-retaining bathing fixture."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-neighbours-q01",
                                                "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of bathtub this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "openQuestions": [
                "Does registry scope include portable infant baths and clinical bathing vessels, or should these link to narrower registered kinds?",
                "Which standards and certification schemes apply across ordinary, door-equipped and powered bathtubs in each intended jurisdiction?",
                "Which capacity and dimension measurement conventions permit reliable comparison between bathtub designs?",
                "What evidence supports slip-resistance and accessibility claims under wet bathing conditions for different finishes and access arrangements?",
                "Which material-specific defects are repairable, and what verification is required before returning repaired shells, seals or circulation systems to use?"
            ],
            "statistics": {
                "bundles": 6,
                "layers": 11,
                "findings": 18,
                "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 bathtub, record what state it is in, and decide what may be done with it.",
            "whatItIs": "Enable an agent to recognise a bathtub, assess its suitability and condition for bathing, and determine what use, installation or maintenance actions its recorded constraints permit.",
            "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: plunge dip, bird bath, bird cage bird bath, Inflatable bathtub, clawfoot bathtub, hot tub, foot bath.",
                "7 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.",
                "Described in 77 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 bathtub, 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": [
                        "plunge dip",
                        "bird bath",
                        "bird cage bird bath",
                        "Inflatable bathtub",
                        "clawfoot bathtub",
                        "hot tub",
                        "foot bath"
                    ]
                }
            ],
            "standing": "Described in 77 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 7 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 bathtub from another, and a bathtub 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 bathtub, 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 bathtub, 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 bathtub 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 bathtub, 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 bathtub, 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 bathtub 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 bathtub 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 bathtub, 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 bathtub, 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 bathtub 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 bathtub from the things most often confused with it.",
                                        "questions": [
                                            {
                                                "id": "distinguishing-features-q01",
                                                "text": "What identifies and describes what distinguishes a bathtub, 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 bathtub, 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 bathtub 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 bathtub 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 bathtub, 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 bathtub, 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 bathtub 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 bathtub is built from and which parts are replaceable.",
                                        "questions": [
                                            {
                                                "id": "parts-and-materials-q01",
                                                "text": "What identifies and describes the composition of a bathtub, 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 bathtub, 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 bathtub 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 bathtub is judged and by whom.",
                                        "questions": [
                                            {
                                                "id": "condition-assessment-q01",
                                                "text": "What identifies and describes the condition of a bathtub, 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 bathtub, 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 bathtub 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 bathtub 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 bathtub is, and what that position is measured against.",
                                        "questions": [
                                            {
                                                "id": "position-and-frame-q01",
                                                "text": "What identifies and describes the location of a bathtub, 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 bathtub, 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 bathtub 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 bathtub 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 bathtub, 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 bathtub, 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 bathtub 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 bathtub 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 bathtub between them.",
                                        "questions": [
                                            {
                                                "id": "stages-and-transitions-q01",
                                                "text": "What identifies and describes the lifecycle of a bathtub, 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 bathtub, 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 bathtub 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 bathtub, how often and by whom.",
                                "findings": [
                                    {
                                        "id": "observation-record",
                                        "name": "Observation record",
                                        "description": "How an observation of a bathtub 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 bathtub, 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 bathtub, 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 bathtub 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 bathtub 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 bathtub 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 bathtub, 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 bathtub 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 bathtub 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 bathtub 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 bathtub 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 bathtub 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 bathtub, 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 bathtub 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 bathtub and how confident it is.",
                                        "questions": [
                                            {
                                                "id": "claim-provenance-q01",
                                                "text": "What identifies and describes a claim about a bathtub, 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 bathtub, 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 bathtub 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 bathtub is retired without being erased.",
                                        "questions": [
                                            {
                                                "id": "validity-and-supersession-q01",
                                                "text": "What identifies and describes the validity of a claim about a bathtub, 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 bathtub, 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 bathtub 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
            }
        }
    }
}