{
    "model": {
        "rank": 4713,
        "code": "thing-q171058",
        "model_id": "vr.tr.opal",
        "name": "opal",
        "purpose": "Enable an agent to recognise opal, assess its material and gemological state, and select suitable identification, handling, and use actions.",
        "family": "Thing Registry",
        "category": "Physical world and living systems",
        "status": "research-draft",
        "kind": "thing",
        "plane": "PHY",
        "domain": "PHY.MAT",
        "industry": "",
        "version": "",
        "url": "/models/thing/q171058/",
        "tier": 2,
        "score": 73,
        "payload": {
            "layer": "wikidata",
            "aliases": [
                "opal-A",
                "opalite",
                "Slocum stone",
                "girasol",
                "bobkovite",
                "Yowah Nut",
                "moss opal",
                "hydrophane",
                "cacholong",
                "Fiorite",
                "fire opal",
                "menilite",
                "wood opal"
            ],
            "aliasCount": 13,
            "merged": 13,
            "knownIn": 73,
            "facets": null,
            "markers": [],
            "lexicalClass": "",
            "senseRank": null,
            "alsoRegisteredAs": "vr.tr.opal",
            "source": {
                "dataset": "wikidata",
                "item": "Q171058",
                "url": "https://www.wikidata.org/wiki/Q171058",
                "license": "CC0 1.0"
            }
        },
        "research": {
            "vercy": "1.0-draft",
            "publication": {
                "status": "research-draft",
                "adjudicationStatus": "unreviewed",
                "publishableCanonical": false,
                "generatedAt": "2026-09-09T20:50:27Z",
                "providers": [
                    "Codex"
                ],
                "breadth": "recalled by Codex without web access - no source was read",
                "missingProviders": [],
                "pass": 2,
                "cost": {
                    "grok": {
                        "seconds": 21.8,
                        "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: 01a087ee-c8a9-7281-a732-f43f880c61fc\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: opal\nSense to describe: (none recorded)\nDomain code: PHY.MAT\nAlso known as: (none)\n\n\nContext for this batch of 1001 things:\n# Batch 005: 1001 registered",
                        "usd": 0,
                        "recall": true
                    },
                    "codex": {
                        "seconds": 59.7,
                        "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: 01a087ee-c8a9-73d0-aa45-9c0742eee672\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: opal\nRegistry id: vr.tr.opal\nPlane / domain: PHY / PHY.MAT\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\n\nContext for th"
                    }
                }
            },
            "metaModel": {
                "id": "THING-Q171058",
                "registryId": "vr.tr.opal",
                "name": "opal",
                "version": "0.1.0-research.1",
                "entryKind": "thing",
                "family": "Thing Registry",
                "domain": [
                    "PHY.MAT"
                ],
                "status": "research-draft"
            },
            "canonicalUrl": "https://ver.cy/models/thing/q171058/",
            "model": {
                "registry_id": "vr.tr.opal",
                "name": "opal",
                "purpose": "Enable an agent to recognise opal, assess its material and gemological state, and select suitable identification, handling, and use actions.",
                "definition": "Opal is a naturally occurring hydrated silica mineraloid, conventionally written SiO₂·nH₂O, whose silica structure ranges from amorphous to poorly crystalline and which may exhibit play-of-colour.",
                "scope_statement": "This model owns opal as a hydrated silica material, including natural and synthetic specimens, optical varieties, treatments, and condition; it records boundaries with host rock, imitations, and assembled products.",
                "in_scope": [
                    "Hydrated silica composition, water content, impurities, and structural classification",
                    "Natural or synthetic origin and evidence supporting identification",
                    "Play-of-colour, body colour, transparency, and optical uniformity",
                    "Porosity, water uptake, cracking, and changes under environmental exposure",
                    "Treatments, matrix relationships, and suitability for specimen or gem use"
                ],
                "out_of_scope": [
                    "Quartz, chalcedony, glass, and other materials mistaken for opal",
                    "Complete geological deposits and mining operations",
                    "Jewellery settings and finished jewellery products",
                    "Backing materials, adhesives, and protective caps in assembled stones",
                    "Commercial valuation, ownership, and trading transactions"
                ],
                "distinguishing_features": [
                    "Establish hydrated silica identity and structural evidence rather than identifying opal solely from colour or trade name.",
                    "Distinguish play-of-colour from body colour, surface iridescence, and isolated reflections; absence of play-of-colour does not by itself exclude opal.",
                    "Assess natural versus synthetic origin separately from whether the material is opal; distinguish both from imitations.",
                    "Inspect interfaces to distinguish a single opal piece, opal attached to host rock, and an assembled doublet or triplet.",
                    "Test or document water uptake separately from appearance; hydrophane behaviour must not be assumed for every specimen."
                ],
                "characteristics": [
                    {
                        "name": "Material identity",
                        "kind": "category",
                        "unit_or_values": "opal confirmed | opal suspected | imitation | unresolved",
                        "why_it_matters": "Controls whether this model applies and how confidently subsequent actions can proceed."
                    },
                    {
                        "name": "Origin",
                        "kind": "category",
                        "unit_or_values": "natural | synthetic | unresolved",
                        "why_it_matters": "Supports accurate identification and disclosure without conflating synthetic opal with imitation."
                    },
                    {
                        "name": "Water content",
                        "kind": "measurement",
                        "unit_or_values": "mass %, with analytical method and specimen conditioning",
                        "why_it_matters": "Characterises the material while distinguishing measurements made under different conditions."
                    },
                    {
                        "name": "Structural classification",
                        "kind": "category",
                        "unit_or_values": "reported analytical class, method, confidence, or unclassified",
                        "why_it_matters": "Separates measured internal structure from appearance-based variety names."
                    },
                    {
                        "name": "Play-of-colour",
                        "kind": "state",
                        "unit_or_values": "present | absent | uncertain; colours, pattern, viewing angles, and illumination",
                        "why_it_matters": "Records a defining optical distinction among opal varieties."
                    },
                    {
                        "name": "Body appearance",
                        "kind": "category",
                        "unit_or_values": "body colour, tone, and transparency under stated observation conditions",
                        "why_it_matters": "Prevents body colour from being confused with play-of-colour or treatment effects."
                    },
                    {
                        "name": "Water uptake",
                        "kind": "measurement",
                        "unit_or_values": "mass change %, exposure duration, liquid, temperature, and recovery conditions",
                        "why_it_matters": "Supports assessment of hydrophane behaviour and exposure sensitivity when testing is appropriate."
                    },
                    {
                        "name": "Physical condition",
                        "kind": "state",
                        "unit_or_values": "intact | cracked | crazed | chipped | altered; location and extent",
                        "why_it_matters": "Determines handling needs and whether processing may worsen damage."
                    },
                    {
                        "name": "Treatment status",
                        "kind": "category",
                        "unit_or_values": "untreated supported | treatment detected | treatment reported | unknown; treatment type",
                        "why_it_matters": "Affects interpretation of appearance, stability, care, and disclosure."
                    },
                    {
                        "name": "Material associations",
                        "kind": "relation",
                        "unit_or_values": "host rock, matrix, backing, cap, adhesive, or none observed",
                        "why_it_matters": "Locates the opal boundary and identifies components requiring separate assessment."
                    }
                ],
                "affordances": [
                    "Select identification observations or laboratory tests that resolve specific uncertainties.",
                    "Classify optical behaviour while preserving lighting and viewing conditions.",
                    "Assess whether cleaning, wetting, drying, heating, or storage changes are appropriate for the specimen.",
                    "Evaluate suitability for cutting, polishing, mounting, or specimen preservation.",
                    "Record origin and treatment disclosures with supporting evidence.",
                    "Monitor cracking, colour, transparency, and mass for changes over time."
                ]
            },
            "sources": [],
            "structure": {
                "bundles": [
                    {
                        "id": "opal-identity",
                        "name": "Opal identity",
                        "description": "Establish whether the material is opal and define the physical extent of that identification.",
                        "rationale": "Appearance alone cannot resolve opal identity, origin, or composite construction.",
                        "layers": [
                            {
                                "id": "silica-and-water",
                                "name": "Silica and water",
                                "description": "Connect material identification to composition and structural evidence.",
                                "findings": [
                                    {
                                        "id": "identity-evidence",
                                        "name": "Identity evidence",
                                        "description": "Record evidence supporting hydrated silica identification and any unresolved alternative.",
                                        "questions": [
                                            {
                                                "text": "What observations or analyses support identifying this material as opal rather than glass, quartz, or another silica material?",
                                                "kind": "definition",
                                                "id": "identity-evidence-q01"
                                            },
                                            {
                                                "text": "What composition, water-content, or structural measurements exist, and how were they obtained?",
                                                "kind": "measurement",
                                                "id": "identity-evidence-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "specimen-boundaries",
                                "name": "Specimen boundaries",
                                "description": "Separate opal from associated geological and manufactured components.",
                                "findings": [
                                    {
                                        "id": "opal-bearing-components",
                                        "name": "Opal-bearing components",
                                        "description": "Locate opal within a specimen, matrix, or assembled stone.",
                                        "questions": [
                                            {
                                                "text": "Is the examined object entirely opal, opal within or attached to host rock, or an assembled stone?",
                                                "kind": "boundary",
                                                "id": "opal-bearing-components-q01"
                                            },
                                            {
                                                "text": "Which visible or tested interfaces separate opal from matrix, backing, adhesive, or a cap?",
                                                "kind": "measurement",
                                                "id": "opal-bearing-components-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "optical-expression",
                        "name": "Optical expression",
                        "description": "Describe opal appearance through reproducible observations.",
                        "rationale": "Opal variety and practical gem use depend on optical behaviour that changes with observation conditions.",
                        "layers": [
                            {
                                "id": "play-of-colour",
                                "name": "Play-of-colour",
                                "description": "Characterise the presence and distribution of changing spectral colours.",
                                "findings": [
                                    {
                                        "id": "directional-colour-observation",
                                        "name": "Directional colour observation",
                                        "description": "Document colour changes with illumination and orientation without assuming their cause from a single image.",
                                        "questions": [
                                            {
                                                "text": "Is play-of-colour visible, and under which illumination and viewing angles?",
                                                "kind": "measurement",
                                                "id": "directional-colour-observation-q01"
                                            },
                                            {
                                                "text": "How were play-of-colour, surface reflections, and other iridescent effects distinguished?",
                                                "kind": "boundary",
                                                "id": "directional-colour-observation-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "body-appearance",
                                "name": "Body appearance",
                                "description": "Separate underlying colour and transparency from directional optical effects.",
                                "findings": [
                                    {
                                        "id": "appearance-classification",
                                        "name": "Appearance classification",
                                        "description": "Record descriptive appearance and the criteria behind any variety or trade name.",
                                        "questions": [
                                            {
                                                "text": "What body colour, tone, and transparency are observed under stated lighting and background conditions?",
                                                "kind": "measurement",
                                                "id": "appearance-classification-q01"
                                            },
                                            {
                                                "text": "Which criteria support labels such as precious, common, fire, or black opal, and can more than one label apply?",
                                                "kind": "definition",
                                                "id": "appearance-classification-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "water-and-integrity",
                        "name": "Water and integrity",
                        "description": "Assess water interaction, environmental response, and physical damage.",
                        "rationale": "A specimen's exposure response and existing damage determine which handling actions are suitable.",
                        "layers": [
                            {
                                "id": "water-response",
                                "name": "Water response",
                                "description": "Distinguish documented hydrophane behaviour from untested assumptions.",
                                "findings": [
                                    {
                                        "id": "uptake-and-recovery",
                                        "name": "Uptake and recovery",
                                        "description": "Record known water uptake and associated appearance changes, including reversibility.",
                                        "questions": [
                                            {
                                                "text": "What evidence establishes whether this specimen exhibits hydrophane behaviour?",
                                                "kind": "measurement",
                                                "id": "uptake-and-recovery-q01"
                                            },
                                            {
                                                "text": "Would a wetting test risk alteration, and what existing evidence or less intrusive observation could answer the question?",
                                                "kind": "action",
                                                "id": "uptake-and-recovery-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "damage-and-change",
                                "name": "Damage and change",
                                "description": "Track cracks and other alterations against exposure history.",
                                "findings": [
                                    {
                                        "id": "integrity-baseline",
                                        "name": "Integrity baseline",
                                        "description": "Establish specimen-specific condition and distinguish observed change from proposed causes.",
                                        "questions": [
                                            {
                                                "text": "Where are cracks, crazing, chips, or altered areas, and what observations establish their extent?",
                                                "kind": "measurement",
                                                "id": "integrity-baseline-q01"
                                            },
                                            {
                                                "text": "What changes followed documented temperature, humidity, liquid, or storage exposures, and which causal explanations remain uncertain?",
                                                "kind": "provenance",
                                                "id": "integrity-baseline-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "origin-and-enhancement",
                        "name": "Origin and enhancement",
                        "description": "Evaluate natural or synthetic origin, geographic claims, and treatment history.",
                        "rationale": "These claims affect recognition, care, and disclosure but require distinct supporting evidence.",
                        "layers": [
                            {
                                "id": "formation-and-source",
                                "name": "Formation and source",
                                "description": "Distinguish origin determinations from locality assertions.",
                                "findings": [
                                    {
                                        "id": "origin-claims",
                                        "name": "Origin claims",
                                        "description": "Attach confidence and evidence to natural, synthetic, and geographic origin claims.",
                                        "questions": [
                                            {
                                                "text": "What evidence supports natural or synthetic origin, and which identification limitations remain?",
                                                "kind": "provenance",
                                                "id": "origin-claims-q01"
                                            },
                                            {
                                                "text": "Is a claimed locality supported by collection records, laboratory evidence, a supplier statement, or no traceable evidence?",
                                                "kind": "provenance",
                                                "id": "origin-claims-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "treatment-evidence",
                                "name": "Treatment evidence",
                                "description": "Record interventions that may affect appearance or material behaviour.",
                                "findings": [
                                    {
                                        "id": "enhancement-status",
                                        "name": "Enhancement status",
                                        "description": "Distinguish detected or reported treatments from unknown treatment status.",
                                        "questions": [
                                            {
                                                "text": "Is there evidence of dyeing, impregnation, smoke or sugar treatment, coating, or another intervention?",
                                                "kind": "measurement",
                                                "id": "enhancement-status-q01"
                                            },
                                            {
                                                "text": "What treatment records or test limitations affect whether the specimen can be described as untreated?",
                                                "kind": "provenance",
                                                "id": "enhancement-status-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "handling-and-working",
                        "name": "Handling and working",
                        "description": "Translate identification and condition into specimen-specific care and processing decisions.",
                        "rationale": "Useful opal assessment must connect material evidence to actions an agent can recommend or defer.",
                        "layers": [
                            {
                                "id": "care-decisions",
                                "name": "Care decisions",
                                "description": "Choose cleaning and storage practices from documented specimen behaviour.",
                                "findings": [
                                    {
                                        "id": "exposure-suitability",
                                        "name": "Exposure suitability",
                                        "description": "Assess proposed care actions against water response, treatments, and construction.",
                                        "questions": [
                                            {
                                                "text": "Which cleaning liquids, cleaning methods, and storage conditions are supported for this specimen's condition and treatment status?",
                                                "kind": "action",
                                                "id": "exposure-suitability-q01"
                                            },
                                            {
                                                "text": "Which uncertainties about water uptake, coatings, or bonded components require specialist assessment before care proceeds?",
                                                "kind": "action",
                                                "id": "exposure-suitability-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "lapidary-suitability",
                                "name": "Lapidary suitability",
                                "description": "Assess opal-specific constraints on cutting, polishing, and mounting.",
                                "findings": [
                                    {
                                        "id": "working-plan",
                                        "name": "Working plan",
                                        "description": "Connect colour orientation, opal thickness, matrix, and fractures to a proposed working action.",
                                        "questions": [
                                            {
                                                "text": "How do colour orientation, opal-bearing thickness, matrix boundaries, and fractures constrain cutting or polishing?",
                                                "kind": "action",
                                                "id": "working-plan-q01"
                                            },
                                            {
                                                "text": "What controls are required for generated dust and process heat, considering the identified opal, host rock, and treatment materials?",
                                                "kind": "action",
                                                "id": "working-plan-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 geological and gemological material; the listed varieties overlap rather than forming mutually exclusive classes.",
                                            "Property ranges are approximate recall values; porosity, water content, inclusions and host rock can affect measurements.",
                                            "Verify current CIBJO wording and specimen-specific treatment, origin and structural classification before formal publication."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-confidence-notes-q01",
                                                "text": "Which of these check these first hold for the sense of opal 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": [
                                            "Precious opal: exhibits play-of-colour",
                                            "Common opal: lacks play-of-colour",
                                            "Fire opal: yellow, orange or red body colour, with or without play-of-colour",
                                            "Black opal: dark body tone",
                                            "Boulder opal: opal retained with its natural host rock",
                                            "Hydrophane opal: porous opal that absorbs water, potentially changing transparency and appearance"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-kinds-q01",
                                                "text": "Which of these kinds and varieties hold for the sense of opal this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-identifiers",
                                        "name": "Identifiers and schemes",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            {
                                                "scheme": "Chemical formula",
                                                "value_or_pattern": "SiO₂·nH₂O",
                                                "note": "Conventional compositional notation; water content varies, so this is not a fixed molecular formula."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-identifiers-q01",
                                                "text": "Which of these identifiers and schemes hold for the sense of opal 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": [
                                            "CIBJO, the World Jewellery Confederation, publishes the Gemstone Book covering gemstone nomenclature and disclosure, relevant to natural, synthetic, treated and assembled opal."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-standards-and-regulation-q01",
                                                "text": "Which of these standards and regulation hold for the sense of opal 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": [
                                            "Gemstones in jewellery, commonly cut as cabochons",
                                            "Decorative carvings and ornamental objects",
                                            "Mineralogical collections and geological research",
                                            "Research into structural colour and naturally occurring photonic structures"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-real-world-use-q01",
                                                "text": "Which of these real-world use hold for the sense of opal 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": "Mohs hardness",
                                                "typical_range": "5.5-6.5",
                                                "unit": "Mohs scale"
                                            },
                                            {
                                                "quantity": "Refractive index",
                                                "typical_range": "Approximately 1.37-1.47",
                                                "unit": "dimensionless"
                                            },
                                            {
                                                "quantity": "Density",
                                                "typical_range": "Approximately 1.98-2.25",
                                                "unit": "g/cm³"
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-measurements-q01",
                                                "text": "Which of these typical measurements hold for the sense of opal 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": [
                                            "Some opals develop crazing, a network of cracks associated with water loss or environmental changes.",
                                            "Brittleness makes opal vulnerable to impact damage, chipping and fracture.",
                                            "Moderate hardness permits scratching and abrasion during wear.",
                                            "Porous hydrophane material can absorb liquids, causing changes in appearance or staining.",
                                            "Cutting and grinding generate dust requiring control; host rock may contain crystalline silica."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-failure-modes-and-hazards-q01",
                                                "text": "Which of these failure modes and hazards hold for the sense of opal 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": [
                                            "Australian deposits include commercially important black, white and boulder opal.",
                                            "Ethiopian deposits include commercially important hydrophane opal, although origin alone does not establish absorption behaviour.",
                                            "Mexico is particularly associated with fire opal."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-regional-variation-q01",
                                                "text": "Which of these regional variation hold for the sense of opal 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": "Quartz",
                                                "difference": "Quartz has a well-defined crystalline SiO₂ structure; opal is hydrated silica with amorphous or poorly crystalline structure."
                                            },
                                            {
                                                "name": "Chalcedony",
                                                "difference": "Chalcedony is microcrystalline silica dominated by quartz-related structures rather than opal's hydrated, disordered silica structure."
                                            },
                                            {
                                                "name": "Synthetic opal",
                                                "difference": "Synthetic opal is manufactured rather than geologically formed; distinguishing specimens may require microscopic and laboratory examination."
                                            },
                                            {
                                                "name": "Opal doublet or triplet",
                                                "difference": "These are assembled products combining an opal layer with backing and, for triplets, a transparent cap."
                                            },
                                            {
                                                "name": "Opalite glass",
                                                "difference": "Opalite glass is manufactured glass marketed for its opalescent appearance, rather than natural opal."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-neighbours-q01",
                                                "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of opal this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "openQuestions": [
                "Which authoritative terminology and analytical criteria should govern opal structural classes and overlapping gemological variety names?",
                "Which identification methods reliably distinguish natural opal, synthetic opal, imitations, and treatments across the varieties covered?",
                "What specimen-specific evidence can support environmental care limits and predictions of cracking or irreversible appearance change?",
                "Which CAS, EC, or other substance identifiers apply to particular opal materials, and when would using a generic silica identifier misrepresent them?",
                "Which occupational exposure requirements apply when working opal with different host rocks, impurities, and treatments?"
            ],
            "statistics": {
                "bundles": 6,
                "layers": 11,
                "findings": 19,
                "questions": 29
            }
        },
        "draft": {
            "generator": "vr.draft.v3",
            "status": "draft-generated",
            "researched": false,
            "archetype": "chemical substance or material",
            "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 opal, record what state it is in, and decide what may be done with it.",
            "whatItIs": "Enable an agent to recognise opal, assess its material and gemological state, and select suitable identification, handling, and use actions.",
            "characteristics": {
                "substance": "material",
                "origin": "natural",
                "agency": "inert",
                "mobility": "varies"
            },
            "whatYouCanDoWithIt": [
                "observed and measured",
                "consumed or used up"
            ],
            "distinguishingFeatures": [
                "Names folded into this entry, which a task may need to split apart again: opal-A, opalite, Slocum stone, girasol, bobkovite, Yowah Nut, moss opal, hydrophane, cacholong, Fiorite, fire opal, menilite.",
                "13 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.",
                "Described in 73 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 opal, 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",
                "use it up, and then need more of it"
            ],
            "howItIsRecognised": [
                "Not recognisable by sight in any reliable way. Appearance varies with grade, form and additives; identification is by label, by documentation, or by assay."
            ],
            "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": [
                        "opal-A",
                        "opalite",
                        "Slocum stone",
                        "girasol",
                        "bobkovite",
                        "Yowah Nut",
                        "moss opal",
                        "hydrophane",
                        "cacholong",
                        "Fiorite",
                        "fire opal",
                        "menilite"
                    ]
                }
            ],
            "standing": "Described in 73 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 13 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 opal from another, and a opal 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 opal, 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 opal, 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 opal 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 opal, 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 opal, 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 opal 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 opal 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 opal, 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 opal, 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 opal 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 opal from the things most often confused with it.",
                                        "questions": [
                                            {
                                                "id": "distinguishing-features-q01",
                                                "text": "What identifies and describes what distinguishes a opal, 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 opal, 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 opal 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 opal 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 opal, 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 opal, 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 opal 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 opal is built from and which parts are replaceable.",
                                        "questions": [
                                            {
                                                "id": "parts-and-materials-q01",
                                                "text": "What identifies and describes the composition of a opal, 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 opal, 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 opal 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 opal is judged and by whom.",
                                        "questions": [
                                            {
                                                "id": "condition-assessment-q01",
                                                "text": "What identifies and describes the condition of a opal, 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 opal, 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 opal 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 opal 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 opal is, and what that position is measured against.",
                                        "questions": [
                                            {
                                                "id": "position-and-frame-q01",
                                                "text": "What identifies and describes the location of a opal, 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 opal, 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 opal 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 opal 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 opal, 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 opal, 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 opal 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 opal 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 opal between them.",
                                        "questions": [
                                            {
                                                "id": "stages-and-transitions-q01",
                                                "text": "What identifies and describes the lifecycle of a opal, 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 opal, 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 opal 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 opal, how often and by whom.",
                                "findings": [
                                    {
                                        "id": "observation-record",
                                        "name": "Observation record",
                                        "description": "How an observation of a opal 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 opal, 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 opal, 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 opal is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "use-and-operation",
                        "name": "Use and operation",
                        "description": "What can be done with a opal and what it takes to do it.",
                        "rationale": "An agent that can recognise a thing but not act on it has only half a model.",
                        "layers": [
                            {
                                "id": "intended-use",
                                "name": "Intended use and function",
                                "description": "What a opal is for, and what it is used for anyway.",
                                "findings": [
                                    {
                                        "id": "function-and-purpose",
                                        "name": "Function, purpose and misuse",
                                        "description": "The function a opal performs and the uses that fall outside it.",
                                        "questions": [
                                            {
                                                "id": "function-and-purpose-q01",
                                                "text": "What identifies and describes the use of a opal, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "function-and-purpose-q02",
                                                "text": "Who or what asserted this about the use of a opal, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "function-and-purpose-q03",
                                                "text": "What may an agent decide or do once the use of a opal is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "handling-and-procedure",
                                "name": "Handling and procedure",
                                "description": "The steps, skills and tools involved in using a opal.",
                                "findings": [
                                    {
                                        "id": "procedures-and-skills",
                                        "name": "Procedures, skills and required tools",
                                        "description": "What an agent needs before it can act on a opal at all.",
                                        "questions": [
                                            {
                                                "id": "procedures-and-skills-q01",
                                                "text": "What identifies and describes handling a opal, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "procedures-and-skills-q02",
                                                "text": "Who or what asserted this about handling a opal, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "procedures-and-skills-q03",
                                                "text": "What may an agent decide or do once handling a opal is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "supply-and-consumption",
                                "name": "Supply and consumption",
                                "description": "Quantities, rates and what running out means.",
                                "findings": [
                                    {
                                        "id": "consumption-and-stock",
                                        "name": "Consumption, stock and replenishment",
                                        "description": "How much of a opal there is and how fast it goes.",
                                        "questions": [
                                            {
                                                "id": "consumption-and-stock-q01",
                                                "text": "What identifies and describes the supply of a opal, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "consumption-and-stock-q02",
                                                "text": "Who or what asserted this about the supply of a opal, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "consumption-and-stock-q03",
                                                "text": "What may an agent decide or do once the supply of a opal is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "composition-and-identity",
                        "name": "Composition, grade and chemical identity",
                        "description": "What opal is made of and how pure the thing in hand is.",
                        "rationale": "Grade decides what a substance may be used for, so a model that records only the name cannot support any decision about use.",
                        "layers": [
                            {
                                "id": "chemical-identity",
                                "name": "Chemical identity",
                                "description": "Formula, structure and the registry numbers that name it unambiguously.",
                                "findings": [
                                    {
                                        "id": "identity-record",
                                        "name": "Identity and registry numbers",
                                        "description": "What identifies this substance across suppliers and regulators.",
                                        "questions": [
                                            {
                                                "id": "identity-record-q01",
                                                "text": "What formula, structure and registry identifiers name opal unambiguously?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "identity-record-q02",
                                                "text": "Which related substances share a name in common use but not an identifier?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "grade-and-impurities",
                                "name": "Grade, purity and impurities",
                                "description": "The specification a batch meets and what else is in it.",
                                "findings": [
                                    {
                                        "id": "specification",
                                        "name": "Specification and assay",
                                        "description": "How purity is stated and measured, and which impurities matter.",
                                        "questions": [
                                            {
                                                "id": "specification-q01",
                                                "text": "What grades of opal exist, how is purity assayed, and which impurities are limited?",
                                                "kind": "measurement"
                                            },
                                            {
                                                "id": "specification-q02",
                                                "text": "Which use requires which grade, and what happens when a lower grade is substituted?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "properties-and-behaviour",
                        "name": "Properties and behaviour",
                        "description": "How opal behaves under conditions an agent can measure or change.",
                        "rationale": "Physical constants are the part of a substance model that transfers between contexts, and each needs its unit and its conditions.",
                        "layers": [
                            {
                                "id": "physical-constants",
                                "name": "Physical constants",
                                "description": "Values that hold for the pure substance, with their conditions.",
                                "findings": [
                                    {
                                        "id": "constants-record",
                                        "name": "Constants and conditions",
                                        "description": "The quantities worth recording and the state they apply in.",
                                        "questions": [
                                            {
                                                "id": "constants-record-q01",
                                                "text": "What are the defining physical constants of opal, in what units and under what conditions?",
                                                "kind": "measurement"
                                            },
                                            {
                                                "id": "constants-record-q02",
                                                "text": "Which of these values change with grade or form rather than being fixed?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "stability-and-reactivity",
                                "name": "Stability and reactivity",
                                "description": "What it reacts with, degrades into, and how it is stored.",
                                "findings": [
                                    {
                                        "id": "incompatibilities",
                                        "name": "Incompatibilities and degradation",
                                        "description": "What must not meet it, and what it becomes over time.",
                                        "questions": [
                                            {
                                                "id": "incompatibilities-q01",
                                                "text": "What is opal incompatible with, and what does it degrade into under storage?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "incompatibilities-q02",
                                                "text": "What storage and handling does that require, and who is competent to do it?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "hazard-and-regulation",
                        "name": "Hazard classification and regulation",
                        "description": "How opal can harm, and what the law says about holding and moving it.",
                        "rationale": "A substance model without its hazard class and its regulatory identity is unusable in exactly the situations that matter.",
                        "layers": [
                            {
                                "id": "hazard-class",
                                "name": "Hazard classification",
                                "description": "Classified hazards, exposure limits and protective measures.",
                                "findings": [
                                    {
                                        "id": "classified-hazards",
                                        "name": "Classified hazards and limits",
                                        "description": "The classification, the scheme it belongs to, and the limits set.",
                                        "questions": [
                                            {
                                                "id": "classified-hazards-q01",
                                                "text": "How is opal classified for hazard, under which scheme, and what exposure limits apply?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "classified-hazards-q02",
                                                "text": "What protection does handling require, and what must an agent refuse to do without it?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "regulatory-identity",
                                "name": "Regulatory identity and control",
                                "description": "Registration, restriction and transport rules by jurisdiction.",
                                "findings": [
                                    {
                                        "id": "controls",
                                        "name": "Controls and jurisdiction",
                                        "description": "Where it is restricted and what the restriction attaches to.",
                                        "questions": [
                                            {
                                                "id": "controls-q01",
                                                "text": "Which registrations, restrictions or transport rules cover opal, and where?",
                                                "kind": "provenance"
                                            },
                                            {
                                                "id": "controls-q02",
                                                "text": "Does the control attach to the substance, its concentration, or its intended use?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "provenance-and-evidence",
                        "name": "Provenance, evidence and time",
                        "description": "Where every claim about a opal 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 opal and how confident it is.",
                                        "questions": [
                                            {
                                                "id": "claim-provenance-q01",
                                                "text": "What identifies and describes a claim about a opal, 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 opal, 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 opal 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 opal is retired without being erased.",
                                        "questions": [
                                            {
                                                "id": "validity-and-supersession-q01",
                                                "text": "What identifies and describes the validity of a claim about a opal, 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 opal, 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 opal is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "statistics": {
                "bundles": 9,
                "layers": 20,
                "findings": 22,
                "questions": 60
            }
        }
    }
}