{
    "model": {
        "rank": 2926,
        "code": "thing-q2409",
        "model_id": "vr.tr.hydrochloric-acid",
        "name": "hydrochloric acid",
        "purpose": "Enable an AI agent to recognise an aqueous hydrochloric acid material, assess its composition and condition, and determine which uses, transfers or restrictions are justified by the available evidence.",
        "family": "Thing Registry",
        "category": "Physical world and living systems",
        "status": "research-draft",
        "kind": "thing",
        "plane": "PHY",
        "domain": "PHY.MAT",
        "industry": "",
        "version": "",
        "url": "/models/thing/q2409/",
        "tier": 2,
        "score": 94,
        "payload": {
            "layer": "wikidata",
            "aliases": [],
            "aliasCount": 0,
            "merged": 0,
            "knownIn": 94,
            "facets": null,
            "markers": [],
            "lexicalClass": "",
            "senseRank": null,
            "alsoRegisteredAs": "vr.tr.hydrochloric-acid",
            "source": {
                "dataset": "wikidata",
                "item": "Q2409",
                "url": "https://www.wikidata.org/wiki/Q2409",
                "license": "CC0 1.0"
            }
        },
        "research": {
            "vercy": "1.0-draft",
            "publication": {
                "status": "research-draft",
                "adjudicationStatus": "unreviewed",
                "publishableCanonical": false,
                "generatedAt": "2026-09-07T13:42:48Z",
                "providers": [
                    "Codex",
                    "Grok"
                ],
                "missingProviders": [],
                "pass": 2,
                "cost": {
                    "grok": {
                        "usd": 0.00209236,
                        "turns": 1,
                        "seconds": 24.3,
                        "error": null
                    },
                    "codex": {
                        "seconds": 75.4,
                        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.3\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a07c1a-4ea4-78f2-92c3-1d4c3bdb759e\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: hydrochloric acid\nRegistry id: vr.tr.hydrochloric-acid\nPlane / domain: PHY / PHY.MAT\nRegistry definition: (none recorded)\nNames folded into this entr"
                    }
                }
            },
            "metaModel": {
                "id": "THING-Q2409",
                "registryId": "vr.tr.hydrochloric-acid",
                "name": "hydrochloric acid",
                "version": "0.1.0-research.1",
                "entryKind": "thing",
                "family": "Thing Registry",
                "domain": [
                    "PHY.MAT"
                ],
                "status": "research-draft"
            },
            "canonicalUrl": "https://ver.cy/models/thing/q2409/",
            "model": {
                "registry_id": "vr.tr.hydrochloric-acid",
                "name": "hydrochloric acid",
                "purpose": "Enable an AI agent to recognise an aqueous hydrochloric acid material, assess its composition and condition, and determine which uses, transfers or restrictions are justified by the available evidence.",
                "definition": "Aqueous hydrogen chloride (HCl(aq)), a strong monoprotic mineral acid whose practical identity is the concentration and grade of the water-HCl mixture rather than the anhydrous gas.",
                "scope_statement": "This model owns the identity, composition, physical condition, chemical behaviour and evidence-based action boundaries of hydrochloric acid as an aqueous material, including commercial grades and identified batches.",
                "in_scope": [
                    "Identification of aqueous hydrogen chloride as hydrochloric acid",
                    "Hydrogen chloride concentration, reporting basis and compositional uncertainty",
                    "Grade, impurities, additives and changes caused by use or storage",
                    "Physical condition and concentration-dependent behaviour",
                    "Chemical compatibility and suitability for an identified intended use"
                ],
                "out_of_scope": [
                    "Anhydrous hydrogen chloride gas and liquefied hydrogen chloride",
                    "Equipment, containers and storage facilities as independently managed assets",
                    "Manufacturing, dilution, cleaning and neutralisation procedures",
                    "Human exposure, clinical treatment and occupational health records",
                    "Transport consignments, permits and waste-management workflows"
                ],
                "distinguishing_features": [
                    "Establish that the material is hydrogen chloride dissolved in water; a hydrogen chloride identifier alone does not distinguish hydrochloric acid from anhydrous hydrogen chloride.",
                    "Require evidence for both hydrochloric acidity and chloride-containing composition; low pH alone also describes other acids.",
                    "Distinguish hydrochloric acid from chloride salt solutions: chloride detection alone does not establish that hydrogen chloride is the defining acidic component.",
                    "Treat 'muriatic acid' as a possible commercial name for hydrochloric acid, then verify concentration and additives rather than assigning a different substance identity.",
                    "Distinguish hydrochloric acid from mixed-acid formulations and spent process liquors by establishing whether other acids, dissolved reaction products or additives now define the material's behaviour."
                ],
                "characteristics": [
                    {
                        "name": "Aqueous hydrochloric acid identity",
                        "kind": "category",
                        "unit_or_values": "confirmed | provisionally identified | unresolved | outside scope",
                        "why_it_matters": "Prevents names, acidity or chloride content alone from establishing an unsupported material identity."
                    },
                    {
                        "name": "Hydrogen chloride content",
                        "kind": "measurement",
                        "unit_or_values": "mass fraction as % w/w, or another explicitly stated basis; include method, date and uncertainty",
                        "why_it_matters": "Concentration governs use suitability and strongly affects relevant physical and chemical behaviour."
                    },
                    {
                        "name": "Amount concentration",
                        "kind": "measurement",
                        "unit_or_values": "mol/L with solution temperature and measured or derived status",
                        "why_it_matters": "Supports quantity-dependent assessment while exposing assumptions in conversions from mass fraction."
                    },
                    {
                        "name": "Temperature",
                        "kind": "measurement",
                        "unit_or_values": "°C",
                        "why_it_matters": "Provides context for density, volume-based concentration, vapour behaviour and compatibility assessments."
                    },
                    {
                        "name": "Density",
                        "kind": "measurement",
                        "unit_or_values": "kg/m³ or g/mL at a stated temperature",
                        "why_it_matters": "Supports consistency checks and conversions, but cannot establish concentration without suitable composition assumptions."
                    },
                    {
                        "name": "Acidity measurement",
                        "kind": "measurement",
                        "unit_or_values": "pH or titratable acidity, with method and any sample dilution explicitly recorded",
                        "why_it_matters": "Distinguishes observed acidity from hydrogen chloride content and avoids overinterpreting pH in concentrated solutions."
                    },
                    {
                        "name": "Grade and conformance",
                        "kind": "category",
                        "unit_or_values": "supplier-declared grade, governing specification and conformance status",
                        "why_it_matters": "A grade claim is useful only when linked to the impurity limits and evidence needed for the intended use."
                    },
                    {
                        "name": "Impurity and additive profile",
                        "kind": "measurement",
                        "unit_or_values": "identified constituent concentrations in mg/kg, mg/L or another stated basis; include detection limits",
                        "why_it_matters": "Metals, other acids and intentional additives can change suitability, reactivity and interpretation of analytical results."
                    },
                    {
                        "name": "Observed material condition",
                        "kind": "state",
                        "unit_or_values": "appearance, colour, clarity, solids and reported fuming, with observation conditions",
                        "why_it_matters": "Changes may indicate contamination or altered composition without uniquely diagnosing their cause."
                    },
                    {
                        "name": "Contact-material compatibility",
                        "kind": "relation",
                        "unit_or_values": "specific contacting material linked to concentration, temperature, exposure duration and supporting assessment",
                        "why_it_matters": "Compatibility cannot safely be inferred from a broad material label alone."
                    },
                    {
                        "name": "Intended-use disposition",
                        "kind": "state",
                        "unit_or_values": "unassessed | supported for stated use | restricted | quarantined | rejected",
                        "why_it_matters": "Makes action eligibility depend on explicit requirements and current evidence."
                    }
                ],
                "affordances": [
                    "Identify and label an aqueous hydrochloric acid material using composition and provenance evidence.",
                    "Compare concentration and impurity results with the requirements of a stated use.",
                    "Flag incompatible contact materials or proposed mixing partners for review.",
                    "Determine whether a proposed transfer or use has adequate material-specific evidence and procedural authorisation.",
                    "Request qualified sampling or reassessment when identity, concentration or condition is uncertain.",
                    "Restrict or quarantine material whose composition, contamination history or use suitability is unresolved."
                ]
            },
            "sources": [
                {
                    "id": "pubchem-hcl",
                    "title": "Hydrochloric acid",
                    "url": "https://pubchem.ncbi.nlm.nih.gov/compound/Hydrochloric-acid",
                    "what_it_supports": "Identity, formula, CAS, concentration ranges",
                    "url_status": "live"
                }
            ],
            "structure": {
                "bundles": [
                    {
                        "id": "aqueous-acid-identity",
                        "name": "Aqueous acid identity",
                        "description": "Establish whether the material is hydrochloric acid and where that classification stops.",
                        "rationale": "Hydrochloric acid can be confused with anhydrous hydrogen chloride, other acidic liquids and chloride-containing solutions.",
                        "layers": [
                            {
                                "id": "aqueous-hydrogen-chloride",
                                "name": "Aqueous hydrogen chloride",
                                "description": "Connect the material's name to evidence of its defining aqueous composition.",
                                "findings": [
                                    {
                                        "id": "identity-evidence",
                                        "name": "Identity evidence",
                                        "description": "The agent must distinguish a supported aqueous hydrochloric acid identity from an unverified label.",
                                        "questions": [
                                            {
                                                "text": "What evidence establishes that this material is hydrogen chloride dissolved in water?",
                                                "kind": "definition",
                                                "id": "identity-evidence-q01"
                                            },
                                            {
                                                "text": "Which supplier record or analytical result supports the identity, and does it apply to this batch?",
                                                "kind": "provenance",
                                                "id": "identity-evidence-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "mixture-boundaries",
                                "name": "Mixture boundaries",
                                "description": "Resolve commercial names and compositions that may require a neighbouring mixture model.",
                                "findings": [
                                    {
                                        "id": "commercial-and-process-boundary",
                                        "name": "Commercial and process boundary",
                                        "description": "Names such as muriatic acid do not settle composition, and use can turn hydrochloric acid into a materially different process mixture.",
                                        "questions": [
                                            {
                                                "text": "Does a commercial name denote aqueous hydrochloric acid alone or a formulation with behaviour-changing additives?",
                                                "kind": "definition",
                                                "id": "commercial-and-process-boundary-q01"
                                            },
                                            {
                                                "text": "Do other acids or accumulated reaction products require classification under a mixed-acid or process-liquor model?",
                                                "kind": "boundary",
                                                "id": "commercial-and-process-boundary-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "concentration-and-analytical-basis",
                        "name": "Concentration and analytical basis",
                        "description": "Record hydrochloric acid strength without confusing concentration conventions or analytical proxies.",
                        "rationale": "A percentage, pH or acidity result cannot be interpreted reliably without its basis and measurement context.",
                        "layers": [
                            {
                                "id": "hcl-content",
                                "name": "Hydrogen chloride content",
                                "description": "Capture the amount of hydrogen chloride represented by the reported concentration.",
                                "findings": [
                                    {
                                        "id": "concentration-basis",
                                        "name": "Concentration basis",
                                        "description": "Every concentration claim must distinguish its reporting basis and whether it was measured, specified or calculated.",
                                        "questions": [
                                            {
                                                "text": "What is the hydrogen chloride concentration, and is it expressed as mass fraction, amount per volume or another defined basis?",
                                                "kind": "measurement",
                                                "id": "concentration-basis-q01"
                                            },
                                            {
                                                "text": "If the value was converted, which density, temperature and composition assumptions support that conversion?",
                                                "kind": "provenance",
                                                "id": "concentration-basis-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "analytical-interpretation",
                                "name": "Analytical interpretation",
                                "description": "Determine what acidity, chloride and density observations actually establish.",
                                "findings": [
                                    {
                                        "id": "proxy-limitations",
                                        "name": "Limits of analytical proxies",
                                        "description": "Acidity and chloride results need interpretation when other acids, salts or additives may be present.",
                                        "questions": [
                                            {
                                                "text": "Does the analytical method distinguish hydrogen chloride content from total acidity or total chloride?",
                                                "kind": "measurement",
                                                "id": "proxy-limitations-q01"
                                            },
                                            {
                                                "text": "Which sample preparation, interfering constituents or measurement limitations affect confidence in the reported result?",
                                                "kind": "boundary",
                                                "id": "proxy-limitations-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "grade-and-material-condition",
                        "name": "Grade and material condition",
                        "description": "Assess purity claims and whether the current material still matches its documented composition.",
                        "rationale": "Hydrochloric acid of the correct nominal concentration may still be unsuitable because of impurities, additives or changes during storage and use.",
                        "layers": [
                            {
                                "id": "grade-and-constituents",
                                "name": "Grade and constituents",
                                "description": "Link grade names to explicit limits and batch-specific evidence.",
                                "findings": [
                                    {
                                        "id": "purity-and-additive-evidence",
                                        "name": "Purity and additive evidence",
                                        "description": "The model must expose the constituents and specification limits that matter for the proposed application.",
                                        "questions": [
                                            {
                                                "text": "Which specification defines the claimed grade, including relevant impurity limits?",
                                                "kind": "provenance",
                                                "id": "purity-and-additive-evidence-q01"
                                            },
                                            {
                                                "text": "Which impurities and intentional additives were measured or declared, and which remain unassessed?",
                                                "kind": "measurement",
                                                "id": "purity-and-additive-evidence-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "condition-and-change",
                                "name": "Condition and change",
                                "description": "Relate present observations to events that could alter the acid.",
                                "findings": [
                                    {
                                        "id": "composition-drift",
                                        "name": "Composition drift",
                                        "description": "Dilution, evaporation, contamination and prior reactions can invalidate an earlier composition claim.",
                                        "questions": [
                                            {
                                                "text": "What changes in appearance, solids or analytical results have been observed since the last accepted assessment?",
                                                "kind": "measurement",
                                                "id": "composition-drift-q01"
                                            },
                                            {
                                                "text": "What storage, opening, transfer or use history could have changed hydrogen chloride content or introduced contaminants?",
                                                "kind": "provenance",
                                                "id": "composition-drift-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "reactivity-and-contact-compatibility",
                        "name": "Reactivity and contact compatibility",
                        "description": "Represent the chemical interactions that constrain contact, mixing and handling decisions.",
                        "rationale": "Hydrochloric acid can generate heat or hazardous gases through particular interactions, and its compatibility depends on conditions.",
                        "layers": [
                            {
                                "id": "mixing-and-reaction-partners",
                                "name": "Mixing and reaction partners",
                                "description": "Identify proposed interactions requiring a specific hazard assessment.",
                                "findings": [
                                    {
                                        "id": "reaction-specific-action-boundaries",
                                        "name": "Reaction-specific action boundaries",
                                        "description": "The agent must account for heat during dilution or neutralisation, potential hydrogen generation with susceptible metals and potential chlorine generation with hypochlorites.",
                                        "questions": [
                                            {
                                                "text": "Which proposed contact or mixing partners introduce heat, gas evolution or other hazardous reaction concerns?",
                                                "kind": "boundary",
                                                "id": "reaction-specific-action-boundaries-q01"
                                            },
                                            {
                                                "text": "What material-specific assessment and authorised procedure are required before the proposed interaction may proceed?",
                                                "kind": "action",
                                                "id": "reaction-specific-action-boundaries-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "wetted-materials-and-vapour",
                                "name": "Wetted materials and vapour",
                                "description": "Assess contact surfaces and potential release behaviour under the actual conditions.",
                                "findings": [
                                    {
                                        "id": "conditional-compatibility",
                                        "name": "Conditional compatibility",
                                        "description": "A compatibility claim must address the actual contacting material, acid composition and exposure conditions.",
                                        "questions": [
                                            {
                                                "text": "What evidence supports compatibility of the proposed contacting materials at this concentration, temperature and duration?",
                                                "kind": "provenance",
                                                "id": "conditional-compatibility-q01"
                                            },
                                            {
                                                "text": "What assessment of hydrogen chloride vapour or acid mist release constrains the proposed handling conditions?",
                                                "kind": "boundary",
                                                "id": "conditional-compatibility-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "use-suitability-and-disposition",
                        "name": "Use suitability and disposition",
                        "description": "Translate identity, composition and compatibility evidence into a bounded material-use decision.",
                        "rationale": "Recognising hydrochloric acid does not establish that a particular batch is suitable for a particular application.",
                        "layers": [
                            {
                                "id": "application-requirements",
                                "name": "Application requirements",
                                "description": "Compare the actual material with the chemical requirements of its intended use.",
                                "findings": [
                                    {
                                        "id": "application-specific-fit",
                                        "name": "Application-specific fit",
                                        "description": "Suitability must reference acceptable concentration, impurity limits and additive restrictions for an identified application.",
                                        "questions": [
                                            {
                                                "text": "What concentration range, impurity limits and additive restrictions apply to the intended use?",
                                                "kind": "boundary",
                                                "id": "application-specific-fit-q01"
                                            },
                                            {
                                                "text": "Does current batch evidence satisfy those requirements, and which gaps prevent a supported decision?",
                                                "kind": "action",
                                                "id": "application-specific-fit-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "release-and-reassessment",
                                "name": "Release and reassessment",
                                "description": "Record a use decision and the events that invalidate it.",
                                "findings": [
                                    {
                                        "id": "bounded-material-disposition",
                                        "name": "Bounded material disposition",
                                        "description": "Approval applies to a stated material condition and use; unresolved identity or composition requires an explicit restriction.",
                                        "questions": [
                                            {
                                                "text": "Is this material supported for the stated use, restricted, quarantined or rejected, and what evidence supports that disposition?",
                                                "kind": "action",
                                                "id": "bounded-material-disposition-q01"
                                            },
                                            {
                                                "text": "Which events, such as dilution, contamination, return from a process or changed contact conditions, require reassessment?",
                                                "kind": "boundary",
                                                "id": "bounded-material-disposition-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-kinds",
                                        "name": "Kinds and varieties",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            "technical/industrial grade",
                                            "reagent/ACS grade",
                                            "food-grade (E507)",
                                            "pharmaceutical/USP grade",
                                            "muriatic acid (trade name for dilute industrial HCl)",
                                            "fuming/concentrated (~37% w/w)",
                                            "dilute process acid",
                                            "hydrogen chloride gas (anhydrous HCl, neighbouring substance)"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-kinds-q01",
                                                "text": "Which of these kinds and varieties hold for the sense of hydrochloric acid this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-identifiers",
                                        "name": "Identifiers and schemes",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            {
                                                "scheme": "CAS",
                                                "value_or_pattern": "7647-01-0",
                                                "note": "Hydrogen chloride / hydrochloric acid"
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-identifiers-q01",
                                                "text": "Which of these identifiers and schemes hold for the sense of hydrochloric acid this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-standards-and-regulation",
                                        "name": "Standards and regulation",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            "UN 1789 (hydrochloric acid solution)"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-standards-and-regulation-q01",
                                                "text": "Which of these standards and regulation hold for the sense of hydrochloric acid this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-real-world-use",
                                        "name": "Real-world use",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            "Steel pickling",
                                            "pH control",
                                            "chemical synthesis"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-real-world-use-q01",
                                                "text": "Which of these real-world use hold for the sense of hydrochloric acid this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-measurements",
                                        "name": "Typical measurements",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            {
                                                "quantity": "concentration",
                                                "typical_range": "10-38",
                                                "unit": "% w/w"
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-measurements-q01",
                                                "text": "Which of these typical measurements hold for the sense of hydrochloric acid this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-failure-modes-and-hazards",
                                        "name": "Failure modes and hazards",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            "Corrosive burns",
                                            "HCl vapour inhalation"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-failure-modes-and-hazards-q01",
                                                "text": "Which of these failure modes and hazards hold for the sense of hydrochloric acid this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-regional-variation",
                                        "name": "Regional variation",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            "Muriatic acid in North America for pool/masonry use"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-regional-variation-q01",
                                                "text": "Which of these regional variation hold for the sense of hydrochloric acid this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-neighbours",
                                        "name": "Neighbouring kinds and how to tell them apart",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            {
                                                "name": "sulfuric acid",
                                                "difference": "HCl is a volatile hydrogen halide; H2SO4 is non-volatile and dehydrating"
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-neighbours-q01",
                                                "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of hydrochloric acid this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "openQuestions": [
                "What registry boundary should separate additive-containing hydrochloric acid products and spent acid liquors from independently modelled mixtures?",
                "Which authoritative grade specifications and impurity limits should be supported for the intended applications?",
                "Which analytical methods reliably establish hydrogen chloride content across the concentrations and interfering constituents this model must cover?",
                "Which validated sources provide applicable physical-property, vapour-behaviour and contact-material compatibility data, and what are their limits?",
                "What evidence and reassessment criteria are required to retain a use disposition after prolonged storage, opening or transfer?"
            ],
            "statistics": {
                "bundles": 6,
                "layers": 11,
                "findings": 18,
                "questions": 28
            }
        },
        "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 hydrochloric acid, record what state it is in, and decide what may be done with it.",
            "whatItIs": "Enable an AI agent to recognise an aqueous hydrochloric acid material, assess its composition and condition, and determine which uses, transfers or restrictions are justified by the available evidence.",
            "characteristics": {
                "substance": "material",
                "origin": "natural",
                "agency": "inert",
                "mobility": "varies"
            },
            "whatYouCanDoWithIt": [
                "observed and measured",
                "consumed or used up"
            ],
            "distinguishingFeatures": [
                "Described in 94 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 hydrochloric acid, 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": [],
            "standing": "Described in 94 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is.",
            "structure": {
                "bundles": [
                    {
                        "id": "identity-and-classification",
                        "name": "Identity, naming and classification",
                        "description": "How an agent tells one hydrochloric acid from another, and a hydrochloric acid 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 hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid from the things most often confused with it.",
                                        "questions": [
                                            {
                                                "id": "distinguishing-features-q01",
                                                "text": "What identifies and describes what distinguishes a hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid is built from and which parts are replaceable.",
                                        "questions": [
                                            {
                                                "id": "parts-and-materials-q01",
                                                "text": "What identifies and describes the composition of a hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid is judged and by whom.",
                                        "questions": [
                                            {
                                                "id": "condition-assessment-q01",
                                                "text": "What identifies and describes the condition of a hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid is, and what that position is measured against.",
                                        "questions": [
                                            {
                                                "id": "position-and-frame-q01",
                                                "text": "What identifies and describes the location of a hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid between them.",
                                        "questions": [
                                            {
                                                "id": "stages-and-transitions-q01",
                                                "text": "What identifies and describes the lifecycle of a hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid, how often and by whom.",
                                "findings": [
                                    {
                                        "id": "observation-record",
                                        "name": "Observation record",
                                        "description": "How an observation of a hydrochloric acid 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 hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid is for, and what it is used for anyway.",
                                "findings": [
                                    {
                                        "id": "function-and-purpose",
                                        "name": "Function, purpose and misuse",
                                        "description": "The function a hydrochloric acid performs and the uses that fall outside it.",
                                        "questions": [
                                            {
                                                "id": "function-and-purpose-q01",
                                                "text": "What identifies and describes the use of a hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid.",
                                "findings": [
                                    {
                                        "id": "procedures-and-skills",
                                        "name": "Procedures, skills and required tools",
                                        "description": "What an agent needs before it can act on a hydrochloric acid at all.",
                                        "questions": [
                                            {
                                                "id": "procedures-and-skills-q01",
                                                "text": "What identifies and describes handling a hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid there is and how fast it goes.",
                                        "questions": [
                                            {
                                                "id": "consumption-and-stock-q01",
                                                "text": "What identifies and describes the supply of a hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid and how confident it is.",
                                        "questions": [
                                            {
                                                "id": "claim-provenance-q01",
                                                "text": "What identifies and describes a claim about a hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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 hydrochloric acid is retired without being erased.",
                                        "questions": [
                                            {
                                                "id": "validity-and-supersession-q01",
                                                "text": "What identifies and describes the validity of a claim about a hydrochloric acid, 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 hydrochloric acid, 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 hydrochloric acid 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
            }
        }
    }
}