{
    "model": {
        "rank": 6806,
        "code": "thing-q484790",
        "model_id": "vr.tr.enthalpy-of-fusion",
        "name": "enthalpy of fusion",
        "purpose": "Enable an AI agent to identify, compare, measure and apply enthalpy-of-fusion values with explicit material, phase, thermodynamic and quantity-basis constraints.",
        "family": "Thing Registry",
        "category": "Cross-cutting context",
        "status": "research-draft",
        "kind": "thing",
        "plane": "XCT",
        "domain": "XCT.QLT",
        "industry": "",
        "version": "",
        "url": "/models/thing/q484790/",
        "tier": 2,
        "score": 58,
        "payload": {
            "layer": "wikidata",
            "aliases": [],
            "aliasCount": 0,
            "merged": 0,
            "knownIn": 58,
            "facets": null,
            "markers": [],
            "lexicalClass": "",
            "senseRank": null,
            "alsoRegisteredAs": null,
            "source": {
                "dataset": "wikidata",
                "item": "Q484790",
                "url": "https://www.wikidata.org/wiki/Q484790",
                "license": "CC0 1.0"
            }
        },
        "research": {
            "vercy": "1.0-draft",
            "publication": {
                "status": "research-draft",
                "adjudicationStatus": "unreviewed",
                "publishableCanonical": false,
                "generatedAt": "2026-09-09T23:32:41Z",
                "providers": [
                    "Codex"
                ],
                "breadth": "recalled by Codex without web access - no source was read",
                "missingProviders": [],
                "pass": 2,
                "cost": {
                    "grok": {
                        "seconds": 20,
                        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a08883-5981-76e3-b08a-ece093ee4619\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: enthalpy of fusion\nSense to describe: (none recorded)\nDomain code: XCT.QLT\nAlso known as: (none)\n\n\nContext for this batch of 1001 things:\n# Batch 007: 1",
                        "usd": 0,
                        "recall": true
                    },
                    "codex": {
                        "seconds": 57.4,
                        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a08883-595b-71f2-885e-4898261c80c1\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: enthalpy of fusion\nRegistry id: vr.tr.enthalpy-of-fusion\nPlane / domain: XCT / XCT.QLT\nRegistry definition: (none recorded)\nNames folded into this en"
                    }
                }
            },
            "metaModel": {
                "id": "THING-Q484790",
                "registryId": "vr.tr.enthalpy-of-fusion",
                "name": "enthalpy of fusion",
                "version": "0.1.0-research.1",
                "entryKind": "thing",
                "family": "Thing Registry",
                "domain": [
                    "XCT.QLT"
                ],
                "status": "research-draft"
            },
            "canonicalUrl": "https://ver.cy/models/thing/q484790/",
            "model": {
                "registry_id": "vr.tr.enthalpy-of-fusion",
                "name": "enthalpy of fusion",
                "purpose": "Enable an AI agent to identify, compare, measure and apply enthalpy-of-fusion values with explicit material, phase, thermodynamic and quantity-basis constraints.",
                "definition": "Enthalpy of fusion is the enthalpy change when a specified amount of a substance changes from solid to liquid at a stated temperature and pressure, conventionally evaluated at solid-liquid equilibrium.",
                "scope_statement": "This model owns the enthalpy change associated with converting a specified solid phase into a liquid, including the conditions, amount basis, evidence and applicability of reported values; it specialises enthalpy change for fusion.",
                "in_scope": [
                    "The solid-to-liquid transition and identification of its initial and final states",
                    "Total, molar and mass-specific expressions of enthalpy of fusion",
                    "Material composition, solid form, pressure and transition temperature",
                    "Calorimetric determination and separation of fusion from other thermal contributions",
                    "Uncertainty, comparability and use in melting or solidification energy calculations"
                ],
                "out_of_scope": [
                    "General enthalpy and thermodynamic state-function theory",
                    "Enthalpies of vaporisation, sublimation, dissolution and chemical reaction",
                    "Heat capacity and sensible heating except where needed to isolate fusion",
                    "Complete phase diagrams and melting-point models",
                    "Heat-transfer equipment, melting rates and process-control models"
                ],
                "distinguishing_features": [
                    "The change connects a specified solid phase with a liquid; a solid-to-solid transition or sublimation does not qualify.",
                    "The value represents an enthalpy difference, not the temperature at which melting occurs.",
                    "The stated basis distinguishes total energy in joules from mass-specific or molar values.",
                    "Heat measured during a temperature ramp qualifies only after the fusion contribution is distinguished from sensible heating and overlapping events.",
                    "Equilibrium fusion values refer to coexisting phases at a specified pressure and melting temperature; an experimental melting interval requires additional interpretation."
                ],
                "characteristics": [
                    {
                        "name": "Material and composition",
                        "kind": "relation",
                        "unit_or_values": "Identified substance or mixture, composition, purity and relevant sample condition",
                        "why_it_matters": "A value cannot be transferred reliably between different compositions or impurity levels."
                    },
                    {
                        "name": "Initial solid and final liquid states",
                        "kind": "relation",
                        "unit_or_values": "Specified solid phase or polymorph and resulting liquid state",
                        "why_it_matters": "Different initial solid forms can have different enthalpy differences relative to the liquid."
                    },
                    {
                        "name": "Quantity basis",
                        "kind": "category",
                        "unit_or_values": "Total: J; mass-specific: J/kg; molar: J/mol",
                        "why_it_matters": "The basis determines how to compare values and scale them to a sample."
                    },
                    {
                        "name": "Enthalpy-of-fusion value",
                        "kind": "measurement",
                        "unit_or_values": "Signed value in the declared quantity basis, with uncertainty",
                        "why_it_matters": "It supplies the energy change attributable to the specified fusion transition."
                    },
                    {
                        "name": "Reference pressure",
                        "kind": "measurement",
                        "unit_or_values": "Pa",
                        "why_it_matters": "Phase coexistence conditions and the associated enthalpy difference depend on pressure."
                    },
                    {
                        "name": "Transition temperature or interval",
                        "kind": "measurement",
                        "unit_or_values": "K; identify equilibrium temperature, measured onset, peak or integration interval",
                        "why_it_matters": "These temperature descriptions are not interchangeable and affect interpretation."
                    },
                    {
                        "name": "Transition interpretation",
                        "kind": "category",
                        "unit_or_values": "Equilibrium fusion; apparent melting-event enthalpy; unresolved overlapping event",
                        "why_it_matters": "It distinguishes a thermodynamic phase-change value from a protocol-dependent thermal signal."
                    },
                    {
                        "name": "Sample phase fraction",
                        "kind": "state",
                        "unit_or_values": "Crystalline or meltable fraction from 0 to 1, or unknown, with determination method",
                        "why_it_matters": "A partly crystalline sample can yield less fusion energy per unit sample mass than a fully crystalline reference."
                    },
                    {
                        "name": "Determination method",
                        "kind": "category",
                        "unit_or_values": "Differential scanning calorimetry, other calorimetry, thermodynamic derivation or compilation",
                        "why_it_matters": "The method determines which assumptions, corrections and supporting evidence must be checked."
                    }
                ],
                "affordances": [
                    "Reject or flag values whose material, transition identity or quantity basis is ambiguous.",
                    "Convert compatible total, mass-specific and molar values using documented mass or molar mass.",
                    "Compare reported values after aligning composition, solid form, pressure and temperature conventions.",
                    "Estimate a fusion energy contribution for a specified amount and transformed fraction.",
                    "Assess whether a calorimetric peak supports a fusion value or needs separation from overlapping events.",
                    "Infer the enthalpy change for the exactly reversed transition by reversing the sign and preserving the state definitions."
                ]
            },
            "sources": [],
            "structure": {
                "bundles": [
                    {
                        "id": "fusion-transition-identity",
                        "name": "Fusion transition identity",
                        "description": "Establish which solid-to-liquid change a reported value represents.",
                        "rationale": "A thermal-event label alone cannot establish that a value belongs to fusion of the intended material and solid phase.",
                        "layers": [
                            {
                                "id": "material-and-phase-endpoints",
                                "name": "Material and phase endpoints",
                                "description": "Identify composition and the states connected by the enthalpy difference.",
                                "findings": [
                                    {
                                        "id": "specified-solid-to-liquid-change",
                                        "name": "Specified solid-to-liquid change",
                                        "description": "Recognition requires a named material and sufficiently explicit solid and liquid endpoints, including solid form where relevant.",
                                        "questions": [
                                            {
                                                "text": "Which substance or mixture, composition and initial solid phase does the fusion value describe?",
                                                "kind": "definition",
                                                "id": "specified-solid-to-liquid-change-q01"
                                            },
                                            {
                                                "text": "Does the final liquid retain the overall composition, or is melting accompanied by decomposition, segregation or another transformation?",
                                                "kind": "boundary",
                                                "id": "specified-solid-to-liquid-change-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "separation-from-adjacent-events",
                                "name": "Separation from adjacent events",
                                "description": "Distinguish fusion from other contributions to an observed thermal event.",
                                "findings": [
                                    {
                                        "id": "fusion-event-attribution",
                                        "name": "Fusion event attribution",
                                        "description": "An integrated thermal signal may include solid-state transitions, desolvation, reaction or recrystallisation and therefore needs evidence for attribution to fusion.",
                                        "questions": [
                                            {
                                                "text": "What evidence identifies the event as melting rather than a solid-state transition, dissolution or decomposition?",
                                                "kind": "boundary",
                                                "id": "fusion-event-attribution-q01"
                                            },
                                            {
                                                "text": "Which overlapping thermal events were excluded or separated before assigning an enthalpy of fusion?",
                                                "kind": "measurement",
                                                "id": "fusion-event-attribution-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "thermodynamic-value-definition",
                        "name": "Thermodynamic value definition",
                        "description": "Specify the enthalpy difference, its normalisation and the conditions under which it applies.",
                        "rationale": "Numerically similar values can describe different quantities or different thermodynamic states.",
                        "layers": [
                            {
                                "id": "basis-and-transition-direction",
                                "name": "Basis and transition direction",
                                "description": "Resolve units, amount basis and sign convention.",
                                "findings": [
                                    {
                                        "id": "normalised-enthalpy-difference",
                                        "name": "Normalised enthalpy difference",
                                        "description": "The fusion convention uses liquid enthalpy minus solid enthalpy on an explicitly stated total, mass-specific or molar basis.",
                                        "questions": [
                                            {
                                                "text": "Is the reported value total, mass-specific or molar, and what exact material amount is used for normalisation?",
                                                "kind": "definition",
                                                "id": "normalised-enthalpy-difference-q01"
                                            },
                                            {
                                                "text": "Does the reported sign describe solid-to-liquid enthalpy change, a positive latent-heat magnitude or the instrument's plotting convention?",
                                                "kind": "measurement",
                                                "id": "normalised-enthalpy-difference-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "phase-coexistence-conditions",
                                "name": "Phase coexistence conditions",
                                "description": "Locate the value at a pressure and temperature and distinguish equilibrium from experimental conditions.",
                                "findings": [
                                    {
                                        "id": "reference-state-compatibility",
                                        "name": "Reference state compatibility",
                                        "description": "An equilibrium fusion value compares coexisting solid and liquid states at the same temperature and pressure; values defined elsewhere require explicit state and correction conventions.",
                                        "questions": [
                                            {
                                                "text": "At what pressure and temperature are the solid and liquid enthalpies compared?",
                                                "kind": "measurement",
                                                "id": "reference-state-compatibility-q01"
                                            },
                                            {
                                                "text": "Does the reported temperature denote equilibrium coexistence, calorimetric onset, peak maximum or a melting interval?",
                                                "kind": "definition",
                                                "id": "reference-state-compatibility-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "calorimetric-evidence",
                        "name": "Calorimetric evidence",
                        "description": "Connect a fusion value to the measurement or derivation that supports it.",
                        "rationale": "Fusion enthalpy can be distorted by baseline selection, sample history and incomplete transformation.",
                        "layers": [
                            {
                                "id": "signal-to-fusion-energy",
                                "name": "Signal to fusion energy",
                                "description": "Document how thermal observations become an energy assigned to melting.",
                                "findings": [
                                    {
                                        "id": "calibrated-fusion-integral",
                                        "name": "Calibrated fusion integral",
                                        "description": "A calorimetric determination requires an energy calibration, integration bounds and a baseline that distinguishes the melting contribution from background heating.",
                                        "questions": [
                                            {
                                                "text": "Which method, calibration, baseline and integration bounds produced the reported fusion energy?",
                                                "kind": "measurement",
                                                "id": "calibrated-fusion-integral-q01"
                                            },
                                            {
                                                "text": "Where can the original measurement, thermogram or derivation and its experimental conditions be inspected?",
                                                "kind": "provenance",
                                                "id": "calibrated-fusion-integral-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "sample-history-and-uncertainty",
                                "name": "Sample history and uncertainty",
                                "description": "Assess how sample preparation and measurement conditions constrain the result.",
                                "findings": [
                                    {
                                        "id": "representative-transformation",
                                        "name": "Representative transformation",
                                        "description": "Purity, polymorph content, crystallinity, scan rate and thermal history can affect the observed melting event and the amount of material that contributes to it.",
                                        "questions": [
                                            {
                                                "text": "What sample history, phase fractions and heating protocol were recorded, and was melting complete within the measured interval?",
                                                "kind": "measurement",
                                                "id": "representative-transformation-q01"
                                            },
                                            {
                                                "text": "What uncertainty includes calibration, sample amount, baseline choice, repeatability and unresolved event overlap?",
                                                "kind": "measurement",
                                                "id": "representative-transformation-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "application-and-comparability",
                        "name": "Application and comparability",
                        "description": "Determine which comparisons and energy calculations a fusion value supports.",
                        "rationale": "A valid reported value can still be unsuitable for another composition, phase form or melting process.",
                        "layers": [
                            {
                                "id": "comparison-and-conversion",
                                "name": "Comparison and conversion",
                                "description": "Align values before combining, ranking or substituting them.",
                                "findings": [
                                    {
                                        "id": "compatible-fusion-values",
                                        "name": "Compatible fusion values",
                                        "description": "Unit conversion alone establishes comparability only when material, phase endpoints and thermodynamic conditions also match sufficiently for the intended use.",
                                        "questions": [
                                            {
                                                "text": "Do the candidate values concern the same composition, solid form, pressure and temperature convention?",
                                                "kind": "boundary",
                                                "id": "compatible-fusion-values-q01"
                                            },
                                            {
                                                "text": "Which documented mass, molar mass or state correction permits the required conversion, and how will its uncertainty propagate?",
                                                "kind": "action",
                                                "id": "compatible-fusion-values-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "melting-and-freezing-energy-use",
                                "name": "Melting and freezing energy use",
                                "description": "Apply the value to a defined transformed amount while respecting process boundaries.",
                                "findings": [
                                    {
                                        "id": "bounded-latent-energy-estimate",
                                        "name": "Bounded latent energy estimate",
                                        "description": "For a compatible transition, the transformed amount scales the fusion enthalpy contribution. Total process heat also depends on sensible heating and other energy terms; identifying heat with enthalpy change requires appropriate process assumptions.",
                                        "questions": [
                                            {
                                                "text": "What amount and fraction undergo the specified transition, and are composition and phase conditions sufficiently constant to use one fusion value?",
                                                "kind": "action",
                                                "id": "bounded-latent-energy-estimate-q01"
                                            },
                                            {
                                                "text": "Does the calculation seek only the phase-change contribution or total process heat, and which pressure, work and heat-loss assumptions are required?",
                                                "kind": "boundary",
                                                "id": "bounded-latent-energy-estimate-q02"
                                            },
                                            {
                                                "text": "For solidification, are the endpoints the exact reverse of the fusion reference, or do supercooling and a different final solid phase require additional information?",
                                                "kind": "action",
                                                "id": "bounded-latent-energy-estimate-q03"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "evidence-and-external-alignment",
                        "name": "Evidence and external alignment",
                        "description": "What the world already says about this thing, gathered so the model can be checked against it.",
                        "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.",
                        "layers": [
                            {
                                "id": "reported-evidence",
                                "name": "Reported evidence",
                                "description": "Findings from the breadth pass, kept separate from the structural claims.",
                                "findings": [
                                    {
                                        "id": "evidence-confidence-notes",
                                        "name": "Check these first",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "This is recalled knowledge, without source consultation.",
                                            "Check the substance, solid form, pressure, temperature and amount basis before using any tabulated value.",
                                            "Mixtures and partially crystalline materials may melt over a temperature interval; their reported melting enthalpy requires a stated measurement and integration procedure."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-confidence-notes-q01",
                                                "text": "Which of these check these first hold for the sense of enthalpy of fusion this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-kinds",
                                        "name": "Kinds and varieties",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "Molar enthalpy of fusion",
                                            "Specific enthalpy of fusion, expressed per unit mass"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-kinds-q01",
                                                "text": "Which of these kinds and varieties hold for the sense of enthalpy of fusion this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-identifiers",
                                        "name": "Identifiers and schemes",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            {
                                                "scheme": "Thermodynamic quantity notation",
                                                "value_or_pattern": "Δ_fus H; Δ_fus H_m for molar enthalpy of fusion",
                                                "note": "These are quantity symbols, not unique registry identifiers; substance, solid form, temperature and pressure must also be specified."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-identifiers-q01",
                                                "text": "Which of these identifiers and schemes hold for the sense of enthalpy of fusion this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-real-world-use",
                                        "name": "Real-world use",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "Sizing thermal energy storage systems using phase change materials.",
                                            "Calculating heat requirements for melting in casting and materials processing.",
                                            "Modelling freezing and melting in refrigeration and thermal management.",
                                            "Characterising materials using differential scanning calorimetry.",
                                            "Estimating polymer crystallinity by comparison with an appropriate fully crystalline reference."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-real-world-use-q01",
                                                "text": "Which of these real-world use hold for the sense of enthalpy of fusion this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-measurements",
                                        "name": "Typical measurements",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            {
                                                "quantity": "Specific enthalpy of fusion of ordinary ice near 0 °C at atmospheric pressure",
                                                "typical_range": "Approximately 333-334",
                                                "unit": "kJ/kg"
                                            },
                                            {
                                                "quantity": "Molar enthalpy of fusion of ordinary ice near 0 °C at atmospheric pressure",
                                                "typical_range": "Approximately 6.01",
                                                "unit": "kJ/mol"
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-measurements-q01",
                                                "text": "Which of these typical measurements hold for the sense of enthalpy of fusion this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-failure-modes-and-hazards",
                                        "name": "Failure modes and hazards",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "Confusing molar and mass-specific values produces incorrect energy balances.",
                                            "Including sensible heating, evaporation, decomposition or other transitions in a calorimetric melting peak misstates the enthalpy of fusion.",
                                            "Ignoring impurities, polymorphism or incomplete crystallinity can make reference values inappropriate for a sample.",
                                            "Poor calorimeter calibration, baseline selection or thermal equilibration can bias measured melting enthalpy.",
                                            "Underestimating latent heat requirements can lead to inadequate heating or cooling capacity."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-failure-modes-and-hazards-q01",
                                                "text": "Which of these failure modes and hazards hold for the sense of enthalpy of fusion this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-regional-variation",
                                        "name": "Regional variation",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "The quantity has no regional physical variation; reporting conventions differ, with SI units alongside legacy calorie-based or British thermal unit-based values."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-regional-variation-q01",
                                                "text": "Which of these regional variation hold for the sense of enthalpy of fusion this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-neighbours",
                                        "name": "Neighbouring kinds and how to tell them apart",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            {
                                                "name": "Latent heat of fusion",
                                                "difference": "Often denotes the same numerical quantity under constant-pressure conditions with only pressure-volume work; latent heat emphasises heat transfer and may be reported per unit mass."
                                            },
                                            {
                                                "name": "Enthalpy of vaporization",
                                                "difference": "Describes the liquid-to-gas transition rather than solid-to-liquid melting."
                                            },
                                            {
                                                "name": "Enthalpy of solidification",
                                                "difference": "Describes the reverse transition and has the opposite sign for the same states and amount of substance."
                                            },
                                            {
                                                "name": "Melting temperature",
                                                "difference": "Specifies the temperature of solid-liquid equilibrium at a given pressure, rather than the enthalpy difference between phases."
                                            },
                                            {
                                                "name": "Heat capacity",
                                                "difference": "Relates heat input to temperature change under specified conditions, rather than the enthalpy change of melting."
                                            },
                                            {
                                                "name": "Entropy of fusion",
                                                "difference": "Measures the entropy change of melting; at equilibrium, Δ_fus S = Δ_fus H / T, with T in kelvin."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-neighbours-q01",
                                                "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of enthalpy of fusion this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "openQuestions": [
                "Which authoritative terminology should govern the registry's treatment of total enthalpy of fusion, specific enthalpy of fusion, molar enthalpy of fusion and latent heat of fusion?",
                "Should mixtures with melting intervals and incongruent melting be represented directly here, or through linked phase-equilibrium models with explicitly qualified apparent enthalpies?",
                "What minimum phase-identification and crystallinity evidence should be required before treating a sample measurement as a transferable material value?",
                "Which reference conditions and correction methods should be accepted when comparing fusion values measured at different pressures or temperatures?",
                "What evidence threshold should distinguish an isolated fusion enthalpy from an unresolved calorimetric event integral?"
            ],
            "statistics": {
                "bundles": 5,
                "layers": 9,
                "findings": 16,
                "questions": 25
            }
        },
        "draft": {
            "generator": "vr.draft.v3",
            "status": "draft-generated",
            "researched": false,
            "archetype": "abstract concept",
            "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 enthalpy of fusion, record what state it is in, and decide what may be done with it.",
            "whatItIs": "Enable an AI agent to identify, compare, measure and apply enthalpy-of-fusion values with explicit material, phase, thermodynamic and quantity-basis constraints.",
            "characteristics": {
                "substance": "abstract",
                "origin": "conceptual",
                "agency": "inert"
            },
            "whatYouCanDoWithIt": [
                "observed and measured"
            ],
            "distinguishingFeatures": [
                "Described in 58 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 enthalpy of fusion, and on what evidence are they told apart?"
            ],
            "whatItIsMadeOf": "an abstraction with no physical instance",
            "physicalCharacter": [
                "Does nothing on its own; everything it does, something else did to it.",
                "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing."
            ],
            "whatCanBeDoneWithIt": [
                "observe it, measure it, record its state"
            ],
            "howItIsRecognised": [
                "Nothing to see. What is recognised is an instance of it, and which instances count is exactly what is argued about."
            ],
            "relatedModels": [],
            "standing": "Described in 58 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 enthalpy of fusion from another, and a enthalpy of fusion 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 enthalpy of fusion, 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 enthalpy of fusion, 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 enthalpy of fusion 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 enthalpy of fusion, 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 enthalpy of fusion, 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 enthalpy of fusion 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 enthalpy of fusion 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 enthalpy of fusion, 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 enthalpy of fusion, 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 enthalpy of fusion 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 enthalpy of fusion from the things most often confused with it.",
                                        "questions": [
                                            {
                                                "id": "distinguishing-features-q01",
                                                "text": "What identifies and describes what distinguishes a enthalpy of fusion, 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 enthalpy of fusion, 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 enthalpy of fusion 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 enthalpy of fusion 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 enthalpy of fusion between them.",
                                        "questions": [
                                            {
                                                "id": "stages-and-transitions-q01",
                                                "text": "What identifies and describes the lifecycle of a enthalpy of fusion, 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 enthalpy of fusion, 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 enthalpy of fusion 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 enthalpy of fusion, how often and by whom.",
                                "findings": [
                                    {
                                        "id": "observation-record",
                                        "name": "Observation record",
                                        "description": "How an observation of a enthalpy of fusion 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 enthalpy of fusion, 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 enthalpy of fusion, 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 enthalpy of fusion is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "definitions-in-contest",
                        "name": "Definitions and who holds them",
                        "description": "What enthalpy of fusion is taken to mean, and by whom.",
                        "rationale": "When a field disagrees about a concept, the disagreement is the content. A model that picks one definition silently destroys the information.",
                        "layers": [
                            {
                                "id": "competing-definitions",
                                "name": "Competing definitions",
                                "description": "The main readings and the traditions behind them.",
                                "findings": [
                                    {
                                        "id": "definition-map",
                                        "name": "Definitions and their holders",
                                        "description": "Each definition with the school or body that holds it.",
                                        "questions": [
                                            {
                                                "id": "definition-map-q01",
                                                "text": "Which definitions of enthalpy of fusion are in use, and which tradition or body holds each?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "definition-map-q02",
                                                "text": "What turns on the difference between them in practice?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "operationalisation",
                                "name": "Operationalisation",
                                "description": "How it is measured or applied when it has to be.",
                                "findings": [
                                    {
                                        "id": "operational-record",
                                        "name": "Measures and proxies",
                                        "description": "Instruments and indicators used to stand in for it.",
                                        "questions": [
                                            {
                                                "id": "operational-record-q01",
                                                "text": "How is enthalpy of fusion operationalised or measured in practice, and by what instrument?",
                                                "kind": "measurement"
                                            },
                                            {
                                                "id": "operational-record-q02",
                                                "text": "What does that operationalisation leave out, and when does that matter?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "instances-and-use",
                        "name": "Instances, use and consequence",
                        "description": "What counts as an instance of enthalpy of fusion and what follows from calling something that.",
                        "rationale": "Applying a concept is an act with consequences, so a model must say what the label licenses and what it does not.",
                        "layers": [
                            {
                                "id": "instances",
                                "name": "What counts as an instance",
                                "description": "Clear cases, borderline cases and non-cases.",
                                "findings": [
                                    {
                                        "id": "instance-tests",
                                        "name": "Tests for an instance",
                                        "description": "What would settle whether something falls under it.",
                                        "questions": [
                                            {
                                                "id": "instance-tests-q01",
                                                "text": "What would settle whether something is an instance of enthalpy of fusion?",
                                                "kind": "boundary"
                                            },
                                            {
                                                "id": "instance-tests-q02",
                                                "text": "Which borderline cases are argued about, and on what grounds?",
                                                "kind": "definition"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "consequence",
                                "name": "Consequence of application",
                                "description": "Rights, duties or decisions that follow from the label.",
                                "findings": [
                                    {
                                        "id": "consequence-record",
                                        "name": "What the label licenses",
                                        "description": "What an agent may do once something is classified this way.",
                                        "questions": [
                                            {
                                                "id": "consequence-record-q01",
                                                "text": "What follows practically once something is treated as enthalpy of fusion?",
                                                "kind": "action"
                                            },
                                            {
                                                "id": "consequence-record-q02",
                                                "text": "What must an agent not infer from the label alone?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "provenance-and-evidence",
                        "name": "Provenance, evidence and time",
                        "description": "Where every claim about a enthalpy of fusion 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 enthalpy of fusion and how confident it is.",
                                        "questions": [
                                            {
                                                "id": "claim-provenance-q01",
                                                "text": "What identifies and describes a claim about a enthalpy of fusion, 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 enthalpy of fusion, 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 enthalpy of fusion 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 enthalpy of fusion is retired without being erased.",
                                        "questions": [
                                            {
                                                "id": "validity-and-supersession-q01",
                                                "text": "What identifies and describes the validity of a claim about a enthalpy of fusion, 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 enthalpy of fusion, 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 enthalpy of fusion is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "statistics": {
                "bundles": 5,
                "layers": 10,
                "findings": 12,
                "questions": 32
            }
        }
    }
}