{ "model": { "rank": 3525, "code": "thing-q48318", "model_id": "vr.tr.urea", "name": "urea", "purpose": "Enable an AI agent to identify urea, assess the condition and suitability of a particular material, and determine which handling, storage or use decisions its evidence supports.", "family": "Thing Registry", "category": "Physical world and living systems", "status": "research-draft", "kind": "thing", "plane": "PHY", "domain": "PHY.MAT", "industry": "", "version": "", "url": "/models/thing/q48318/", "tier": 2, "score": 85, "payload": { "layer": "wikidata", "aliases": [ "urea c-13", "Urea-15N2", "(¹³C,¹⁵N₂)Carbamimidic acid" ], "aliasCount": 3, "merged": 3, "knownIn": 85, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": "vr.tr.urea", "source": { "dataset": "wikidata", "item": "Q48318", "url": "https://www.wikidata.org/wiki/Q48318", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-07T14:28:18Z", "providers": [ "Codex" ], "breadth": "recalled by Codex without web access - no source was read", "missingProviders": [], "pass": 2, "cost": { "grok": { "seconds": 26.3, "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.3\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a07c43-b650-7711-a949-467f2c673c54\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: urea\nSense to describe: (none recorded)\nDomain code: PHY.MAT\nAlso known as: (none)\n\n\nContext for this batch of 1001 things:\n# Batch 004: 1001 registered", "usd": 0, "recall": true }, "codex": { "seconds": 91.4, "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: 01a07c43-b63e-7c73-82bf-a0877f652e00\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: urea\nRegistry id: vr.tr.urea\nPlane / domain: PHY / PHY.MAT\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\n\nContext for th" } } }, "metaModel": { "id": "THING-Q48318", "registryId": "vr.tr.urea", "name": "urea", "version": "0.1.0-research.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.MAT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q48318/", "model": { "registry_id": "vr.tr.urea", "name": "urea", "purpose": "Enable an AI agent to identify urea, assess the condition and suitability of a particular material, and determine which handling, storage or use decisions its evidence supports.", "definition": "Urea, also called carbamide, is the organic compound CO(NH₂)₂, a water-soluble crystalline diamide of carbonic acid that serves as a major nitrogen-excretion product in mammals and a widely used industrial source of nitrogen.", "scope_statement": "This model owns urea as the chemical substance CO(NH2)2 and the composition, grade, physical condition, transformation risks and use constraints of identifiable urea material; it relates to solutions, formulated products, biological systems and manufacturing processes without owning those models.", "in_scope": [ "Chemical identity and distinctions from similarly named or functionally related substances", "Urea assay, moisture, impurities, grade and batch-specific evidence", "Solid form, dissolution behaviour and physical properties under stated conditions", "Changes during storage, heating and contact with water or biological activity", "Evidence supporting handling precautions and suitability for a specified use", "Substance-level environmental fate and release characteristics" ], "out_of_scope": [ "Complete formulations of fertilisers, cosmetics, medicines and diesel exhaust fluid", "Industrial synthesis plants, process design and manufacturing operations", "Whole-organism nitrogen metabolism, diagnosis and treatment", "Crop nutrient programmes and field application prescriptions", "Exhaust treatment equipment and emission-control operation", "Downstream substances such as urea-formaldehyde resins" ], "distinguishing_features": [ "Require chemical identity consistent with CO(NH2)2; nitrogen content or appearance alone cannot distinguish urea from other nitrogen-containing materials.", "Distinguish urea from uric acid and thiourea through molecular identity and analytical evidence rather than similarity of names.", "Distinguish urea itself from a urea solution or formulated product by recording water, additives and the basis of the reported composition.", "Distinguish chemical identity from grade: material identified as urea is not automatically suitable for automotive, pharmaceutical, cosmetic or fertiliser use.", "Distinguish free urea from chemically incorporated urea-derived groups in resins and other reaction products." ], "characteristics": [ { "name": "Chemical identity", "kind": "category", "unit_or_values": "Molecular formula CO(NH2)2; verified substance identifiers and identity-test results", "why_it_matters": "Prevents confusion with related names, mixtures and downstream reaction products." }, { "name": "Urea assay", "kind": "measurement", "unit_or_values": "Mass fraction in %; specify as-received or dry basis and analytical method", "why_it_matters": "Establishes how much urea is present and whether comparisons between batches are meaningful." }, { "name": "Water content", "kind": "measurement", "unit_or_values": "Mass fraction in % or mg/kg, with method and sampling conditions", "why_it_matters": "Affects assay interpretation, storage behaviour and fitness for moisture-sensitive uses." }, { "name": "Impurity and additive profile", "kind": "measurement", "unit_or_values": "Biuret, ammonia or ammonium, insoluble matter, relevant trace contaminants and declared additives in mg/kg or mass %", "why_it_matters": "Different uses tolerate different impurity profiles, and deliberate additives must be distinguished from contamination." }, { "name": "Declared grade and conformity", "kind": "relation", "unit_or_values": "Named grade linked to specification edition, supplier declaration, certificate of analysis and batch", "why_it_matters": "Connects a suitability claim to requirements and evidence rather than relying on a marketing label." }, { "name": "Physical presentation", "kind": "category", "unit_or_values": "Crystals, powder, prills or granules; coatings and other presentations explicitly described", "why_it_matters": "Influences sampling, dust generation, flow, dissolution and handling." }, { "name": "Particle size and flow condition", "kind": "measurement", "unit_or_values": "Particle-size distribution in µm or mm; fines fraction in %; named flowability or caking test", "why_it_matters": "Supports decisions about conveying, dosing, segregation and whether stored material remains usable." }, { "name": "Condition-dependent physical properties", "kind": "measurement", "unit_or_values": "Temperature in °C or K, pressure in kPa, solubility with explicit concentration basis, and thermal events with method", "why_it_matters": "Prevents a value measured under one set of conditions from being treated as an unconditional constant." }, { "name": "Storage and transformation state", "kind": "state", "unit_or_values": "Documented observations and tests for wetting, caking, contamination, ammonia formation or thermal alteration", "why_it_matters": "Separates changes in handling quality from chemical changes that may invalidate an assay or grade claim." }, { "name": "Applicable hazard and exposure record", "kind": "relation", "unit_or_values": "Jurisdiction, classification system, safety-data-sheet revision and applicable exposure limits with units and averaging periods", "why_it_matters": "Makes precautions traceable to the actual material, exposure route and governing context." } ], "affordances": [ "Verify a material's identity as urea and flag insufficient or conflicting identification evidence.", "Compare a batch's assay and impurity profile with the requirements of a specified use.", "Determine whether sampling, retesting or segregation is needed after wetting, caking, contamination or heating.", "Assess whether a proposed storage or handling condition is supported by substance and batch evidence.", "Calculate urea content in a linked mixture when composition and concentration basis are known.", "Identify release or disposal questions requiring environmental or jurisdiction-specific assessment." ] }, "sources": [], "structure": { "bundles": [ { "id": "urea-identity-and-boundaries", "name": "Urea identity and boundaries", "description": "Establishes which chemical entity is meant and where a urea material becomes a mixture or downstream product.", "rationale": "The name urea appears across chemicals, biological measurements and formulated products, so recognition must precede suitability decisions.", "layers": [ { "id": "molecular-and-registry-identity", "name": "Molecular and registry identity", "description": "Connects the registry entry to verified chemical identifiers and discriminating evidence.", "findings": [ { "id": "confirm-urea-identity", "name": "Confirm urea identity", "description": "Record evidence that identifies CO(NH2)2 rather than a similarly named substance or an unspecified nitrogen source.", "questions": [ { "text": "Which authoritative records establish the CAS number, PubChem CID, EC number and accepted synonyms for this urea identity?", "kind": "definition", "id": "confirm-urea-identity-q01" }, { "text": "Which identity test or supplier evidence distinguishes the material from uric acid, thiourea and other nitrogen-containing substances?", "kind": "provenance", "id": "confirm-urea-identity-q02" } ] } ] }, { "id": "substance-versus-containing-material", "name": "Substance versus containing material", "description": "Separates urea from solutions, coated preparations and materials containing chemically transformed urea.", "findings": [ { "id": "locate-the-material-boundary", "name": "Locate the material boundary", "description": "Identify whether the record concerns urea itself, a mixture containing free urea or a product made through its reaction.", "questions": [ { "text": "Does this record describe urea material, a specified aqueous solution, a coated fertiliser or another formulation requiring its own model?", "kind": "boundary", "id": "locate-the-material-boundary-q01" }, { "text": "Is the reported urea present as free CO(NH2)2, or does the name refer to chemically incorporated groups in a downstream material?", "kind": "definition", "id": "locate-the-material-boundary-q02" } ] } ] } ] }, { "id": "urea-composition-and-grade", "name": "Urea composition and grade", "description": "Captures actual urea content, contaminants, additives and the evidence behind a grade claim.", "rationale": "Materials with the same chemical identity can have materially different suitability because of moisture, biuret, trace contaminants or additives.", "layers": [ { "id": "assay-and-composition", "name": "Assay and composition", "description": "Makes concentration and impurity measurements interpretable and comparable.", "findings": [ { "id": "establish-assay-basis", "name": "Establish assay basis", "description": "Require the analytical basis and relevant non-urea constituents alongside any purity figure.", "questions": [ { "text": "What are the measured urea assay and water content, and are results expressed on an as-received or dry basis?", "kind": "measurement", "id": "establish-assay-basis-q01" }, { "text": "What methods and detection limits support reported biuret, ammonia or ammonium, insoluble matter and use-relevant trace contaminants?", "kind": "measurement", "id": "establish-assay-basis-q02" }, { "text": "Which coatings, anticaking agents or other additives are intentionally present?", "kind": "provenance", "id": "establish-assay-basis-q03" } ] } ] }, { "id": "grade-and-batch-evidence", "name": "Grade and batch evidence", "description": "Tests declared grade against a named specification and representative batch evidence.", "findings": [ { "id": "substantiate-grade-claims", "name": "Substantiate grade claims", "description": "Treat grade as an evidenced relationship to requirements rather than a consequence of the name urea.", "questions": [ { "text": "Which specification and edition define the claimed fertiliser, technical, automotive, pharmaceutical or other grade?", "kind": "provenance", "id": "substantiate-grade-claims-q01" }, { "text": "Does the certificate of analysis cover this batch and every requirement relevant to the intended use?", "kind": "action", "id": "substantiate-grade-claims-q02" }, { "text": "What sampling evidence addresses segregation, surface treatment or contamination within the batch?", "kind": "provenance", "id": "substantiate-grade-claims-q03" } ] } ] } ] }, { "id": "urea-physical-state-and-handling", "name": "Urea physical state and handling", "description": "Describes solid presentation, moisture-related condition and behaviour when dissolved or heated.", "rationale": "An agent must distinguish usable composition from usable physical condition and interpret property values under their actual conditions.", "layers": [ { "id": "particles-and-storage-condition", "name": "Particles and storage condition", "description": "Records properties governing bulk handling and changes during storage.", "findings": [ { "id": "assess-solid-usability", "name": "Assess solid usability", "description": "Evaluate particle presentation, fines, wetting and caking against the intended handling operation.", "questions": [ { "text": "Is the urea supplied as crystals, powder, prills or granules, and what particle-size distribution and fines content are measured?", "kind": "measurement", "id": "assess-solid-usability-q01" }, { "text": "What humidity, temperature, packaging and storage history accompany observed wetting or caking?", "kind": "provenance", "id": "assess-solid-usability-q02" }, { "text": "Does the present flow and particle condition permit the proposed conveying or dosing operation?", "kind": "action", "id": "assess-solid-usability-q03" } ] } ] }, { "id": "dissolution-and-thermal-properties", "name": "Dissolution and thermal properties", "description": "Qualifies dissolution and thermal observations by composition, temperature, pressure and method.", "findings": [ { "id": "qualify-physical-property-values", "name": "Qualify physical property values", "description": "Keep equilibrium properties, rates and decomposition observations distinct.", "questions": [ { "text": "What water solubility and dissolution behaviour are supported at the proposed temperature, particle size and concentration basis?", "kind": "measurement", "id": "qualify-physical-property-values-q01" }, { "text": "Which reported thermal events represent melting or decomposition, and under what pressure and measurement conditions?", "kind": "measurement", "id": "qualify-physical-property-values-q02" }, { "text": "Is a reported boiling point experimentally meaningful for unchanged urea, or should that field be qualified because of decomposition?", "kind": "boundary", "id": "qualify-physical-property-values-q03" } ] } ] } ] }, { "id": "urea-transformation-and-exposure", "name": "Urea transformation and exposure", "description": "Connects potential chemical changes with handling conditions and exposure assessment.", "rationale": "Precautions must account for dust and condition-dependent transformation products as well as the original substance.", "layers": [ { "id": "hydrolysis-and-thermal-change", "name": "Hydrolysis and thermal change", "description": "Investigates chemical alteration under wet, biologically active or heated conditions.", "findings": [ { "id": "assess-transformation-evidence", "name": "Assess transformation evidence", "description": "Determine whether the material remains within its declared composition after relevant exposure histories.", "questions": [ { "text": "Under the actual water, temperature, pH and urease-exposure conditions, what evidence supports hydrolysis and ammonia formation?", "kind": "measurement", "id": "assess-transformation-evidence-q01" }, { "text": "Has heating altered the assay or produced biuret or other transformation products requiring analysis?", "kind": "measurement", "id": "assess-transformation-evidence-q02" }, { "text": "Which observations or test results require retesting or segregation before continued use?", "kind": "action", "id": "assess-transformation-evidence-q03" } ] } ] }, { "id": "classification-and-exposure-controls", "name": "Classification and exposure controls", "description": "Links applicable classifications and exposure evidence to the material and proposed operation.", "findings": [ { "id": "derive-supported-precautions", "name": "Derive supported precautions", "description": "Establish precautions using current evidence for the supplied urea, its physical form and credible transformation products.", "questions": [ { "text": "What GHS classification and safety-data-sheet revision apply to this material in the relevant jurisdiction?", "kind": "provenance", "id": "derive-supported-precautions-q01" }, { "text": "Which exposure limits apply to urea dust or credible airborne transformation products, with what units and averaging periods?", "kind": "measurement", "id": "derive-supported-precautions-q02" }, { "text": "What ventilation, containment and protective measures are supported for the proposed dust-generating, dissolving or heating operation?", "kind": "action", "id": "derive-supported-precautions-q03" } ] } ] } ] }, { "id": "urea-use-and-environmental-fate", "name": "Urea use and environmental fate", "description": "Connects material evidence to use eligibility and evaluates the substance-level consequences of release.", "rationale": "Urea's roles as a nitrogen source and formulation ingredient create different quality requirements and environmental questions.", "layers": [ { "id": "intended-use-eligibility", "name": "Intended-use eligibility", "description": "Determines whether this particular material supports a specified use without owning the wider application.", "findings": [ { "id": "match-material-to-use", "name": "Match material to use", "description": "Compare composition, condition and conformity evidence with the requirements supplied by the application model.", "questions": [ { "text": "Which assay, biuret, trace-contaminant and additive requirements does the intended application impose on its urea input?", "kind": "boundary", "id": "match-material-to-use-q01" }, { "text": "Does this batch meet those requirements, and which missing results prevent a suitability decision?", "kind": "action", "id": "match-material-to-use-q02" }, { "text": "Which additional requirements belong to the finished solution, formulation or equipment system rather than to urea itself?", "kind": "boundary", "id": "match-material-to-use-q03" } ] } ] }, { "id": "release-and-nitrogen-fate", "name": "Release and nitrogen fate", "description": "Records release quantities and condition-dependent nitrogen transformations while linking to receiving-environment models.", "findings": [ { "id": "evaluate-release-context", "name": "Evaluate release context", "description": "Support release assessment with measured amounts, environmental conditions and evidence about transformation pathways.", "questions": [ { "text": "What mass of urea and corresponding nitrogen entered soil, water or a waste stream, and how was that quantity established?", "kind": "measurement", "id": "evaluate-release-context-q01" }, { "text": "What evidence describes hydrolysis, subsequent nitrogen transformations and ammonia loss under the receiving conditions?", "kind": "provenance", "id": "evaluate-release-context-q02" }, { "text": "Which recovery or disposal options are supported by the contamination profile and applicable local requirements?", "kind": "action", "id": "evaluate-release-context-q03" } ] } ] } ] }, { "id": "evidence-and-external-alignment", "name": "Evidence and external alignment", "description": "What the world already says about this thing, gathered so the model can be checked against it.", "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.", "layers": [ { "id": "reported-evidence", "name": "Reported evidence", "description": "Findings from the breadth pass, kept separate from the structural claims.", "findings": [ { "id": "evidence-confidence-notes", "name": "Check these first", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "This describes the parent compound and common commercial grades from recall; no sources were consulted.", "Verify current jurisdiction-specific GHS classifications, exposure limits and regulatory obligations before adding precise hazard or compliance claims.", "Check grade-specific purity, biuret, moisture and trace-contaminant limits against the applicable specification; fertilizer grade does not establish suitability for pharmaceutical or automotive use." ], "questions": [ { "id": "evidence-confidence-notes-q01", "text": "Which of these check these first hold for the sense of urea 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": [ "Fertilizer-grade urea", "Technical-grade urea", "Pharmaceutical-grade urea", "Reagent-grade urea", "Prilled urea", "Granular urea" ], "questions": [ { "id": "evidence-kinds-q01", "text": "Which of these kinds and varieties hold for the sense of urea 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": "CAS Registry Number", "value_or_pattern": "57-13-6", "note": "Identifies urea as a chemical substance, not a particular grade or formulation." }, { "scheme": "PubChem CID", "value_or_pattern": "1176", "note": "Compound identifier for urea." }, { "scheme": "EC number", "value_or_pattern": "200-315-5", "note": "European inventory identifier for urea." }, { "scheme": "Molecular formula", "value_or_pattern": "CH4N2O", "note": "Commonly written CO(NH2)2 to show its functional structure." } ], "questions": [ { "id": "evidence-identifiers-q01", "text": "Which of these identifiers and schemes hold for the sense of urea this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-standards-and-regulation", "name": "Standards and regulation", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "ISO 22241, issued by ISO, specifies quality and related requirements for AUS 32 aqueous urea used in diesel-engine nitrogen-oxide reduction; it concerns the formulated solution rather than every urea grade.", "The United States Pharmacopeia-National Formulary, published by the United States Pharmacopeial Convention, includes a Urea monograph for pharmaceutical quality.", "European Union REACH and CLP regulations govern applicable chemical registration, classification, labelling and supply obligations." ], "questions": [ { "id": "evidence-standards-and-regulation-q01", "text": "Which of these standards and regulation hold for the sense of urea 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": [ "Nitrogen fertilizer applied directly or incorporated into fertilizer blends.", "Feedstock for urea-formaldehyde resins used in adhesives and manufactured wood products.", "Source of ammonia in selective catalytic reduction systems for controlling nitrogen-oxide emissions.", "Ingredient in topical moisturizing and keratolytic formulations.", "Protein denaturant in laboratory solutions." ], "questions": [ { "id": "evidence-real-world-use-q01", "text": "Which of these real-world use hold for the sense of urea 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": "Molar mass", "typical_range": "60.06", "unit": "g/mol" }, { "quantity": "Melting temperature with decomposition", "typical_range": "Approximately 133-135", "unit": "°C" }, { "quantity": "Solid density near room temperature", "typical_range": "Approximately 1.32", "unit": "g/cm³" }, { "quantity": "Theoretical nitrogen mass fraction in pure urea", "typical_range": "Approximately 46.65", "unit": "%" }, { "quantity": "Common fertilizer-grade nitrogen content", "typical_range": "Approximately 46", "unit": "% by mass" } ], "questions": [ { "id": "evidence-measurements-q01", "text": "Which of these typical measurements hold for the sense of urea 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": [ "Dust can irritate eyes and respiratory passages.", "Heating causes decomposition rather than a useful normal boiling transition and can release ammonia and other decomposition products.", "Moisture uptake can cause caking and impair storage, handling and uniform fertilizer application.", "Biuret contamination can injure sensitive crops, particularly in foliar applications.", "Poorly managed fertilizer application can cause ammonia losses, nitrate leaching and nitrous-oxide emissions following transformations in soil." ], "questions": [ { "id": "evidence-failure-modes-and-hazards-q01", "text": "Which of these failure modes and hazards hold for the sense of urea 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": [ "Automotive aqueous urea is commonly marketed as DEF in North America and AdBlue in Europe; these are solution products rather than alternative chemical identities.", "Fertilizer specifications, labelling obligations and permitted agricultural uses vary by jurisdiction.", "Pharmaceutical acceptability depends on the applicable pharmacopoeia and product requirements." ], "questions": [ { "id": "evidence-regional-variation-q01", "text": "Which of these regional variation hold for the sense of urea 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": "Urine", "difference": "Urine is a biological mixture containing urea, water, salts and other metabolites; urea is one defined compound." }, { "name": "Uric acid", "difference": "Uric acid is a distinct nitrogen-containing compound associated with purine metabolism, with different structure and solubility." }, { "name": "Thiourea", "difference": "Thiourea has sulfur in place of urea's carbonyl oxygen and has different chemical and toxicological properties." }, { "name": "Biuret", "difference": "Biuret is a distinct condensation product that can form when urea is heated and can occur as an impurity." }, { "name": "Diesel exhaust fluid", "difference": "Diesel exhaust fluid is a controlled aqueous formulation typically containing 32.5% urea by mass, rather than pure urea." } ], "questions": [ { "id": "evidence-neighbours-q01", "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of urea this model covers, and on what evidence?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Which authoritative identity records should anchor the CAS, PubChem and EC identifiers, and does an existing Vercy model already own this chemical concept?", "Which current specifications define the relevant urea grades, including their assay, biuret, trace-contaminant and additive limits?", "Which sources provide reliable condition-qualified solubility, melting and decomposition data, and how should an inapplicable or unsupported boiling point be represented?", "Which jurisdiction-specific hazard classifications and occupational exposure limits apply to the intended material and operations?", "What evidence establishes storage deterioration, hydrolysis and environmental transformation behaviour under the conditions relevant to actual users?" ], "statistics": { "bundles": 6, "layers": 11, "findings": 19, "questions": 37 } }, "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 urea, record what state it is in, and decide what may be done with it.", "whatItIs": "Enable an AI agent to identify urea, assess the condition and suitability of a particular material, and determine which handling, storage or use decisions its evidence supports.", "characteristics": { "substance": "material", "origin": "natural", "agency": "inert", "mobility": "varies" }, "whatYouCanDoWithIt": [ "observed and measured", "consumed or used up" ], "distinguishingFeatures": [ "Names folded into this entry, which a task may need to split apart again: urea c-13, Urea-15N2, (¹³C,¹⁵N₂)Carbamimidic acid.", "3 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 85 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 urea, and on what evidence are they told apart?" ], "whatItIsMadeOf": "matter you can touch", "physicalCharacter": [ "Mobility varies between examples.", "Does nothing on its own; everything it does, something else did to it.", "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing." ], "whatCanBeDoneWithIt": [ "observe it, measure it, record its state", "use it up, and then need more of it" ], "howItIsRecognised": [ "Not recognisable by sight in any reliable way. Appearance varies with grade, form and additives; identification is by label, by documentation, or by assay." ], "relatedModels": [ { "relation": "covers", "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.", "targets": [ "urea c-13", "Urea-15N2", "(¹³C,¹⁵N₂)Carbamimidic acid" ] } ], "standing": "Described in 85 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 3 finer distinctions are held inside this entry as names rather than as separate models.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one urea from another, and a urea 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 urea, 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 urea, 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 urea 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 urea, 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 urea, 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 urea 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 urea 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 urea, 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 urea, 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 urea 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 urea from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a urea, 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 urea, 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 urea 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 urea 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 urea, 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 urea, 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 urea 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 urea is built from and which parts are replaceable.", "questions": [ { "id": "parts-and-materials-q01", "text": "What identifies and describes the composition of a urea, 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 urea, 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 urea 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 urea is judged and by whom.", "questions": [ { "id": "condition-assessment-q01", "text": "What identifies and describes the condition of a urea, 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 urea, 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 urea 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 urea 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 urea is, and what that position is measured against.", "questions": [ { "id": "position-and-frame-q01", "text": "What identifies and describes the location of a urea, 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 urea, 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 urea 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 urea 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 urea, 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 urea, 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 urea 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 urea 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 urea between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a urea, 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 urea, 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 urea 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 urea, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a urea 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 urea, 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 urea, 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 urea 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 urea 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 urea is for, and what it is used for anyway.", "findings": [ { "id": "function-and-purpose", "name": "Function, purpose and misuse", "description": "The function a urea performs and the uses that fall outside it.", "questions": [ { "id": "function-and-purpose-q01", "text": "What identifies and describes the use of a urea, 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 urea, 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 urea 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 urea.", "findings": [ { "id": "procedures-and-skills", "name": "Procedures, skills and required tools", "description": "What an agent needs before it can act on a urea at all.", "questions": [ { "id": "procedures-and-skills-q01", "text": "What identifies and describes handling a urea, 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 urea, 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 urea 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 urea there is and how fast it goes.", "questions": [ { "id": "consumption-and-stock-q01", "text": "What identifies and describes the supply of a urea, 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 urea, 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 urea 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 urea 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 urea 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 urea 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 urea 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 urea, 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 urea 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 urea 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 urea 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 urea, 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 urea 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 urea and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a urea, 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 urea, 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 urea 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 urea is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a urea, 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 urea, 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 urea 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 } } } }