{ "model": { "rank": 15022, "code": "thing-q803818", "model_id": "vr.tr.bailey-bridge", "name": "Bailey bridge", "purpose": "Let an agent explain what a Bailey bridge is and how the panel system works, relay history, standard dimensions and load classes from engineering and historical sources, distinguish it from other prefabricated bridges, and relay heritage and current use information.", "family": "Thing Registry", "category": "Physical world and living systems", "status": "research-draft", "kind": "thing", "plane": "PHY", "domain": "PHY.BLT", "industry": "", "version": "", "url": "/models/thing/q803818/", "tier": 2, "score": 34, "payload": { "layer": "wikidata", "aliases": [], "aliasCount": 0, "merged": 0, "knownIn": 34, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": null, "source": { "dataset": "wikidata", "item": "Q803818", "url": "https://www.wikidata.org/wiki/Q803818", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-12T20:49:56Z", "providers": [ "Claude" ], "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify", "pass": 2, "wave": 3, "engine": "claude" }, "metaModel": { "id": "THING-Q803818", "registryId": "vr.tr.bailey-bridge", "name": "Bailey bridge", "version": "0.2.0-wave.3", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.BLT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q803818/", "model": { "registry_id": "vr.tr.bailey-bridge", "name": "Bailey bridge", "purpose": "Let an agent explain what a Bailey bridge is and how the panel system works, relay history, standard dimensions and load classes from engineering and historical sources, distinguish it from other prefabricated bridges, and relay heritage and current use information.", "definition": "A portable prefabricated truss bridge assembled from standard steel panels and transoms pinned together by hand without heavy equipment, designed by Donald Bailey for the British Army in 1940 and 1941; used throughout the Second World War and since then for military, emergency and temporary civil crossings, with modern derivatives still manufactured.", "what_it_is_for": "Rapid temporary or emergency bridging.", "affordances": [ "explain the panel system and assembly principle", "relay standard dimensions and configurations", "relay history and notable uses", "distinguish it from other modular bridges" ], "distinguishing_features": [ "Standard interchangeable panels", "Hand assembly with pins", "Configurable strength by doubling and stacking", "Launched by rollers without cranes" ], "appearance": "A steel truss bridge with a lattice of rectangular panels along each side, sometimes doubled or stacked, carrying a timber or steel deck.", "visual_identification": [ "Rectangular lattice panels pinned end to end", "Panels doubled or tripled and stacked for heavier loads", "Modern modular bridges such as the Mabey and Acrow types are derivatives; a girder bridge lacks the panels" ], "physical_properties": [ { "quantity": "panel length", "typical_range": "10", "unit": "feet", "note": "about 3.05 m" }, { "quantity": "panel height", "typical_range": "5", "unit": "feet", "note": "about 1.52 m" }, { "quantity": "spans", "typical_range": "up to about 60", "unit": "m", "note": "single span in heavy configurations" } ], "families_and_kinds": [ "original wartime Bailey bridge", "configurations by panel count such as double-double and triple-single", "pontoon and floating Bailey bridges", "modern derivatives by later manufacturers", "permanent civil installations of Bailey type" ], "related_models": [ { "relation": "is a kind of", "target": "truss bridge", "why": "a panel truss" }, { "relation": "is a kind of", "target": "prefabricated bridge", "why": "modular system" }, { "relation": "was designed by", "target": "Donald Bailey", "why": "the engineer" }, { "relation": "is used in", "target": "military engineering", "why": "its origin" } ], "identifiers": [], "standards_and_regulation": [ "Military load classification standards for temporary bridges", "National road bridge standards when used for public traffic", "Heritage protection of surviving wartime examples" ], "failure_modes_and_hazards": [ "Overloading beyond the configured class", "Corrosion and missing pins in old installations", "Assembly injuries", "Confusing derivatives with the original" ], "in_scope": [], "out_of_scope": [], "characteristics": [] }, "sources": [], "structure": { "bundles": [ { "id": "design", "name": "Design", "description": "How it works.", "rationale": "Engineering.", "layers": [ { "id": "system", "name": "System", "description": "Panel system.", "findings": [ { "id": "system-finding", "name": "System", "description": "System.", "questions": [ { "text": "How do panels, transoms, stringers and pins form the bridge, and how is strength configured?", "kind": "definition" }, { "text": "Is the bridge an original Bailey, a derivative or another modular bridge?", "kind": "boundary" } ] } ] }, { "id": "assembly", "name": "Assembly", "description": "Assembly and launching.", "findings": [ { "id": "assembly-finding", "name": "Assembly", "description": "Assembly.", "questions": [ { "text": "How is a Bailey bridge assembled and launched, in general terms?", "kind": "provenance" }, { "text": "Which entry fits bridge construction?", "kind": "action" } ] } ] } ] }, { "id": "specify", "name": "Specify", "description": "Dimensions and loads.", "rationale": "Numbers.", "layers": [ { "id": "dimensions", "name": "Dimensions", "description": "Dimensions.", "findings": [ { "id": "dimensions-finding", "name": "Dimensions", "description": "Dimensions.", "questions": [ { "text": "What are the standard dimensions and spans of the system?", "kind": "measurement" }, { "text": "Which source gives them?", "kind": "provenance" } ] } ] }, { "id": "loads", "name": "Loads", "description": "Load classes.", "findings": [ { "id": "loads-finding", "name": "Loads", "description": "Loads.", "questions": [ { "text": "How are load classes assigned to configurations, and which standards apply?", "kind": "measurement" }, { "text": "Which entry fits bridge load rating?", "kind": "action" } ] } ] } ] }, { "id": "use", "name": "Use", "description": "Uses and management.", "rationale": "Practice.", "layers": [ { "id": "uses", "name": "Uses", "description": "Military, emergency and civil.", "findings": [ { "id": "uses-finding", "name": "Uses", "description": "Uses.", "questions": [ { "text": "How are Bailey bridges used today in emergencies and civil works?", "kind": "provenance" }, { "text": "Which entry fits emergency infrastructure?", "kind": "action" } ] } ] }, { "id": "maintenance", "name": "Maintenance", "description": "Inspection.", "findings": [ { "id": "maintenance-finding", "name": "Maintenance", "description": "Maintenance.", "questions": [ { "text": "How are installed Bailey bridges inspected and maintained?", "kind": "provenance" }, { "text": "Is the question about a specific bridge, which needs its owner?", "kind": "boundary" } ] } ] } ] }, { "id": "history", "name": "History", "description": "History and heritage.", "rationale": "History.", "layers": [ { "id": "origins", "name": "Origins", "description": "Design and wartime use.", "findings": [ { "id": "origins-finding", "name": "Origins", "description": "Origins.", "questions": [ { "text": "How did Bailey design the bridge, and how was it used in the Second World War?", "kind": "provenance" }, { "text": "Which references are standard?", "kind": "provenance" } ] } ] }, { "id": "heritage", "name": "Heritage", "description": "Surviving examples.", "findings": [ { "id": "heritage-finding", "name": "Heritage", "description": "Heritage.", "questions": [ { "text": "Which historic Bailey bridges survive, and how are they protected?", "kind": "provenance" }, { "text": "Which entry fits a specific bridge?", "kind": "action" } ] } ] } ] } ] }, "openQuestions": [ "Should modern derivatives be separate entries?", "How should load class standards be linked?", "How should surviving heritage examples be recorded?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "building, structure or infrastructure", "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 Bailey bridge, record what state it is in, and decide what may be done with it.", "whatItIs": "Let an agent explain what a Bailey bridge is and how the panel system works, relay history, standard dimensions and load classes from engineering and historical sources, distinguish it from other prefabricated bridges, and relay heritage and current use information.", "characteristics": { "substance": "material", "origin": "manufactured", "agency": "inert", "mobility": "fixed", "scale": "built" }, "whatYouCanDoWithIt": [ "observed and measured", "entered, crossed or travelled along" ], "distinguishingFeatures": [ "Described in 34 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 Bailey bridge, and on what evidence are they told apart?" ], "whatItIsMadeOf": "matter you can touch", "physicalCharacter": [ "On the scale of a building: sited rather than moved.", "Stays where it was put; moving it is a project.", "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", "enter it, cross it, travel along it" ], "howItIsRecognised": [ "Recognised by form, materials and siting, and confirmed by address or by a register entry rather than by looking." ], "relatedModels": [], "standing": "Described in 34 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 Bailey bridge from another, and a Bailey bridge 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 Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge 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 Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge 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 at built scale.", "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 Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge is built from and which parts are replaceable.", "questions": [ { "id": "parts-and-materials-q01", "text": "What identifies and describes the composition of a Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge is judged and by whom.", "questions": [ { "id": "condition-assessment-q01", "text": "What identifies and describes the condition of a Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge is, how it got there and where it may go (fixed).", "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 Bailey bridge is, and what that position is measured against.", "questions": [ { "id": "position-and-frame-q01", "text": "What identifies and describes the location of a Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge 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 Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge 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 Bailey bridge between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a Bailey bridge 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 Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge 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 Bailey bridge is for, and what it is used for anyway.", "findings": [ { "id": "function-and-purpose", "name": "Function, purpose and misuse", "description": "The function a Bailey bridge performs and the uses that fall outside it.", "questions": [ { "id": "function-and-purpose-q01", "text": "What identifies and describes the use of a Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge.", "findings": [ { "id": "procedures-and-skills", "name": "Procedures, skills and required tools", "description": "What an agent needs before it can act on a Bailey bridge at all.", "questions": [ { "id": "procedures-and-skills-q01", "text": "What identifies and describes handling a Bailey bridge, 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 Bailey bridge, 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 Bailey bridge is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "structure-and-capacity", "name": "Structure, materials and capacity", "description": "How Bailey bridge is built and how much it can take.", "rationale": "Capacity and structural type govern what may lawfully happen inside or on it, and both are attested rather than obvious.", "layers": [ { "id": "construction", "name": "Construction and materials", "description": "Structural type, materials and principal dimensions.", "findings": [ { "id": "construction-record", "name": "Structural type and dimensions", "description": "What it is made of and how big it is.", "questions": [ { "id": "construction-record-q01", "text": "What structural type and materials characterise Bailey bridge, and what are its principal dimensions?", "kind": "measurement" }, { "id": "construction-record-q02", "text": "What in that construction limits how it may be altered?", "kind": "boundary" } ] } ] }, { "id": "capacity-and-load", "name": "Capacity and load", "description": "Occupancy, load ratings and their basis.", "findings": [ { "id": "capacity-record", "name": "Rated capacity and who set it", "description": "The limits and the authority that certified them.", "questions": [ { "id": "capacity-record-q01", "text": "What capacity or load is Bailey bridge rated for, under which code, certified by whom?", "kind": "provenance" }, { "id": "capacity-record-q02", "text": "What must an agent refuse to permit beyond that rating?", "kind": "action" } ] } ] } ] }, { "id": "tenure-and-condition", "name": "Ownership, permitting and condition", "description": "Who holds Bailey bridge, what it is permitted for, and what state it is in.", "rationale": "A structure is not the organisation that uses it, and its permission to exist is separate from its condition.", "layers": [ { "id": "tenure", "name": "Ownership and permission", "description": "Title, occupancy and the permits in force.", "findings": [ { "id": "tenure-record", "name": "Title, occupier and permits", "description": "Who owns, who occupies, and what is permitted.", "questions": [ { "id": "tenure-record-q01", "text": "Who owns and who occupies Bailey bridge, and which permits or consents are in force?", "kind": "definition" }, { "id": "tenure-record-q02", "text": "What distinguishes the structure from the organisation that operates in it?", "kind": "boundary" } ] } ] }, { "id": "inspection", "name": "Condition and inspection", "description": "Inspection regime, defects and remaining service life.", "findings": [ { "id": "inspection-record", "name": "Inspections and defects", "description": "What is inspected, how often, and what was found.", "questions": [ { "id": "inspection-record-q01", "text": "What inspection regime applies to Bailey bridge, at what interval, and by whom?", "kind": "provenance" }, { "id": "inspection-record-q02", "text": "What finding takes it out of service, and who may authorise its return?", "kind": "action" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a Bailey bridge 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 Bailey bridge and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a Bailey bridge, 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 Bailey bridge, 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 Bailey bridge 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 Bailey bridge is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a Bailey bridge, 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 Bailey bridge, 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 Bailey bridge is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 8, "layers": 17, "findings": 19, "questions": 53 } } } }