{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.area","code":"thing-q11500","url":"https://ver.cy/models/thing/q11500/","name":"area","alternateNames":["fault zone","cadastral area","cross section","nuclear cross section","equivalent sound absorption area","fission cross section","slowing-down area","diffusion area","migration area","pupil opening area","effective area","surface area of the event horizon"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.QLT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A quantity expressing the extent of a two-dimensional surface or region, measured in square units such as square metres; related technical quantities include cross sections in physics and equivalent absorption area in acoustics.","purpose":"Let an agent handle area by definition, units, calculation, measurement and domain-specific uses.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Extent of a surface","Square units","Measurement conventions vary for buildings and land","Technical senses in physics and acoustics"],"structure":{"bundles":[{"id":"calculation","name":"Calculation","description":"Computing area.","layers":[{"id":"shape","name":"Shape","description":"Formula.","findings":[{"id":"shape-finding","name":"Shape","description":"Area calculation.","questions":[{"text":"What is the area of this shape?","kind":"measurement"},{"text":"Which formula applies?","kind":"definition"}]}]},{"id":"units","name":"Units","description":"Conversion.","findings":[{"id":"units-finding","name":"Units","description":"Units.","questions":[{"text":"What is the area in the required unit?","kind":"measurement"},{"text":"Is the conversion exact?","kind":"boundary"}]}]}]},{"id":"buildings","name":"Buildings","description":"Floor area.","layers":[{"id":"standard","name":"Standard","description":"Measurement rules.","findings":[{"id":"standard-finding","name":"Standard","description":"Floor area standard.","questions":[{"text":"Which floor area standard is used: gross, net or IPMS?","kind":"provenance"},{"text":"What is included?","kind":"definition"}]}]},{"id":"comparison","name":"Comparison","description":"Like for like.","findings":[{"id":"comparison-finding","name":"Comparison","description":"Comparison.","questions":[{"text":"Are areas measured the same way for comparison?","kind":"boundary"},{"text":"Who measured them?","kind":"provenance"}]}]}]},{"id":"land","name":"Land","description":"Cadastre.","layers":[{"id":"survey","name":"Survey","description":"Measurement.","findings":[{"id":"survey-finding","name":"Survey","description":"Land survey.","questions":[{"text":"What is the official land area, from the cadastre?","kind":"provenance"},{"text":"How accurate is it?","kind":"measurement"}]}]},{"id":"maps","name":"Maps","description":"Projection.","findings":[{"id":"maps-finding","name":"Maps","description":"Map areas.","questions":[{"text":"Is the map projection distorting areas?","kind":"boundary"},{"text":"Which projection preserves area?","kind":"definition"}]}]}]},{"id":"science","name":"Science","description":"Technical senses.","layers":[{"id":"cross-section","name":"Cross section","description":"Physics.","findings":[{"id":"cross-section-finding","name":"Cross section","description":"Cross section.","questions":[{"text":"Is a reaction cross section meant?","kind":"boundary"},{"text":"In which unit?","kind":"definition"}]}]},{"id":"acoustics","name":"Acoustics","description":"Absorption area.","findings":[{"id":"acoustics-finding","name":"Acoustics","description":"Absorption area.","questions":[{"text":"What is the equivalent absorption area of the room?","kind":"measurement"},{"text":"How is it measured?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Calculate and report areas with stated units and method.","Convert between units of area accurately."],"mustNot":["Misstate the area of land, property or rooms in a sale, lease or valuation.","Mix units of area without converting them.","Present an estimated area as a surveyed one."],"requiresHuman":["Using a calculated area in a legal document, such as a land title or lease."]},"ethics":{"considerations":["Area figures decide prices, taxes and boundaries, so errors shift money and rights.","Overstated floor areas in housing mislead buyers and tenants."],"affectedParties":["Buyers and tenants","Landowners"]},"owners":{"steward":"Nobody owns the quantity; land surveyors and registries answer for official land areas.","roles":[],"masterSystems":["Land registry or cadastre"]},"relations":[{"target":"Q107715","type":"parent","note":"registry parent class"},{"target":"Q123410660","type":"parent","note":"registry parent class"},{"target":"Q1277572","type":"parent","note":"registry parent class"},{"target":"Q181175","type":"parent","note":"registry parent class"},{"target":"Q1991596","type":"parent","note":"registry parent class"},{"target":"Q30337763","type":"parent","note":"registry parent class"},{"target":"physical quantity and geometric measure","type":"related","note":"category"},{"target":"square metre","type":"related","note":"unit"},{"target":"polygon and circle","type":"related","note":"shapes"},{"target":"volume","type":"related","note":"three dimensions"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.area","Wikidata: Q11500 (https://www.wikidata.org/wiki/Q11500)","SI unit: square metre (m2) unit"]},"properties":{"applicability":"not-applicable","items":["hectare: 10000 m2 - exact","acre: about 4046.86 m2"]},"recognition":{"applicability":"optional","items":["Units such as m2, hectare, acre","Floor area and land area figures","Cross section in physics is measured in barns","Not visible itself; the size of a surface."]},"capabilities":{"applicability":"required","items":["compute areas of shapes","convert area units","measure floor or land area","use cross sections in physics"]},"hazards":{"applicability":"required","items":["Different floor area definitions","Unit conversion errors","Map projection distortion of areas"]},"interfaces":{"applicability":"required","items":["ISO 80000-3","Floor area measurement standards such as IPMS","Cadastral survey rules"]},"context":{"applicability":"required","items":["Measuring land, floors, surfaces and cross sections.","geometric area","land and cadastral area","floor area","surface area","cross sections"]}},"sources":[{"title":"Wikidata item Q11500: area","url":"https://www.wikidata.org/wiki/Q11500","note":"identity and sense of the item"},{"title":"Wikipedia: Area","url":"https://en.wikipedia.org/wiki/Area","note":"general description of the item"}],"openQuestions":["Should area kinds be separate entries?","How should measurement standards be linked?","How should cross sections be split off?"],"resources":{"spec":"/models/things/publications/thing-q11500/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q11500/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T08:35:59Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-06T19:51:53+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties."},"score":1.0}}