{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.quadripoint","code":"thing-q15664","url":"https://ver.cy/models/thing/q15664/","name":"quadripoint","alternateNames":[],"kind":"thing","status":"published","version":"0.2.0-wave.3","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.BLT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A point at which the boundaries of four distinct territories meet, whether countries, states, provinces or counties, such as the Four Corners of the United States where Arizona, Colorado, New Mexico and Utah meet, and the disputed or near-quadripoints between countries such as the Zambia-Zimbabwe-Botswana-Namibia point on the Zambezi; true international quadripoints are rare and some claimed points are in fact two closely spaced tripoints.","purpose":"Let an agent explain quadripoints and their geometry, relay known examples and disputes from geographic and legal sources with attribution, describe how such points are surveyed and marked, and distinguish quadripoints from tripoints, near-quadripoints and boundary monuments.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Four boundaries","Rare internationally","Survey precision","Legal status"],"structure":{"bundles":[{"id":"understand","name":"Understand","description":"What a quadripoint is.","layers":[{"id":"definition","name":"Definition","description":"Definition.","findings":[{"id":"definition-finding","name":"Definition","description":"Definition.","questions":[{"text":"What is a quadripoint, and how does it differ from a tripoint and a near-quadripoint?","kind":"definition"},{"text":"Is the question about the concept or a specific point?","kind":"boundary"}]}]},{"id":"examples","name":"Examples","description":"Examples.","findings":[{"id":"examples-finding","name":"Examples","description":"Examples.","questions":[{"text":"What are the Four Corners, the Zambezi point and other claimed quadripoints?","kind":"definition"},{"text":"Which entry fits the specific point?","kind":"action"}]}]}]},{"id":"geometry","name":"Geometry","description":"Geometry and survey.","layers":[{"id":"survey","name":"Survey","description":"Surveying.","findings":[{"id":"survey-finding","name":"Survey","description":"Survey.","questions":[{"text":"How are boundary points surveyed and marked, and why do markers sometimes differ from intended positions?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"rarity","name":"Rarity","description":"Rarity.","findings":[{"id":"rarity-finding","name":"Rarity","description":"Rarity.","questions":[{"text":"Why are true quadripoints rare, and how do near-quadripoints arise?","kind":"provenance"},{"text":"Which sources are cited?","kind":"provenance"}]}]}]},{"id":"law","name":"Law","description":"Law and disputes.","layers":[{"id":"treaties","name":"Treaties","description":"Treaties.","findings":[{"id":"treaties-finding","name":"Treaties","description":"Treaties.","questions":[{"text":"How do treaties define boundary points?","kind":"provenance"},{"text":"Which entry fits boundary treaty?","kind":"action"}]}]},{"id":"disputes","name":"Disputes","description":"Disputes.","findings":[{"id":"disputes-finding","name":"Disputes","description":"Disputes.","questions":[{"text":"What disputes exist about the Zambezi point and others, with positions attributed?","kind":"provenance"},{"text":"Is the presentation neutral?","kind":"boundary"}]}]}]},{"id":"context","name":"Context","description":"Culture and visiting.","layers":[{"id":"visiting","name":"Visiting","description":"Visiting.","findings":[{"id":"visiting-finding","name":"Visiting","description":"Visiting.","questions":[{"text":"How are quadripoints visited and commemorated?","kind":"action"},{"text":"Which entry fits Four Corners Monument?","kind":"action"}]}]},{"id":"history","name":"History","description":"History.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"What historical quadripoints existed, such as the Vierlandenpunt?","kind":"provenance"},{"text":"Which entry fits the specific historical point?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Describe quadripoints such as the Four Corners and explain how they differ from near-quadripoints.","Report boundary positions with the survey source and date."],"mustNot":["Claim a quadripoint where the boundaries only come close to meeting.","Take a side on disputed boundaries as settled fact.","Guide visitors across closed or guarded borders at a quadripoint.","Present a monument marker as the legal boundary when they differ."],"requiresHuman":["Publishing boundary positions that bear on a dispute between states."]},"ethics":{"considerations":["Border points can be politically disputed; framing affects real claims.","Some quadripoints lie on tribal or indigenous land that visitors should respect."],"affectedParties":["Border residents","Indigenous nations","Visitors"]},"owners":{"steward":"The states and survey authorities that define the boundaries.","roles":[],"masterSystems":["National boundary and survey records"]},"relations":[{"target":"Q1540416","type":"parent","note":"registry parent class"},{"target":"boundary point","type":"related","note":"in registry terms"},{"target":"tripoint","type":"related","note":"where three territories meet"},{"target":"Four Corners Monument","type":"related","note":"in the United States"},{"target":"boundary survey","type":"related","note":"and treaties"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.quadripoint","Wikidata: Q15664 (https://www.wikidata.org/wiki/Q15664)"]},"properties":{"applicability":"required","items":["Four Corners monument: 1912 year - first marker","international quadripoints: none universally agreed note","subnational quadripoints: many note - counties and provinces"]},"recognition":{"applicability":"required","items":["Point where four territories meet","Four Corners, Zambezi near-quadripoint","A tripoint has three territories; near-quadripoints are two tripoints close together","A marker or monument where four boundaries converge."]},"capabilities":{"applicability":"required","items":["explain the concept","relay examples and disputes","describe surveying and marking","distinguish related points"]},"hazards":{"applicability":"required","items":["Claiming quadripoints that are near-quadripoints","Survey errors affecting marker positions","Disputed boundaries, to be attributed"]},"interfaces":{"applicability":"required","items":["Boundary treaties and surveys","Geodetic standards for boundary marking"]},"context":{"applicability":"required","items":["Not applicable; a boundary feature.","international quadripoints and near-quadripoints","subnational quadripoints such as Four Corners","county and municipal quadripoints","quadripoints in water bodies","historical quadripoints such as the Vierlandenpunt"]}},"sources":[{"title":"Wikidata item Q15664: quadripoint","url":"https://www.wikidata.org/wiki/Q15664","note":"identity and sense of the item"},{"title":"Wikipedia: Quadripoint","url":"https://en.wikipedia.org/wiki/Quadripoint","note":"general description of the item"}],"openQuestions":["Should the Zambezi point be a separate entry?","How should geographic sources be linked?","How should disputed claims be recorded?"],"resources":{"spec":"/models/things/publications/thing-q15664/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q15664/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-13T07:14:03Z","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":"filled","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 2026-10-06T19:51:54+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}