{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-13T06:25:25Z",
    "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",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-06T10:00:00Z",
      "ingestedAt": "2026-10-06T07:11:43+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-06T19:51:54+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q1471176",
    "registryId": "vr.tr.tetraconch",
    "name": "Tetraconch",
    "version": "0.2.0-wave.3",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.BLT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q1471176/",
  "model": {
    "registry_id": "vr.tr.tetraconch",
    "name": "Tetraconch",
    "purpose": "Let an agent explain the tetraconch plan and its variants, relay history, examples and structural logic from architectural history sources, describe regional traditions, and distinguish tetraconch from triconch, cross-in-square and other centralised plans.",
    "definition": "A centralised building plan in which four apses or semicircular exedrae radiate from a central square or circular space, giving a four-lobed form, used in late antique and early medieval architecture for churches, martyria and baptisteries in Armenia, Georgia, Syria, Italy and elsewhere, with variants such as the double-shell tetraconch with an inner colonnade, and later revived in Renaissance and Baroque centralised designs.",
    "what_it_is_for": "A centralised plan for churches and other buildings.",
    "affordances": [
      "explain the plan and variants",
      "relay history and examples",
      "describe regional traditions",
      "distinguish related plans"
    ],
    "distinguishing_features": [
      "Four apses",
      "Central space",
      "Single or double shell",
      "Late antique origin"
    ],
    "appearance": "A four-lobed building with apses on each side of a central space.",
    "visual_identification": [
      "Four-apsed centralised plan",
      "Simple and double-shell tetraconchs, Armenian and Georgian tetraconch churches",
      "A triconch has three apses; a cross-in-square is a Byzantine plan; a rotunda is round"
    ],
    "physical_properties": [
      {
        "quantity": "early examples",
        "typical_range": "4th-7th centuries",
        "unit": "period",
        "note": ""
      },
      {
        "quantity": "Zvartnots",
        "typical_range": "7th century",
        "unit": "period",
        "note": "Armenia, double-shell"
      },
      {
        "quantity": "San Lorenzo, Milan",
        "typical_range": "4th century",
        "unit": "period",
        "note": "double-shell tetraconch"
      }
    ],
    "families_and_kinds": [
      "simple tetraconchs",
      "double-shell or aisled tetraconchs such as Zvartnots and San Lorenzo",
      "Armenian and Georgian tetraconch churches such as Jvari",
      "Syrian and Mesopotamian tetraconchs",
      "Renaissance and Baroque centralised revivals"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "centralized building",
        "why": "in registry terms"
      },
      {
        "relation": "is exemplified by",
        "target": "Zvartnots Cathedral",
        "why": "a double-shell tetraconch"
      },
      {
        "relation": "is contrasted with",
        "target": "triconch",
        "why": "a three-apsed plan"
      },
      {
        "relation": "is used in",
        "target": "Armenian church architecture",
        "why": "and Georgian architecture"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "Heritage protection including UNESCO listings such as Zvartnots and Jvari",
      "No design regulation"
    ],
    "failure_modes_and_hazards": [
      "Confusing tetraconch with triconch or cross-in-square",
      "Structural vulnerability of domes, as at Zvartnots",
      "Contested attributions of origin"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Describe the tetraconch plan and its examples from architectural sources.",
        "Note where the origin and attribution of the form are contested."
      ],
      "must_not": [
        "Confuse tetraconchs with triconchs or cross-in-square plans.",
        "Present contested national claims to the form as settled.",
        "Encourage climbing or damaging fragile ruins."
      ],
      "requires_human": [
        "Restoring or reconstructing a historic tetraconch building."
      ]
    },
    "ethics": {
      "considerations": [
        "Historic churches and ruins are heritage held by communities and states.",
        "Attribution of origin is entangled with national pride."
      ],
      "affected_parties": [
        "Heritage sites",
        "Religious communities",
        "Scholars"
      ]
    },
    "owners": {
      "steward": "The owner of each building, often a church or state heritage body.",
      "master_systems": [
        "Heritage and monument registers"
      ]
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q1471176: Tetraconch",
      "url": "https://www.wikidata.org/wiki/Q1471176",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Tetraconch",
      "url": "https://en.wikipedia.org/wiki/Tetraconch",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "understand",
        "name": "Understand",
        "description": "What a tetraconch is.",
        "rationale": "Definition.",
        "layers": [
          {
            "id": "definition",
            "name": "Definition",
            "description": "Definition.",
            "findings": [
              {
                "id": "definition-finding",
                "name": "Definition",
                "description": "Definition.",
                "questions": [
                  {
                    "text": "What is a tetraconch plan, and how does it differ from triconch, cross-in-square and rotunda plans?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is the question about the plan type, a variant or a specific building?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "variants",
            "name": "Variants",
            "description": "Variants.",
            "findings": [
              {
                "id": "variants-finding",
                "name": "Variants",
                "description": "Variants.",
                "questions": [
                  {
                    "text": "How do simple and double-shell tetraconchs differ, and how are domes supported?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits the specific variant?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "history",
        "name": "History",
        "description": "History.",
        "rationale": "Attribution.",
        "layers": [
          {
            "id": "origins",
            "name": "Origins",
            "description": "Origins.",
            "findings": [
              {
                "id": "origins-finding",
                "name": "Origins",
                "description": "Origins.",
                "questions": [
                  {
                    "text": "Where and when did the tetraconch arise, and what debates exist about its origin, with positions attributed?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which references are standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "regions",
            "name": "Regions",
            "description": "Regional traditions.",
            "findings": [
              {
                "id": "regions-finding",
                "name": "Regions",
                "description": "Regions.",
                "questions": [
                  {
                    "text": "How did Armenia, Georgia, Syria and Italy develop tetraconch churches?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which sources are cited?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "examples",
        "name": "Examples",
        "description": "Examples.",
        "rationale": "Sources.",
        "layers": [
          {
            "id": "buildings",
            "name": "Buildings",
            "description": "Notable buildings.",
            "findings": [
              {
                "id": "buildings-finding",
                "name": "Buildings",
                "description": "Buildings.",
                "questions": [
                  {
                    "text": "What are notable tetraconchs, such as Zvartnots, Jvari, San Lorenzo in Milan and Bosra?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits the specific building?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "revivals",
            "name": "Revivals",
            "description": "Later revivals.",
            "findings": [
              {
                "id": "revivals-finding",
                "name": "Revivals",
                "description": "Revivals.",
                "questions": [
                  {
                    "text": "How did Renaissance and later architects revive centralised four-apsed plans?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits centrally planned church?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "context",
        "name": "Context",
        "description": "Meaning and study.",
        "rationale": "Context.",
        "layers": [
          {
            "id": "meaning",
            "name": "Meaning",
            "description": "Symbolism.",
            "findings": [
              {
                "id": "meaning-finding",
                "name": "Meaning",
                "description": "Meaning.",
                "questions": [
                  {
                    "text": "What symbolic and liturgical meanings have been attached to the tetraconch, with interpretations attributed?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is the presentation attributed?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "study",
            "name": "Study",
            "description": "Study.",
            "findings": [
              {
                "id": "study-finding",
                "name": "Study",
                "description": "Study.",
                "questions": [
                  {
                    "text": "How do archaeologists and architectural historians study and reconstruct tetraconchs?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits architectural history?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should double-shell tetraconch and Zvartnots be separate primary entries?",
    "How should architectural history sources be linked?",
    "How should regional traditions be recorded?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}