{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T22:30:46Z",
    "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": "2026-10-06T07:00:49+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-07T10:10:28+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q2031967",
    "registryId": "vr.tr.mullion",
    "name": "mullion",
    "version": "0.2.0-wave.3",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.BLT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q2031967/",
  "model": {
    "registry_id": "vr.tr.mullion",
    "name": "mullion",
    "purpose": "Let an agent explain what a mullion is and how it differs from transoms and glazing bars, relay its role in historical and modern construction, and help with terminology in architecture, conservation and glazing.",
    "definition": "A vertical bar dividing a window, door or screen into sections, structural in medieval stone tracery and in timber and metal frames, and used in modern curtain walls as the vertical member carrying glazing; mullions are distinguished from transoms, which are horizontal, and from glazing bars, which subdivide panes, and they define the appearance of Gothic, Tudor and modern facades.",
    "what_it_is_for": "Dividing and supporting window and facade openings.",
    "affordances": [
      "explain the element and its role",
      "distinguish from transoms and glazing bars",
      "relay historical and modern forms",
      "help with terminology"
    ],
    "distinguishing_features": [
      "Vertical orientation",
      "Structural or decorative",
      "Historical and modern forms",
      "Defines facade rhythm"
    ],
    "appearance": "A vertical bar of stone, wood, metal or plastic between window lights or glazing panels.",
    "visual_identification": [
      "Vertical divider in a window or facade",
      "Stone, timber, metal or modern systems",
      "Transoms are horizontal; glazing bars subdivide a single pane; a column supports a building"
    ],
    "physical_properties": [
      {
        "quantity": "Member height",
        "unit": "mm",
        "typical_range": "",
        "note": "Measure the vertical extent between the member's end connections."
      },
      {
        "quantity": "Face width",
        "unit": "mm",
        "typical_range": "",
        "note": "Measure the visible width perpendicular to the member's vertical axis."
      },
      {
        "quantity": "Section depth",
        "unit": "mm",
        "typical_range": "",
        "note": "Measure the cross-sectional dimension perpendicular to the glazing or screen plane."
      },
      {
        "quantity": "Mass per unit length",
        "unit": "kg/m",
        "typical_range": "",
        "note": "Determine mass per measured length for the specified material and section."
      }
    ],
    "families_and_kinds": [
      "stone mullions in Gothic and Tudor windows",
      "timber mullions in casement and sash windows",
      "metal mullions in curtain walls",
      "applied and decorative mullions",
      "mullions in doors and screens"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "column",
        "why": "in registry terms, a slender vertical member"
      },
      {
        "relation": "is a kind of",
        "target": "architectural element",
        "why": "of windows and facades"
      },
      {
        "relation": "is contrasted with",
        "target": "transom",
        "why": "the horizontal member"
      },
      {
        "relation": "is part of",
        "target": "window",
        "why": "or a curtain wall"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "Building codes for glazing and curtain walls",
      "Heritage conservation guidance for historic windows",
      "Thermal performance standards for frames"
    ],
    "failure_modes_and_hazards": [
      "Thermal bridging in metal mullions",
      "Structural failure under wind load",
      "Confusing mullion with transom"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Identify mullions and distinguish them from transoms and glazing bars.",
        "Describe the role of mullions in a facade or historic window from drawings and surveys.",
        "Report cracked stone or corroded mullions to the building owner."
      ],
      "must_not": [
        "Approve a curtain wall design without checking mullion wind load by a qualified engineer.",
        "Remove or cut a mullion that may be structural without engineering advice.",
        "Alter historic stone mullions in a protected building without consent.",
        "Confuse mullions with transoms in specifications."
      ],
      "requires_human": [
        "Replacing or altering mullions on a protected or occupied building."
      ]
    },
    "ethics": {
      "considerations": [
        "Failed mullions can drop glass onto people below.",
        "Original mullions are part of the character of historic buildings."
      ],
      "affected_parties": [
        "Occupants",
        "Passers-by",
        "Building owners"
      ]
    },
    "owners": {
      "steward": "The owner of the building; building control approves structural changes.",
      "master_systems": []
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q2031967: mullion",
      "url": "https://www.wikidata.org/wiki/Q2031967",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Mullion",
      "url": "https://en.wikipedia.org/wiki/Mullion",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "identify",
        "name": "Identify",
        "description": "What a mullion is.",
        "rationale": "Identity.",
        "layers": [
          {
            "id": "definition",
            "name": "Definition",
            "description": "Definition and distinctions.",
            "findings": [
              {
                "id": "definition-finding",
                "name": "Definition",
                "description": "Definition.",
                "questions": [
                  {
                    "text": "What is a mullion, and how does it differ from a transom and a glazing bar?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is the element a mullion, a transom, a glazing bar or a column?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "kinds",
            "name": "Kinds",
            "description": "Kinds.",
            "findings": [
              {
                "id": "kinds-finding",
                "name": "Kinds",
                "description": "Kinds.",
                "questions": [
                  {
                    "text": "What kinds of mullion exist by material and period?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits the specific kind?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "design",
        "name": "Design",
        "description": "Design and construction.",
        "rationale": "Practice.",
        "layers": [
          {
            "id": "structure",
            "name": "Structure",
            "description": "Structural role.",
            "findings": [
              {
                "id": "structure-finding",
                "name": "Structure",
                "description": "Structure.",
                "questions": [
                  {
                    "text": "How do mullions carry loads in stone tracery and in curtain walls?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits curtain wall?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "performance",
            "name": "Performance",
            "description": "Performance.",
            "findings": [
              {
                "id": "performance-finding",
                "name": "Performance",
                "description": "Performance.",
                "questions": [
                  {
                    "text": "How do mullions affect thermal, acoustic and weather performance?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which references are standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "history",
        "name": "History",
        "description": "History and style.",
        "rationale": "Context.",
        "layers": [
          {
            "id": "gothic",
            "name": "Gothic",
            "description": "Gothic and Tudor.",
            "findings": [
              {
                "id": "gothic-finding",
                "name": "Gothic",
                "description": "Gothic.",
                "questions": [
                  {
                    "text": "How did stone mullions and tracery develop in Gothic and Tudor architecture?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits tracery?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "modern",
            "name": "Modern",
            "description": "Modern facades.",
            "findings": [
              {
                "id": "modern-finding",
                "name": "Modern",
                "description": "Modern.",
                "questions": [
                  {
                    "text": "How do mullions shape modern curtain wall facades?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits modernist architecture?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "care",
        "name": "Care",
        "description": "Conservation.",
        "rationale": "Practice.",
        "layers": [
          {
            "id": "conservation",
            "name": "Conservation",
            "description": "Conservation.",
            "findings": [
              {
                "id": "conservation-finding",
                "name": "Conservation",
                "description": "Conservation.",
                "questions": [
                  {
                    "text": "How are historic mullions repaired and conserved?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits window conservation?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "terms",
            "name": "Terms",
            "description": "Terminology.",
            "findings": [
              {
                "id": "terms-finding",
                "name": "Terms",
                "description": "Terms.",
                "questions": [
                  {
                    "text": "How do glazing and architecture trades use the term, and where do usages differ?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which sources are cited?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should curtain wall mullions be a separate entry?",
    "How should glazing standards be linked?",
    "Is the registry parent assignment to column appropriate?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}