{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-13T06:52:40Z",
    "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": "2026-10-06T07:11:16+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-06T19:51:55+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q1738955",
    "registryId": "vr.tr.light-characteristic",
    "name": "light characteristic",
    "version": "0.2.0-wave.3",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "XCT.QLT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q1738955/",
  "model": {
    "registry_id": "vr.tr.light-characteristic",
    "name": "light characteristic",
    "purpose": "Let an agent explain light characteristics and their notation, relay the standard classes and abbreviations from hydrographic sources, describe how mariners use them, and distinguish light characteristics from daymarks, sound signals and electronic aids.",
    "definition": "The pattern of light shown by a lighthouse, buoy or beacon that identifies it to mariners at night, described by rhythm, colour and period, in classes such as fixed lights that shine steadily, flashing lights where the light is shorter than the dark, long flashing lights with flashes of two seconds or more, group flashing and group long flashing lights with flashes in groups, occulting and group occulting lights where the dark is shorter than the light, isophase lights with equal periods, and quick and very quick lights; characteristics are recorded in light lists and on charts.",
    "what_it_is_for": "Identifying navigational lights.",
    "affordances": [
      "explain classes and notation",
      "relay standards",
      "describe use in navigation",
      "distinguish related aids"
    ],
    "distinguishing_features": [
      "Rhythm classes",
      "Colour and period",
      "Standard abbreviations",
      "Charted"
    ],
    "appearance": "Not a visible object as a concept; a rhythm of light at night.",
    "visual_identification": [
      "Rhythm and colour pattern of a navigational light",
      "Fixed, flashing, long flashing, group flashing, group long flashing, occulting, group occulting, isophase, quick lights",
      "Daymarks are visual shapes; sound signals are fog horns; AIS and radar beacons are electronic"
    ],
    "physical_properties": [
      {
        "quantity": "long flash minimum",
        "typical_range": "2",
        "unit": "seconds",
        "note": ""
      },
      {
        "quantity": "quick light rate",
        "typical_range": "50-79",
        "unit": "flashes per minute",
        "note": ""
      },
      {
        "quantity": "chart notation example",
        "typical_range": "Fl(2) 10s",
        "unit": "note",
        "note": "two flashes every ten seconds"
      },
      {
        "quantity": "standard body",
        "typical_range": "IALA",
        "unit": "name",
        "note": ""
      }
    ],
    "families_and_kinds": [
      "fixed lights",
      "flashing and group flashing lights",
      "long flashing and group long flashing lights",
      "occulting and group occulting lights",
      "isophase lights",
      "quick, very quick and ultra quick lights",
      "composite and alternating lights"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "property",
        "why": "in registry terms"
      },
      {
        "relation": "is shown by",
        "target": "lighthouse",
        "why": "and buoys"
      },
      {
        "relation": "is standardised by",
        "target": "International Association of Marine Aids to Navigation and Lighthouse Authorities",
        "why": "IALA"
      },
      {
        "relation": "is recorded in",
        "target": "nautical chart",
        "why": "and light lists"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "IALA recommendations on light characteristics",
      "National light lists and chart symbol standards such as INT 1",
      "IHO chart specifications"
    ],
    "failure_modes_and_hazards": [
      "Misreading characteristics leading to navigational error",
      "Confusing flashing and occulting lights",
      "Stale light list data"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Explain the classes of light characteristic and how they are written on charts.",
        "Report a light's characteristic from the current official light list, with its date."
      ],
      "must_not": [
        "Present outdated light list data as current.",
        "Confuse flashing and occulting lights.",
        "Tell a mariner to navigate by a light characteristic without checking the official chart.",
        "Report a light as working without evidence when it may have failed."
      ],
      "requires_human": [
        "Reporting a failed or wrong light to the lighthouse authority."
      ]
    },
    "ethics": {
      "considerations": [
        "Mariners' lives depend on reading lights correctly.",
        "Lighthouses are also heritage for coastal communities."
      ],
      "affected_parties": [
        "Mariners",
        "Fishers",
        "Coastal communities"
      ]
    },
    "owners": {
      "steward": "The national lighthouse authority that operates the light.",
      "master_systems": [
        "Official lists of lights and nautical charts"
      ]
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q1738955: light characteristic",
      "url": "https://www.wikidata.org/wiki/Q1738955",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Light characteristic",
      "url": "https://en.wikipedia.org/wiki/Light_characteristic",
      "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 light characteristic is.",
        "rationale": "Definition.",
        "layers": [
          {
            "id": "definition",
            "name": "Definition",
            "description": "Definition.",
            "findings": [
              {
                "id": "definition-finding",
                "name": "Definition",
                "description": "Definition.",
                "questions": [
                  {
                    "text": "What is a light characteristic, and how does it differ from daymarks, sound signals and electronic aids?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is the question about characteristics in general, a class or a specific light?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "classes",
            "name": "Classes",
            "description": "Classes.",
            "findings": [
              {
                "id": "classes-finding",
                "name": "Classes",
                "description": "Classes.",
                "questions": [
                  {
                    "text": "How do fixed, flashing, long flashing, group flashing, occulting, group occulting, isophase and quick lights differ?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits the specific class?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "use",
        "name": "Use",
        "description": "Use at sea.",
        "rationale": "Practice.",
        "layers": [
          {
            "id": "reading",
            "name": "Reading",
            "description": "Reading charts and lists.",
            "findings": [
              {
                "id": "reading-finding",
                "name": "Reading",
                "description": "Reading.",
                "questions": [
                  {
                    "text": "How are characteristics abbreviated on charts and in light lists, and how are they timed at sea?",
                    "kind": "action"
                  },
                  {
                    "text": "Which references are standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "identification",
            "name": "Identification",
            "description": "Identifying lights.",
            "findings": [
              {
                "id": "identification-finding",
                "name": "Identification",
                "description": "Identification.",
                "questions": [
                  {
                    "text": "How do mariners identify lights by rhythm, colour, sector and range?",
                    "kind": "action"
                  },
                  {
                    "text": "Which sources are cited?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "standards",
        "name": "Standards",
        "description": "Standards.",
        "rationale": "Regulation.",
        "layers": [
          {
            "id": "iala",
            "name": "IALA",
            "description": "IALA and IHO.",
            "findings": [
              {
                "id": "iala-finding",
                "name": "IALA",
                "description": "IALA.",
                "questions": [
                  {
                    "text": "What do IALA and IHO standards specify for light characteristics and chart symbols?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits IALA?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "technology",
            "name": "Technology",
            "description": "Technology.",
            "findings": [
              {
                "id": "technology-finding",
                "name": "Technology",
                "description": "Technology.",
                "questions": [
                  {
                    "text": "How do lamps, LEDs and flashers produce characteristics?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits lighthouse optics?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "context",
        "name": "Context",
        "description": "History.",
        "rationale": "Context.",
        "layers": [
          {
            "id": "history",
            "name": "History",
            "description": "History.",
            "findings": [
              {
                "id": "history-finding",
                "name": "History",
                "description": "History.",
                "questions": [
                  {
                    "text": "How did light characteristics develop from fixed fires to rotating optics and standardised rhythms?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits the history of lighthouses?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "related",
            "name": "Related",
            "description": "Related aids.",
            "findings": [
              {
                "id": "related-finding",
                "name": "Related",
                "description": "Related.",
                "questions": [
                  {
                    "text": "How do sector lights, leading lights and buoyage systems complement characteristics?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits IALA maritime buoyage system?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should each characteristic class be a separate entry?",
    "How should hydrographic standards be linked?",
    "The registry entry has merged aliases naming classes; should they be split off?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}