{
  "schema_version": "tacitus.teaching-example/1.0",
  "id": "northbridge-correction-example",
  "title": "Repetition, competing claims and a correction",
  "status": "manually-authored synthetic teaching example; not DIALECTICA-compiled or PRAXIS-generated",
  "license": "CC-BY-4.0",
  "attribution": "TACITUS",
  "question": "Is the Northbridge crossing closed to all traffic?",
  "sources": [
    {
      "id": "S1",
      "reported_at": "2026-09-01T09:10:00Z",
      "text": "A driver reports that the Northbridge crossing is closed. The authority has not commented."
    },
    {
      "id": "S2",
      "reported_at": "2026-09-01T09:35:00Z",
      "text": "Northbridge crossing closed, according to the local dispatch."
    },
    {
      "id": "S3",
      "reported_at": "2026-09-01T12:10:00Z",
      "text": "Freight inspections are delayed. Passenger lanes remain open as of noon."
    }
  ],
  "claims": [
    {
      "id": "C1",
      "source": "S1",
      "quote": "the Northbridge crossing is closed",
      "classification": "unverified account",
      "review_status": "qualified by C3"
    },
    {
      "id": "C2",
      "source": "S2",
      "quote": "Northbridge crossing closed",
      "classification": "repetition of C1; not independent corroboration",
      "review_status": "retain source dependency"
    },
    {
      "id": "C3",
      "source": "S3",
      "quote": "Passenger lanes remain open as of noon",
      "classification": "attributed authority statement",
      "review_status": "inspect scope and obtain independent confirmation"
    }
  ],
  "relations": [
    { "from": "C2", "to": "C1", "kind": "repeats" },
    {
      "from": "C3",
      "to": "C1",
      "kind": "qualifies",
      "reason": "Passenger access contradicts a blanket closure interpretation, but does not establish freight conditions."
    }
  ],
  "review": {
    "reviewed_at": "2026-09-30",
    "reviewer": "TACITUS authored example; no independent review claimed",
    "decision": "Keep original claims and revise the blanket closure wording.",
    "brief": "An initial closure report was repeated without a new observation. A later authority statement reports freight delays and open passenger lanes. Current independent conditions remain unconfirmed.",
    "open_question": "Are the reported passenger conditions independently confirmed?"
  }
}