{
  "schema": {
    "type": "record",
    "name": "AnnotationEvent",
    "namespace": "io.panproto.events",
    "fields": [
      { "name": "event_id", "type": "string" },
      { "name": "timestamp", "type": { "type": "long", "logicalType": "timestamp-millis" } },
      { "name": "document_id", "type": "string" },
      { "name": "annotator", "type": ["null", "string"], "default": null },
      { "name": "labels", "type": { "type": "array", "items": "string" } }
    ]
  },
  "datum": {
    "event_id": "ae-7f3a2b1c-0001",
    "timestamp": 1774560120000,
    "document_id": "doc-wsj-0042",
    "annotator": { "string": "annotator-12" },
    "labels": ["AGENT", "THEME", "PRED"]
  }
}
