{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "event_id": {
      "type": "string",
      "minLength": 1
    },
    "event_type": {
      "type": "string",
      "minLength": 1
    },
    "schema_version": {
      "type": "string",
      "pattern": "^\\d+\\.\\d+\\.\\d+$"
    },
    "occurred_at": {
      "type": "string",
      "format": "date-time",
      "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z))$"
    },
    "causation_id": {
      "type": "string",
      "minLength": 1
    },
    "correlation_id": {
      "type": "string",
      "minLength": 1
    },
    "payload": {}
  },
  "required": [
    "event_id",
    "event_type",
    "schema_version",
    "occurred_at",
    "causation_id",
    "correlation_id",
    "payload"
  ],
  "additionalProperties": false,
  "$id": "https://vpp-ai-platform/contracts/event_envelope.json",
  "title": "EventEnvelope"
}