{
  "type": "object",
  "title": "Event",
  "properties": {
    "age": {
      "type": "integer",
      "format": "int64",
      "description": "Time in milliseconds since the event was sent."
    },
    "content": {
      "type": "object",
      "title": "EventContent",
      "description": "The content of this event. The fields in this object will vary depending on the type of event."
    },
    "event_id": {
      "type": "string",
      "description": "Globally unique identifier for this event."
    },
    "origin_server_ts": {
      "type": "integer",
      "format": "int64",
      "description": "Timestamp in milliseconds on originating homeserver when this event was sent."
    },
    "prev_content": {
      "title": "EventContent",
      "type": "object",
      "description": "Optional. The previous ``content`` for this state. This will be present only for state events appearing in the ``timeline``. If this is not a state event, or there is no previous content, this key will be missing."
    },
    "prev_sender": {
      "type": "string",
      "description": "Optional. The ``sender`` of the previous event for this state. This will be present only for state events appearing in the ``timeline``. If this is not a state event, or there was no previous event for this state, this key will be missing."
    },
    "sender": {
      "type": "string",
      "description": "The MXID of the user who sent this event."
    },
    "state_key": {
      "type": "string",
      "description": "Optional. This key will only be present for state events. A unique key which defines the overwriting semantics for this piece of room state."
    },
    "type": {
      "type": "string",
      "description": "The type of event."
    },
    "txn_id": {
      "type": "string",
      "description": "Optional. The transaction ID set when this message was sent. This key will only be present for message events sent by the device calling this API."
    }
  }
}