{
    "id": "/EventNotificationsOffer",
    "type": "object",
    "properties": {
      "id": {"type": "string"},
      "type": {"type": "string"},
      "actor": {
        "type": "object",
        "properties": {
            "id": {"type": "string"},
            "type": {"type": "string"},
            "inbox": {"type": "string"} 
        },
        "required": [ "id", "inbox" ]
      },
      "object": {
        "type": "object",
        "properties": {
            "id": {"type": "string"}
        },
        "oneOf": [
            {
                "properties" : {
                    "type": {"type": "string"}
                }
            },
            {
                "properties" : {
                    "type": {
                        "type": "array",
                        "items": {"type": "string"}
                    }
                }
            }
        ],
        "required": [ "id" ]
      } 
    },
    "required": ["id", "type", "actor", "object"]
}