{
  "lhs": {
    "type": "array",
    "items": [
      {"const": "start_unmerge"},
      {"$ref": "#/definitions/Hello"}
    ],
    "definitions": {
      "Hello": {
        "type": "object"
      }
    }
  },
  "rhs": {
    "type": "array",
    "items": [
      {"const": "start_unmerge"},
      {"$ref": "#/definitions/Hello"}
    ],
    "definitions": {
      "Hello": {
        "type": "object",
        "properties": {"transaction_id": {"type": "string"}}
      }
    }
  }
}