{
  "validator": [
    "Rx",
    {
      "combine": "all",
      "path": "rx.json",
      "schema": [
        {
          "type": "//rec",
          "rest": "//any",
          "required": {
            "friend": {
              "type": "/perl/obj",
              "isa" : "TestFriend"
            }
          }
        },
        {
          "type": "//rec",
          "rest": "//any",
          "optional": {
            "how_long": "//any"
          }
        }
      ]
    }
  ],
  "header": [
    { "Subject": "Test Rx Message" },
    { "From":    "test@test.com"   }
  ],
  "type": "text/plain",
  "body": "This is a plaintext message."
}