[
  {
    "namespace": "nonOptionalManifestKeyException",
    "description": "The nonOptionalManifestKeyException API. Should produce an exception as the manifest key has not been specified as optional.",
    "manifest_keys": {
      "foo": {
        "type": "object",
        "properties": {
          "keyword": {
            "type": "string",
            "description": "The keyword to register with the foobox. Must be non-empty."
          }
        }
      }
    }
  }
]