{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "key"
  ],
  "properties": {
    "key": {
      "oneOf": [
        {
          "type": "array",
          "description": "key is an array of values (though a single value is treated as a one-element array), to form a heirarchy. Using the first element of the key as the plugin name (e.g. [ 'summary' ]) is recommended. A key can either have children or a value, never both: parents are created and removed automatically.",
          "items": {
            "type": "string"
          }
        },
        {
          "type": "string"
        }
      ]
    },
    "generation": {
      "type": "u64",
      "description": "If specified, means that the update will fail if the previously-existing data is not exactly that generation. This allows for simple atomicity. This is only legal with mode “must-replace” or “must-append”."
    }
  }
}