{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "style"
  ],
  "properties": {
    "style": {
      "type": "string",
      "enum": [
        "perkb",
        "perkw"
      ]
    }
  }
}