{
  "$schema": "http://json-schema.org/schema#",
  "$ref": "#/definitions/scopes",

  "definitions": {
    "scopes": {
      "type": "object",
      "patternProperties": {
        "^[a-z]+$": {
          "anyOf": [
            {"$ref": "#/definitions/scopes"},
            {"type": "null"}
          ]
        }
      },
      "additionalProperties": false
    }
  }
}