{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Config2",
  "type": "object",
  "required": [
    "a_cfg",
    "b_cfg"
  ],
  "properties": {
    "a_cfg": {
      "$ref": "#/definitions/Config"
    },
    "b_cfg": {
      "$ref": "#/definitions/Config2"
    }
  },
  "definitions": {
    "Config": {
      "type": "object",
      "required": [
        "test"
      ],
      "properties": {
        "test": {
          "type": "string"
        }
      }
    },
    "Config2": {
      "type": "object",
      "required": [
        "test2"
      ],
      "properties": {
        "test2": {
          "type": "string"
        }
      }
    }
  }
}