json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "race env map file",
      "definitions": {
          "point": {
              "type": "array",
              "items": {
                  "type": "number"
              },
              "minItems": 2,
              "maxItems": 2
          }
      },
      "type": "object",
      "properties": {
          "size": {
              "type": "array",
              "items": {
                  "type": "integer"
              },
              "minItems": 2,
              "maxItems": 2
          },
          "max_time": {
              "type": "number"
          },
          "cars": {
              "type": "array",
              "items": {
                  "type": "array",
                  "items": {
                      "type": "number"
                  },
                  "minItems": 3,
                  "maxItems": 3
              }
          },
          "walls": {
              "type": "array",
              "items": {
                  "type": "array",
                  "items": {
                      "$ref": "#/definitions/point"
                  }
              }
          },
          "headline": {
              "type": "array",
              "items": {
                  "$ref": "#/definitions/point"
              }
          },
          "finish": {
              "type": "array",
              "items": {
                  "$ref": "#/definitions/point"
              },
              "minItems": 2,
              "maxItems": 2
          }
      },
      "required": [
          "walls",
          "headline",
          "finish",
          "max_time",
          "size",
          "cars"
      ]
  }