json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "array",
      "title": "Wangscape tilesets schema",
      "description": "Specifies the contents and locations of Wangscape output tilesets.",
      "items": {
          "title": "Tileset schema",
          "description": "Specifies the terrains, filename, resolution, and tile resolution of a Wangscape output tileset.",
          "type": "object",
          "properties": {
              "resolution": {
                  "title": "Tile resolution schema",
                  "description": "Specifies the resolution of tiles in the tileset.",
                  "type": "array",
                  "items": {
                      "type": "integer",
                      "minimum": 1
                  },
                  "minItems": 2,
                  "maxItems": 2
              },
              "filename": {
                  "title": "Tileset filename schema",
                  "description": "Specifies the filename of the image containing the tileset.",
                  "type": "string"
              },
              "x": {
                  "title": "Tileset x resolution schema",
                  "description": "Specifies the horizontal resolution of the whole tileset.",
                  "type": "integer",
                  "minimum": 1
              },
              "y": {
                  "title": "Tileset y resolution schema",
                  "description": "Specifies the vertical resolution of the whole tileset.",
                  "type": "integer",
                  "minimum": 1
              },
              "terrains": {
                  "type": "array",
                  "title": "Tileset terrains schema",
                  "description": "Specifies the IDs of the terrain types used in the tileset.",
                  "items": {
                      "title": "Terrain ID schema",
                      "description": "Specifies a terrain type.",
                      "type": "string",
                      "pattern": "^[0-9a-zA-Z_-]+$"
                  },
                  "minLength": 2
              }
          },
          "required": [
              "resolution",
              "filename",
              "x",
              "y",
              "terrains"
          ]
      }
  }