Tum Canteen Menu Structure

{
  "$schema": "https://json-structure.org/meta/core/v0",
  "$id": "https://raw.githubusercontent.com/api-evangelist/tum/main/json-structure/tum-canteen-menu-structure.json",
  "name": "CanteenMenu",
  "description": "Structure of an eat-api weekly canteen menu.",
  "type": "object",
  "properties": {
    "number": { "type": "int32" },
    "year": { "type": "int32" },
    "days": {
      "type": "array",
      "items": {
        "type": "object",
        "name": "Day",
        "properties": {
          "date": { "type": "string" },
          "dishes": {
            "type": "array",
            "items": {
              "type": "object",
              "name": "Dish",
              "properties": {
                "name": { "type": "string" },
                "dish_type": { "type": "string" },
                "labels": { "type": "array", "items": { "type": "string" } },
                "prices": {
                  "type": "object",
                  "name": "Prices",
                  "properties": {
                    "students": { "$ref": "#/$defs/Price" },
                    "staff": { "$ref": "#/$defs/Price" },
                    "guests": { "$ref": "#/$defs/Price" }
                  }
                }
              },
              "required": ["name", "prices", "labels", "dish_type"]
            }
          }
        },
        "required": ["date", "dishes"]
      }
    }
  },
  "required": ["number", "year", "days"],
  "$defs": {
    "Price": {
      "type": "object",
      "name": "Price",
      "properties": {
        "base_price": { "type": "double" },
        "price_per_unit": { "type": "double" },
        "unit": { "type": ["string", "null"] }
      }
    }
  }
}