eat-api CanteenMenu

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/tum/main/json-schema/tum-canteen-menu-schema.json",
  "title": "eat-api CanteenMenu",
  "description": "A weekly canteen menu returned by the eat-api static JSON API.",
  "type": "object",
  "required": ["number", "year", "days"],
  "properties": {
    "version": { "type": "string", "description": "Schema/version identifier of the API." },
    "canteen_id": { "type": "string", "description": "Identifier of the canteen, e.g. mensa-garching." },
    "number": { "type": "integer", "description": "ISO week number." },
    "year": { "type": "integer", "description": "Calendar year." },
    "weeks": {
      "type": "array",
      "items": { "$ref": "#/$defs/Week" }
    },
    "days": {
      "type": "array",
      "items": { "$ref": "#/$defs/Day" }
    }
  },
  "$defs": {
    "Week": {
      "type": "object",
      "required": ["number", "year", "days"],
      "properties": {
        "number": { "type": "integer" },
        "year": { "type": "integer" },
        "days": { "type": "array", "items": { "$ref": "#/$defs/Day" } }
      }
    },
    "Day": {
      "type": "object",
      "required": ["date", "dishes"],
      "properties": {
        "date": { "type": "string", "format": "date" },
        "dishes": { "type": "array", "items": { "$ref": "#/$defs/Dish" } }
      }
    },
    "Dish": {
      "type": "object",
      "required": ["name", "prices", "labels", "dish_type"],
      "properties": {
        "name": { "type": "string" },
        "prices": { "$ref": "#/$defs/Prices" },
        "labels": { "type": "array", "items": { "type": "string" } },
        "dish_type": { "type": "string" }
      }
    },
    "Prices": {
      "type": "object",
      "properties": {
        "students": { "$ref": "#/$defs/Price" },
        "staff": { "$ref": "#/$defs/Price" },
        "guests": { "$ref": "#/$defs/Price" }
      }
    },
    "Price": {
      "type": "object",
      "properties": {
        "base_price": { "type": "number" },
        "price_per_unit": { "type": "number" },
        "unit": { "type": ["string", "null"] }
      }
    }
  }
}