{
  "$id": "https://example.com/types/city/city.json",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "City",
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "description": "The city's name."
    },
    "zipCode": {
      "type": "integer",
      "description": "The zip code.",
      "minimum": 0
    },
    "qualification": {
      "$ref": "qualification.json"
    }
  }
}