{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "definitions": {
    "city": {
      "type": "string",
      "enum": [
        "Tel Aviv",
        "New York",
        "London"
      ]
    }
  },
  "properties": {
    "address": {
      "type": "object",
      "properties": {
        "streetAddress": {
          "type": "string"
        },
        "city": {
          "$ref": "#/definitions/city"
        }
      },
      "enum": [
        {
          "streetAddress": "21 2nd Street",
          "city": "New York"
        }
      ],
      "required": [
        "streetAddress",
        "city"
      ]
    },
    "phoneNumber": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "location": {
            "type": "string"
          },
          "code": {
            "type": "integer"
          }
        },
        "required": [
          "location",
          "code"
        ]
      }
    },
    "cityOfBirth" : { "$ref"  : "#/definitions/city"}
  },
  "required": [
    "address",
    "phoneNumber"
  ]
}