title clients definitions simpleTypes enum array boolean integer null

{
  "title": "clients",
  "definitions": {
    "simpleTypes": {
      "enum": [
        "array",
        "boolean",
        "integer",
        "null",
        "number",
        "object",
        "string"
      ]
    }
  },
  "type": [
    "object"
  ],
  "properties": {
    "id": {
      "type": "integer"
    },
    "first_name": {
      "type": "string"
    },
    "last_name": {
      "type": "string"
    },
    "middle_name": {
      "type": "string"
    },
    "telephone": {
      "type": "string"
    },
    "birthday": {
      "type": "string"
    },
    "email": {
      "type": "string"
    },
    "gender": {
      "type": [
        "boolean",
        "null"
      ]
    }
  }
}