"linkType": {
  "type": "object",
  "additionalProperties": false,
  "title": "The 'link' property",
  "description": "Specifies who is the manager and who are the subordinates for this person.",
  "properties": {
    "subordinates": {
      "type": "array",
      "title": "The 'subordinates' propety",
      "description": "Specifies the ids of the subordinates.",
      "items": {}
    },
    "manager": {"$ref": "#/definitions/idType"}
  }
}

 "subordinates": {
  "type": "array",
  "title": "The 'subordinates' propety",
  "description": "Specifies the ids of the subordinates.",
  "items": {"$ref": "#/definitions/idType"}
}

 "items": {"$ref": "#/definitions/idType"}

 "manager": {"$ref": "#/definitions/idType"}