{
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "type": {
      "type": "string",
      "enum": [
        "user",
        "agent",
        "service",
        "system"
      ]
    },
    "id": {
      "type": "string",
      "minLength": 1,
      "maxLength": 512,
      "pattern": "^[^\\s]+$"
    }
  },
  "required": [
    "type",
    "id"
  ]
}