{
  "id": "references",
  "name": "References (Email Header)",
  "status": "stable",
  "doc": "Value of the References header of an email message (RFC 5322, section 3.6.4): the Message-IDs of the earlier messages of the thread, separated by whitespace. A reply copies the References of the message it answers and appends that message's Message-ID, so mail clients can rebuild a thread even when some of its messages are missing.",
  "categories": [
    {
      "id": "internet",
      "name": "Internet"
    }
  ],
  "langs": [
    {
      "id": "common",
      "name": "Common to most languages"
    }
  ],
  "is_pii": false,
  "classification": "identifier",
  "regexp": "^<[^<>@\\s]+@[^<>@\\s]+>(?:\\s+<[^<>@\\s]+@[^<>@\\s]+>)*$",
  "examples": [
    {
      "value": "<1234@local.machine.example> <3456@example.net>",
      "description": "Second reply of the thread in RFC 5322, appendix A.2"
    },
    {
      "value": "<1234@local.machine.example>",
      "description": "First reply of the thread in RFC 5322, appendix A.2"
    },
    {
      "value": "1234@local.machine.example, 3456@example.net",
      "valid": false,
      "description": "No angle brackets"
    }
  ],
  "links": [
    {
      "type": "wikipedia",
      "url": "https://en.wikipedia.org/wiki/Message-ID"
    },
    {
      "type": "doc",
      "url": "https://www.rfc-editor.org/rfc/rfc5322.html#section-3.6.4"
    }
  ],
  "translations": {
    "ru": {
      "name": "Заголовок письма References",
      "doc": "Значение заголовка References: Message-ID предыдущих писем цепочки через пробел (RFC 5322)."
    }
  },
  "type": "datatype"
}