{
  "type": "object",
  "allOf": [
    { "$ref": "group_link.json" },
    {
      "required": [
        "source"
      ],
      "properties": {
        "source": {
          "type": "object",
          "required": ["id", "full_name", "web_url"],
          "properties": {
            "id": { "type": "integer" },
            "full_name": { "type": "string" },
            "web_url": { "type": "string" }
          },
          "additionalProperties": false
        }
      }
    }
  ]
}