["icalendar",
  ["vcalendar",
    [
      [
        "categories",
        {},
        "text",
        "foo",
        "blue, fish",
        "woot"
      ],
      [
        "geo",
        {},
        "float",
        10.10,
        10.05
      ],
      [
        "request-status",
        {},
        "text",
        "3.1",
        "Invalid property value",
        "DTSTART:96-Apr-01"
      ],
      [
        "rdate",
        {},
        "date",
        "2012-10-01",
        "2012-10-02",
        "2012-10-03"
      ],
      [
        "exdate",
        {},
        "date-time",
        "2012-09-01T13:00:00",
        "2012-09-05T13:00:00"
      ]
    ],
    []
  ]
]