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iCalendar Timezone Problems and Recommendations
1. Why do we need time zones?

1.2. Should a `VCALENDAR` object contain whole `VTIMEZONE` objects or reference to a time zone?

Here are some arguments for having a whole VTIMEZONE object inside a VCALENDAR object instead of just a reference to an external time zone definition:

1.2. Should a VCALENDAR object contain whole VTIMEZONE objects or reference to a time zone?

1.2. Should a `VCALENDAR` object contain whole `VTIMEZONE` objects or reference to a time zone?