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Mobile Recurrence Interoperability Recommendations

2. Recurrence Support Levels for Mobile Devices

2.1. Level 0: Device provides no support for repeating events
2.2. Level 1: Device can handle recurrence rules (i.e. supports RRULE)
2.3. Level 2: Device can handle recurrence rules with exceptions and extra dates (i.e. supports RRULE, RDATE, EXDATE and RECURRENCE-ID)