Try out our new RRULE tool for creating RRULE compatible strings.
is-not-defined
urn
Specifies that a match should occur if the enclosing component, property, or parameter does not exist.
The CALDAV match occurs if the enclosing component, property, or parameter value specified in a calendaring REPORT request does not exist in the calendar data being tested.
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The iCalendar Validator provides developers and testers a method to validate their iCalendar feeds, which can take data from either a URL, file or text snippet and compare it against the RFC 5545 specification. We believe we have one of the best iCalendar validation tools available on the internet. More information about the validator can be found here.