[Kde-pim] Recurring entries in Calendars, with exceptions

[Christian Mollekopf]

On Sunday 18 March 2012 10.21:10 Shaheed Haque wrote:
> David, thanks for confirming; I expect this is based on the notion of
> recurrence that is in RFCs. In principle, I assume that we could
> extend the EXDATE property with an X-param. Could the programming
> model for the RecurrenceRule be extended to support this? I guess
> korganizer would also have to understand the additional semantics, but
> being able to save and restore the data would be a first step.
> 
> Kevin, as I hinted, I suspect this is how Exchange represents things
> internally. Certainly representing the innards in this way would give
> complete flexibility.
> 

The standard way to do this in iCal is not to exclude & add a new Event, but 
to make use of RecurrenceID. This allows to add an event, matching a specific 
date of the recurrence-set using RecurreneceID, to change properties of either 
only that occurrence, or also all future events if THISANDFUTURE is set.

https://tools.ietf.org/html/rfc5545#section-3.8.4.4

Excluding and adding a new event is a bit of a hack because you loose the 
information that the event belongs to the recurrence.

Cheers,
Christian

> 2012/3/18 Kevin Krammer <krammer at kde.org>:
> > On Sunday, 2012-03-18, Shaheed Haque wrote:
> >> Hi,
> >> 
> >> I've been looking into how Exchange handles exceptions to recurring
> >> Calendar entries, and trying to map them to KCalCore. The basic notion
> >> of having an Event with recurrences works fine, but the only support I
> >> see for defining exceptions is to addExRule(RecurrenceRule). This is a
> >> relatively poor fit for Exchange which support changes to the subject,
> >> location and all sorts of other properties. OTOH, an exception in
> >> Exchange has no ability to recur itself, which a RecurrenceRule can
> >> clearly handle.
> >> 
> >> Roughly speaking, an exception in Exchange is a cut-down one-off
> >> Event, rather than a RecurrenceRule.
> >> 
> >> Have I misunderstood how to use what is there, or are there any plans
> >> to change the way exceptions work to allow them to have richer
> >> semantics along the lines that Exchange supports?
> > 
> > Would it be possible to add a recurrence exception so that the usual event
> > does not appear of the specific date and additionally add a new child
> > event for just that date?
> > 
> > Cheers,
> > Kevin
> > 
> > --
> > Kevin Krammer, KDE developer, xdg-utils developer
> > KDE user support, developer mentoring
> > 
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