[Kde-pim] iCalendar semantic

[Patrick Ohly]

Hello!

I've got a bug report
(https://bugs.freedesktop.org/show_bug.cgi?id=74342) and (now that I
started running and analyzing them myself) some failing tests around
iCalendar 2.0 semantics. Some of these have been known issues waiting
for some interested developer to deal with, but it seems to be worse
than I thought.

Anyway, the key question is: in the Akonadi architecture, which entity
is responsible for ensuring that a collection of calendar items meets
iCalendar 2.0 semantics? Is it something that resources do or is the
client of Akonadi responsible?

Specific cases that need to be handled:
      * Adding or updating items with some mandatory properties missing,
        like UID - this is the root problem of bug #74342.
      * Adding a new item with the same UID/RECURRENCE-ID combination as
        an already existing one - covered by testInsertTwice, fails with
        Akonadi.

If the user of Akonadi is responsible for ensuring unique UIDs, how can
this be done reliably, taking into account that multiple different
clients may be inserting the same item concurrently?

Bye, Patrick


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