Hi David,
CalDavZAP started (as an internal project) before
the "rrule" project.
We will check that library (functionality and
performance tests) and if it
works as expected (and it's fast enough), we will
replace our internal rrule
processing in future.
And "BYSETPOS and BYWEEKNO RRULES" are currently not
supported
because design is very important for us, and support
for these parameters
looks really terrible in the interface (and read-only
support is a bad idea - we
don't like "half solutions"). This doesn't
mean that we will not support them,
it's only about priorities (e.g. invitation is much
more important for us).
JM