General XFB specification available?

Hi everyone.

In an effort to enable the Evolution PIM suite to use
Kolab as a groupware server, the evolution-kolab team
has created a plugin for Evolution [0].

The plugin has seen considerable functional polishing
and extension for the 3.6 series of GNOME. Among the
functional extensions is the ability to read and display
extended free/busy information (XFB).

Some of the XFB (displaying) code needs to be incorporated
directly into Evolution. That code is not yet published,
but it will be shortly after receiving some more testing.

While talking with the upstream Evolution developers
about how to best incorporate my work into Evolution,
the question was brought up if there was any specification
of XFB available on the net anywhere.

My searches so far have always led to Kolab sites or
list postings, and aside from the Kolab storage format,
specifying how XFB is stored on the Kolab server, I
have not found anything else (like, e.g. reserving
X-SUMMARY and X-LOCATION for the purpose of XFB in a
vfreebusy icalendar property - but then again, X-*
properties are vendor-specific ones).

The Evolution developers are concerned about making
general Free/Busy code too much Kolab-specific, so
if you could provide any pointers to general XFB
information (wich I could e.g. reference in the
code dealing with XFB), that would be very helpful.

Kind regards,

	Christian


[0] https://live.gnome.org/Evolution/Kolab

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