Not everything that has the XML stamp on it is golden. rfc2445 is
quite elaborate, Im sure this is somehow possible (i.e BYSETPOS,
BYDAY). The big problem is rather that its a bitch to implement on
client applications since the calculations are so time consuming. (if
you have a calendar full of birthdays or other infinite rules you have
to expand all such rules to find occurrences on a certain day).

This wont change if rfc2445 is transformed to xml.

As to the original question, you should read the said rfc regarding
BYSETPOS and BYDAY rules.

Philipp

On Jun 25, 5:43 am, Dave <[EMAIL PROTECTED]> wrote:
> RFC 2445 cannot represent a recurrence rule like that, especially the
> subset in use today. Nor can it represent Easter, something which has
> been defined since the Middle Ages.
>
> http://en.wikipedia.org/wiki/Computus
>
> Honestly, I wish we could dump that pre-xml dinosaur.
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