Does use of xCal persist?

While looking into RDFCalendar and XML representations of calendar data, I 
discovered many posts,  including some from Mozilla calendar and OpenOffice 
developers, which strongly implied that they were using xcal 
(http://www.ietf.org/internet-drafts/draft-ietf-calsch-many-xcal-02.txt), 
yet the draft appears to have expired.

If any of you developers are on this list, can you tell us whether you have 
moved on from xcal,  perhaps to RDFCalendar? Or, have you stayed with xcal 
- in which case, should we try to get another draft going and accepted? Or 
- third case - have you dropped back to iCalendar only?

Tim Hare
Interested Bystander, Non-Inc.