[CalendarServer-dev] Differences between CalendarServer and iCal Server DTD

I'm building a WebObjects framework to talk to CalDAV and I see that both Calendar Server and iCal Server have a XML Namespace for extensions. I found the DTD for Calendar Server here: http://trac.calendarserver.org/projects/calendarserver/browser/ CalendarServer/trunk/twistedcaldav/customxml.py But iCal Server is using a different namespace and I can't find it :- ( I would like to compare the two set of attributes to find differences between them (I know that the iCal one have a "calendar- color" attribute that Calendar Server doesn't have).