caldav, or webdav in general

dear list,

has anyone tried to implement an application similar to google calendar?

i did some research myself and i think a server implementing caldav[1] 
is the best backend choice, as it is already supported in many other 
clients.  however, there's no webdav library in qooxdoo, and a quick 
googling turns out only this [2] library.

the other way is to implement a custom remote procedure set that will 
have zero interoperability, not the way to go, imo.

a webdav backend would also be quite useful when implementing solutions 
like file managers (as in jt-os) as well. there's even a kernel module 
for linux that lets you mount webdav shares :)

so, i think webdav support could be considered for some future qooxdoo 
release. looking at the wide popularity that the webdav protocol has 
enjoyed, and surprisingly little support it managed to get from the 
javascript world, adding it to qooxdoo may be a big plus.

what do you think?

best regards,
burak

ps.
is there a roadmap document anywhere in qooxdoo.org? i could not find 
it, but it could be me.