LoCal is going to use XML for communication between server and clients (phones). I just wrote the first "official" schema v0.1!! Still needs to be discussed. Can be found at: http://docs.google.com/Doc?id=dcg2bwzv_37tv2nt7fd
UPDATE (5-2-08): New LoCalXML schema posted. v0.2: http://docs.google.com/Doc?id=dcg2bwzv_38f7vbv9hc
