[CalendarServer-dev] Unknown attributes for collections

Hi, I'm planning to add more APIs to ical4j-connector and right now, I'm looking at all of the properties of calendar, card and principals collections. But I didn't find a description of some attributes, and they are all attributes from CalendarServer/iCal Server. Does someone knows what the following attributes are for? max-resources pushkey auto-schedule (I found the description in an email, but I didn't find anything in doc/Extensions) auto-schedule-mode email-address-set expanded-group-member-set expanded-group-membership first-name last-name record-type Thanks.