Relationship between Meetings and Appointments, compared to MAPI/CDO

In MAPI/CDO, there’s the notion that every Meeting has an associated Appointment. So there are two separate items: MeetingItem and AppointmentItem. The MeetingItem represents a meeting request and it’s AppointmentItem represents the actual appointment item in the calendar…

Is there such a correlation in the Notes/Domion architecture? Or are they two separate types with no such relationship? Any suggestions on where I could find documents describing the existence of or lack of would be appreciated.

Jay