/**
 * An Appointment adds a number of components to a generic ScheduledItem.  The
 * StartTime and Duration indicate when the appointment starts and how long it
 * lasts.  RecurringInfo defines if and how the appointment recurs more than
 * once.  The Location is where it is held.  The AppointmentSecurity indicates
 * who can see that the appointment is scheduled.  Priority is how important
 * the appointment is.  RemindInfo indicates if and how the user is reminded of
 * the appointment.  Details are free form text describing any specific
 * appointment details.
 */
abstract class Appointment extends ScheduledItem {
    Time startTime;
    Duration duration;
    RecurringInfo recurringInfo;
    Location location;
    AppointmentSecurity security;
    AppointmentPriority priority;
    RemindInfo remind;
    Text details;
}

/**
 * Like an Appointment, a Meeting adds components to a generic ScheduledItem.
 * A Meeting differs from an Appointment as follows: (1) Security for an
 * appointment includes a private option that is not available for meetings.
 * (2) Meetings have Attendees and Minutes components, Appointments do not.
 */
abstract class Meeting extends ScheduledItem {
    Time startTime;
    Duration duration;
    RecurringInfo recurringInfo;
    Location location;
    MeetingSecurity meetingSecurity;
    AppointmentPriority priority;
    RemindInfo remindInfo;
    Attendees attendees;
    Text Details;
    Text Minutes;
}