4.2. Processing "Attendee" Replies
For a scheduling message reply sent by an "Attendee", the server first locates the corresponding scheduling object resource belonging to the "Organizer". If the corresponding scheduling object resource cannot be found, the server SHOULD ignore the scheduling message.
The server MUST then update the "PARTSTAT" iCalendar property parameter value of each "ATTENDEE" iCalendar property in the scheduling object resource to match the changes indicated in the reply (taking into account the fact that an "Attendee" could have created a new overridden iCalendar component to indicate different participation status on one or more instances of a recurring event).
The server MUST also update or add the "SCHEDULE-STATUS" property parameter on each matching "ATTENDEE" iCalendar property and set its value to that of the "REQUEST-STATUS" property in the reply, or to "2.0" if "REQUEST-STATUS" is not present (also taking into account recurrence instances). If there are multiple "REQUEST-STATUS" properties in the reply, the "SCHEDULE-STATUS" property parameter value is set to a comma-separated list of status codes, one from each "REQUEST-STATUS" property.
The server SHOULD send scheduling messages to all the other "Attendees" indicating the change in participation status of the "Attendee" replying, subject to the recurrence requirements of Section 3.2.6.
The scheduling message MUST only appear in the "Organizer's" scheduling Inbox collection once all automatic processing has been done.
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