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This is part of an effort to define an rsvp microformat for marking up rsvp note posted on independent sites about or in-reply-to an Microformats events post. Per the microformats The microformats process:
The only previous RSVP format known is what little is in iCalendar iCalendar RFC 2445.
4.2.17 RSVP Expectation Parameter Name: RSVP Purpose: To specify whether there is an expectation of a favor of a reply from the calendar user specified by the property value. Format Definition: The property parameter is defined by the following notation: rsvpparam = "RSVP" "=" ("TRUE" / "FALSE") ; Default is FALSE
RSVP expectation is just a boolean parameter on the ATTENDEE property which specifies a person attending an event.
iCalendar also has the related Participation Status:
4.2.12 Participation Status Parameter Name: PARTSTAT Purpose: To specify the participation status for the calendar user specified by the property. Format Definition: The property parameter is defined by the following notation: partstatparam = "PARTSTAT" "=" "NEEDS-ACTION" ; Event needs action "ACCEPTED" ; Event accepted "DECLINED" ; Event declined "TENTATIVE" ; Event tentatively accepted "DELEGATED" ; Event delegated ; Default is NEEDS-ACTION
Further explored here: