rsvp-formats

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This is part of an effort to define an rsvp microformat for marking up rsvp notes posted on independent sites about or in-reply-to an event post. Per the microformats process:

• rsvp-examples
• rsvp-formats
• rsvp-brainstorming

Formats

iCalendar

The only previous RSVP format known is what little is in iCalendar RFC2445.

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:

• hcalendar-brainstorming#participation_status