Support for Series in iCalendar
draft-ietf-calext-icalendar-series-00

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Network Working Group                                        M. Douglass
Internet-Draft                                       Spherical Cow Group
Updates: 5545 (if approved)                             October 30, 2019
Intended status: Standards Track
Expires: May 2, 2020

                    Support for Series in iCalendar
                 draft-ietf-calext-icalendar-series-00

Abstract

   This specification updates [RFC5545] by defining a new repeating set
   of events known as a series.  This differs from recurrences in that
   each instance is a separate entity with a parent relationship to a
   specified template entity.

Status of This Memo

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   This Internet-Draft will expire on May 2, 2020.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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Douglass                   Expires May 2, 2020                  [Page 1]
Internet-Draft              iCalendar Series                October 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Overrides and iCalendar recurrences . . . . . . . . . . . . .   3
     2.1.  Changing the master start or the recurrence rules . . . .   3
     2.2.  Splitting recurrences . . . . . . . . . . . . . . . . . .   4
   3.  Series  . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Modifying series patterns and splitting . . . . . . . . .   5
     3.2.  The series master . . . . . . . . . . . . . . . . . . . .   5
     3.3.  The series instances  . . . . . . . . . . . . . . . . . .   6
   4.  Redefined Relation Type Value . . . . . . . . . . . . . . . .   6
   5.  New Property Parameters . . . . . . . . . . . . . . . . . . .   9
     5.1.  Split . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.2.  Lookahead count . . . . . . . . . . . . . . . . . . . . .  10
     5.3.  Lookahead period  . . . . . . . . . . . . . . . . . . . .  10
   6.  New Properties  . . . . . . . . . . . . . . . . . . . . . . .  11
     6.1.  Generating Series members . . . . . . . . . . . . . . . .  11
     6.2.  Series UID  . . . . . . . . . . . . . . . . . . . . . . .  12
     6.3.  Series-exception-date . . . . . . . . . . . . . . . . . .  13
     6.4.  Series-date . . . . . . . . . . . . . . . . . . . . . . .  14
     6.5.  Series-id . . . . . . . . . . . . . . . . . . . . . . . .  16
     6.6.  Last series id  . . . . . . . . . . . . . . . . . . . . .  17
     6.7.  Series Rule . . . . . . . . . . . . . . . . . . . . . . .  19
     6.8.  SITEM-STATUS Property . . . . . . . . . . . . . . . . . .  21
   7.  Redefined RELATED-TO Property . . . . . . . . . . . . . . . .  21
     7.1.  RELATED-TO  . . . . . . . . . . . . . . . . . . . . . . .  21
   8.  Backwards compatibility . . . . . . . . . . . . . . . . . . .  23
   9.  CalDAV extensions . . . . . . . . . . . . . . . . . . . . . .  24
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  24
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  24
     11.1.  iCalendar Property Registrations . . . . . . . . . . . .  24
     11.2.  iCalendar Property Parameter Registrations . . . . . . .  25
     11.3.  iCalendar RELTYPE Value Registrations  . . . . . . . . .  25
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  25
   13. Normative References  . . . . . . . . . . . . . . . . . . . .  26
   Appendix A.  Points for discussion  . . . . . . . . . . . . . . .  26
   Appendix B.  Change log . . . . . . . . . . . . . . . . . . . . .  27
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  27

1.  Introduction

   Since iCalendar was first defined there has been only one standard
   way to express a repeating set of events - the recurrence.  This