Support for Icalendar Relationships
draft-douglass-ical-relations-03

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Network Working Group                                        M. Douglass
Internet-Draft                                                       RPI
Intended status: Standards Track                      September 26, 2014
Expires: March 30, 2015

                  Support for Icalendar Relationships
                    draft-douglass-ical-relations-03

Abstract

   This specification updates RELATED-TO and introduces new iCalendar
   properties LINK and RELATED-ID to allow better linking and grouping
   of iCalendar components and related data.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on March 30, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Structured iCalendar relationships  . . . . . . . . . . .   3
     1.2.  Grouped iCalendar relationships . . . . . . . . . . . . .   3
     1.3.  Linked relationships  . . . . . . . . . . . . . . . . . .   3
     1.4.  Caching and offline use . . . . . . . . . . . . . . . . .   4
     1.5.  Conventions Used in This Document . . . . . . . . . . . .   4
   2.  Qualified Name Syntax . . . . . . . . . . . . . . . . . . . .   4
   3.  Reference Types . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Link Relation Types . . . . . . . . . . . . . . . . . . . . .   5
   5.  Redefined Relation Type Value . . . . . . . . . . . . . . . .   5
   6.  New Property Parameters . . . . . . . . . . . . . . . . . . .   8
     6.1.  Rel . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.2.  Gap . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     6.3.  Title . . . . . . . . . . . . . . . . . . . . . . . . . .   9
   7.  New Parameter Values  . . . . . . . . . . . . . . . . . . . .  10
   8.  New Properties  . . . . . . . . . . . . . . . . . . . . . . .  10
     8.1.  Link  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     8.2.  Refid . . . . . . . . . . . . . . . . . . . . . . . . . .  11
   9.  Redefined RELATED-TO Property . . . . . . . . . . . . . . . .  13
     9.1.  RELATED-TO  . . . . . . . . . . . . . . . . . . . . . . .  13
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  15
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   13. Normative References  . . . . . . . . . . . . . . . . . . . .  15
   Appendix A.  Change log . . . . . . . . . . . . . . . . . . . . .  16
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   Icalendar entities often need to be related to each other or to
   associated meta-data.  These relationships can take the following
   forms

   Structured iCalendar:  Icalendar entities are related to each other
      in some structured way, for example as parent, sibling, before,
      after.

   Grouped iCalendar:  Icalendar entities are related to each other as a
      group.  CATEGORIES are often used for this purpose but are
      problematic for application developers.

   Linked:  Icalendar entities and non-iCalendar entities are linked to
      each other.

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1.1.  Structured iCalendar relationships

   The currently existing iCalendar [RFC5545] RELATED-TO property has no
   support for temporal relationships as used by standard project
   management tools.

   The RELTYPE parameter is extended to take new values defining