Support for iCalendar Relationships
draft-ietf-calext-ical-relations-04

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Network Working Group                                        M. Douglass
Internet-Draft                                       Spherical Cow Group
Updates: 5545 (if approved)                                  May 5, 2018
Intended status: Standards Track
Expires: November 6, 2018

                  Support for iCalendar Relationships
                  draft-ietf-calext-ical-relations-04

Abstract

   This specification updates RELATED-TO defined in [RFC5545] and
   introduces new iCalendar properties LINK, CONCEPT and REFID 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.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 6, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   the Trust Legal Provisions and are provided without warranty as
   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.  Concept relationships . . . . . . . . . . . . . . . . . .   3
     1.4.  Linked relationships  . . . . . . . . . . . . . . . . . .   4
     1.5.  Caching and offline use . . . . . . . . . . . . . . . . .   5
     1.6.  Conventions Used in This Document . . . . . . . . . . . .   5
   2.  Reference Types . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Link Relation Types . . . . . . . . . . . . . . . . . . . . .   5
   4.  Redefined Relation Type Value . . . . . . . . . . . . . . . .   5
   5.  New Property Parameters . . . . . . . . . . . . . . . . . . .   8
     5.1.  Rel . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     5.2.  Gap . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
   6.  New Value Data Types  . . . . . . . . . . . . . . . . . . . .   9
   7.  New Properties  . . . . . . . . . . . . . . . . . . . . . . .  10
     7.1.  Concept . . . . . . . . . . . . . . . . . . . . . . . . .  10
     7.2.  Link  . . . . . . . . . . . . . . . . . . . . . . . . . .  11
     7.3.  Refid . . . . . . . . . . . . . . . . . . . . . . . . . .  13
   8.  Redefined RELATED-TO Property . . . . . . . . . . . . . . . .  13
     8.1.  RELATED-TO  . . . . . . . . . . . . . . . . . . . . . . .  14
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
     10.1.  iCalendar Property Registrations . . . . . . . . . . . .  16
     10.2.  iCalendar Property Parameter Registrations . . . . . . .  16
     10.3.  iCalendar Value Data Type Registrations  . . . . . . . .  16
     10.4.  iCalendar RELTYPE Value Registrations  . . . . . . . . .  17
     10.5.  New Reference Type Registration  . . . . . . . . . . . .  17
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  17
   12. Normative References  . . . . . . . . . . . . . . . . . . . .  18
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  19

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:  Entities are linked to each other through typed references.

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