Support for iCalendar Relationships
draft-ietf-calext-ical-relations-03

Document Type Active Internet-Draft (calext WG)
Last updated 2017-10-11
Replaces draft-douglass-ical-relations
Stream IETF
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Stream WG state WG Document (wg milestone: Jul 2017 - Send iCal relation d... )
Document shepherd Philipp Kewisch
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Network Working Group                                        M. Douglass
Internet-Draft                                       Spherical Cow Group
Updates: 5545 (if approved)                             October 11, 2017
Intended status: Standards Track
Expires: April 14, 2018

                  Support for iCalendar Relationships
                  draft-ietf-calext-ical-relations-03

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
   working documents as Internet-Drafts.  The list of current Internet-
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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   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 April 14, 2018.

Copyright Notice

   Copyright (c) 2017 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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   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
   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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