VALARM Extensions for iCalendar
draft-ietf-calext-valarm-extensions-02
Network Working Group C. Daboo
Internet-Draft Apple
Updates: 5545 (if approved) K. Murchison, Ed.
Intended status: Standards Track Fastmail
Expires: January 14, 2021 July 13, 2020
VALARM Extensions for iCalendar
draft-ietf-calext-valarm-extensions-02
Abstract
This document defines a set of extensions to the iCalendar VALARM
component to enhance use of alarms and improve interoperability
between clients and servers.
Status of This Memo
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Daboo & Murchison Expires January 14, 2021 [Page 1]
Internet-Draft VALARM Extensions July 2020
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions Used in This Document . . . . . . . . . . . . . . 3
3. Extensible syntax for VALARM . . . . . . . . . . . . . . . . 3
4. Alarm Unique Identifier . . . . . . . . . . . . . . . . . . . 5
5. Alarm Related To . . . . . . . . . . . . . . . . . . . . . . 6
6. Alarm Acknowledgement . . . . . . . . . . . . . . . . . . . . 6
6.1. Acknowledged Property . . . . . . . . . . . . . . . . . . 7
7. Snoozing Alarms . . . . . . . . . . . . . . . . . . . . . . . 8
7.1. Relationship Type Property Parameter . . . . . . . . . . 9
8. Alarm Proximity Trigger . . . . . . . . . . . . . . . . . . . 9
8.1. Proximity Property . . . . . . . . . . . . . . . . . . . 10
8.2. Example . . . . . . . . . . . . . . . . . . . . . . . . . 11
9. Security Considerations . . . . . . . . . . . . . . . . . . . 11
10. Privacy Considerations . . . . . . . . . . . . . . . . . . . 11
11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
11.1. Property Registrations . . . . . . . . . . . . . . . . . 12
11.2. Relationship Types Registry . . . . . . . . . . . . . . 12
11.3. Proximity Value Registry . . . . . . . . . . . . . . . . 12
12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 12
13. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
13.1. Normative References . . . . . . . . . . . . . . . . . . 13
13.2. Informative References . . . . . . . . . . . . . . . . . 13
13.3. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Appendix A. Change History (To be removed by RFC Editor before
publication) . . . . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
1. Introduction
The iCalendar [RFC5545] specification defines a set of components
used to describe calendar data. One of those is the "VALARM"
component which appears as a sub-component of "VEVENT" and "VTODO"
components. The "VALARM" component is used to specify a reminder for
an event or task. Different alarm actions are possible, as are
different ways to specify how the alarm is triggered.
As iCalendar has become more widely used and as client-server
protocols such as CalDAV [RFC4791] have become more prevalent,
several issues with "VALARM" components have arisen. Most of these
relate to the need to extend the existing "VALARM" component with new
properties and behaviors to allow clients and servers to accomplish
specific tasks in an interoperable manner. For example, clients
typically need a way to specify that an alarm has been dismissed by a
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