RFC 3343 (rfc3343) - Page 1 of 23

The Application Exchange (APEX) Presence Service

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Network Working Group                                            M. Rose
Request for Comments: 3343                  Dover Beach Consulting, Inc.
Category: Experimental                                          G. Klyne
                                                            Nine by Nine
                                                              D. Crocker
                                             Brandenburg InternetWorking
                                                              April 2003


            The Application Exchange (APEX) Presence Service

Status of this Memo

   This memo defines an Experimental Protocol for the Internet
   community.  It does not specify an Internet standard of any kind.
   Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   This memo describes the Application Exchange (APEX) presence service,
   addressed as the well-known endpoint "apex=presence".  The presence
   service is used to manage presence information for APEX endpoints.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Use and Management of Presence Information . . . . . . . . . .  3
   2.1 Update of Presence Information . . . . . . . . . . . . . . . .  3
   2.2 Distribution of Presence Information . . . . . . . . . . . . .  4
   2.3 Distribution of Watcher Information  . . . . . . . . . . . . .  7
   3.  Format of Presence Entries . . . . . . . . . . . . . . . . . . 10
   4.  The Presence Service . . . . . . . . . . . . . . . . . . . . . 11
   4.1 Use of XML and MIME  . . . . . . . . . . . . . . . . . . . . . 12
   4.2 The Subscribe Operation  . . . . . . . . . . . . . . . . . . . 13
   4.3 The Watch Operation  . . . . . . . . . . . . . . . . . . . . . 14
   4.4 The Publish Operation  . . . . . . . . . . . . . . . . . . . . 15
   4.5 The Terminate Operation  . . . . . . . . . . . . . . . . . . . 17
   4.6 The Notify Operation . . . . . . . . . . . . . . . . . . . . . 17
   4.7 The Reply Operation  . . . . . . . . . . . . . . . . . . . . . 18
   5.  Registration: The Presence Service . . . . . . . . . . . . . . 18
   6.  The Presence Service DTD . . . . . . . . . . . . . . . . . . . 18
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 21
       References . . . . . . . . . . . . . . . . . . . . . . . . . . 21



Rose, et al.                  Experimental
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