Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence
RFC 6121

Internet Engineering Task Force (IETF)                    P. Saint-Andre
Request for Comments: 6121                                         Cisco
Obsoletes: 3921                                               March 2011
Category: Standards Track
ISSN: 2070-1721

           Extensible Messaging and Presence Protocol (XMPP):
                     Instant Messaging and Presence

Abstract

   This document defines extensions to core features of the Extensible
   Messaging and Presence Protocol (XMPP) that provide basic instant
   messaging (IM) and presence functionality in conformance with the
   requirements in RFC 2779.  This document obsoletes RFC 3921.

Status of this Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6121.

Copyright Notice

   Copyright (c) 2011 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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   described in the Simplified BSD License.

Saint-Andre                  Standards Track                    [Page 1]
RFC 6121                         XMPP IM                      March 2011

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   5
     1.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   5
     1.2.  History . . . . . . . . . . . . . . . . . . . . . . . . .   5
     1.3.  Requirements  . . . . . . . . . . . . . . . . . . . . . .   5
     1.4.  Functional Summary  . . . . . . . . . . . . . . . . . . .   7
     1.5.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   8
   2.  Managing the Roster . . . . . . . . . . . . . . . . . . . . .   9
     2.1.  Syntax and Semantics  . . . . . . . . . . . . . . . . . .   9
       2.1.1.  Ver Attribute . . . . . . . . . . . . . . . . . . . .  10
       2.1.2.  Roster Items  . . . . . . . . . . . . . . . . . . . .  10
         2.1.2.1.  Approved Attribute  . . . . . . . . . . . . . . .  10
         2.1.2.2.  Ask Attribute . . . . . . . . . . . . . . . . . .  10
         2.1.2.3.  JID Attribute . . . . . . . . . . . . . . . . . .  11
         2.1.2.4.  Name Attribute  . . . . . . . . . . . . . . . . .  11
         2.1.2.5.  Subscription Attribute  . . . . . . . . . . . . .  11
         2.1.2.6.  Group Element . . . . . . . . . . . . . . . . . .  12
       2.1.3.  Roster Get  . . . . . . . . . . . . . . . . . . . . .  12
       2.1.4.  Roster Result . . . . . . . . . . . . . . . . . . . .  13
       2.1.5.  Roster Set  . . . . . . . . . . . . . . . . . . . . .  14
       2.1.6.  Roster Push . . . . . . . . . . . . . . . . . . . . .  14
     2.2.  Retrieving the Roster on Login  . . . . . . . . . . . . .  16
     2.3.  Adding a Roster Item  . . . . . . . . . . . . . . . . . .  17
       2.3.1.  Request . . . . . . . . . . . . . . . . . . . . . . .  17
       2.3.2.  Success Case  . . . . . . . . . . . . . . . . . . . .  17
       2.3.3.  Error Cases . . . . . . . . . . . . . . . . . . . . .  18
     2.4.  Updating a Roster Item  . . . . . . . . . . . . . . . . .  22
       2.4.1.  Request . . . . . . . . . . . . . . . . . . . . . . .  22
       2.4.2.  Success Case  . . . . . . . . . . . . . . . . . . . .  24
       2.4.3.  Error Cases . . . . . . . . . . . . . . . . . . . . .  24
     2.5.  Deleting a Roster Item  . . . . . . . . . . . . . . . . .  24
       2.5.1.  Request . . . . . . . . . . . . . . . . . . . . . . .  24
       2.5.2.  Success Case  . . . . . . . . . . . . . . . . . . . .  25
       2.5.3.  Error Cases . . . . . . . . . . . . . . . . . . . . .  26
     2.6.  Roster Versioning . . . . . . . . . . . . . . . . . . . .  26
       2.6.1.  Stream Feature  . . . . . . . . . . . . . . . . . . .  26
       2.6.2.  Request . . . . . . . . . . . . . . . . . . . . . . .  26
       2.6.3.  Success Case  . . . . . . . . . . . . . . . . . . . .  27
   3.  Managing Presence Subscriptions . . . . . . . . . . . . . . .  30