Extensible Messaging and Presence Protocol

The information below is for an older approved charter
Document Charter Extensible Messaging and Presence Protocol WG (xmpp) Snapshot
Title Extensible Messaging and Presence Protocol
Last updated 2009-05-29
State Approved
WG State Concluded
IESG Responsible AD Ben Campbell
Charter Edit AD (None)
Send notices to (None)


The Extensible Messaging and Presence Protocol (XMPP) is an
  technology for the near-real-time exchange of messages and presence
  notifications, where data is exchanged over Extensible Markup Language
  (XML) streams. The original XMPP working group published RFCs 3920-3923.
  Implementation and deployment experience since that time has resulted
  in errata, clarifications, and suggestions for improvement to the core
  XMPP specifications (RFCs 3920 and 3921). Some technologies on which
  XMPP depends (e.g., Transport Layer Security and the Simple
  Authentication and Security Layer) have undergone modifications of their
  own, which XMPP needs to track. Finally, the group needs to define a
  sustainable solution to internationalization of XMPP addresses, since
  the approach taken in RFC 3920 (based on stringprep profiles) is limited
  to Unicode 3.2 characters. Both draft-saintandre-rfc3920bis-* and
  draft-saintandre-rfc3921bis-* reflect community input so
  far regarding these modifications, but the group needs to complete this
  work, especially with regard to internationalization. Because of the
  scope of changes involved, it is envisioned that these specifications
  will be cycled at Proposed Standard.
  Although RFC 3923 defines an end-to-end signing and encryption
  technology for use by XMPP systems, to date it has not been implemented.
  A goal of the group is to develop an implementable method for end-to-end
  encryption, preferably based on well known and widely deployed security
  XMPP uses TLS for encryption and the Simple Authentication and Security
  Layer (SASL) for authentication. In the case of a server-to-server
  stream, XMPP is deployed using TLS and the SASL EXTERNAL mechanism,
  where each peer presents an X.509 certificate. This model introduces
  scaling challenges in multi-domain deployments because RFC 3920 requires
  that a stream cannot be reused for more than one domain, thus
  necessitating multiple TCP connections. The group will work to overcome
  these challenges by defining an optional mechanism for using a single
  connection with multiple identities. It is anticipated that most of the
  work will consist of defining and providing requirements to the TLS and
  SASL working groups.
  Many of the core and extended features of XMPP have also been
  implemented in technologies based on the Session Initiation Protocol
  (SIP). To ensure interworking between XMPP systems and SIP systems, a
  number of Internet-Drafts (draft-saintandre-sip-xmpp-*) have been
  produced. The group will define a framework within which this work could
  be completed.
  In completing its work, the group will strive to retain backwards
  compatibility with RFCs 3920 and 3921. However, changes that are not
  backwards compatible might be accepted if the group determines that the
  changes are required to meet the group's technical objectives and the
  group clearly documents the reasons for making them.