IANA Registration for Enumservice 'XMPP'
RFC 4979

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Network Working Group                                       A. Mayrhofer
Request for Comments: 4979                                       enum.at
Category: Standards Track                                    August 2007

                IANA Registration for Enumservice 'XMPP'

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The IETF Trust (2007).

Abstract

   This document requests IANA registration of an Enumservice for XMPP,
   the Extensible Messaging and Presence Protocol.  This Enumservice
   specifically allows the use of 'xmpp' Uniform Resource Identifiers
   (URIs) in the context of E.164 Number Mapping (ENUM).

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 2
   3.  Enumservice Registration - XMPP . . . . . . . . . . . . . . . . 2
   4.  XMPP IRI/URI Considerations for ENUM  . . . . . . . . . . . . . 3
     4.1.  Authority Component . . . . . . . . . . . . . . . . . . . . 3
     4.2.  IRI-to-URI mapping  . . . . . . . . . . . . . . . . . . . . 3
   5.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   6.  Security and Privacy Considerations . . . . . . . . . . . . . . 4
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 4
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     9.1.  Normative References  . . . . . . . . . . . . . . . . . . . 5
     9.2.  Informative References  . . . . . . . . . . . . . . . . . . 5

Mayrhofer                   Standards Track                     [Page 1]
RFC 4979                    XMPP Enumservice                 August 2007

1.  Introduction

   E.164 Number Mapping (ENUM) [1] uses the Domain Name System (DNS) [6]
   to refer from E.164 numbers [7] to Uniform Resource Identifiers
   (URIs) [3].  Specific services to be used with ENUM must be
   registered with IANA.  Section 3 of RFC 3761 describes the process of
   such an Enumservice registration.

   The Extensible Messaging and Presence Protocol (XMPP) [9] provides
   means for streaming Extensible Markup Language (XML) [8] elements
   between endpoints in close to real time.  The XMPP framework is
   mainly used to provide instant messaging, presence, and streaming
   media services.

   RFC 4622 [5] registers a Uniform Resource Identifier (URI) scheme for
   identifying an XMPP entity as a URI or as an Internationalized
   Resource Identifier (IRI) [4].  The Enumservice specified in this
   document allows the provisioning of such "xmpp" URIs (and the URI
   representations of "xmpp" IRIs) in ENUM.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [2].

3.  Enumservice Registration - XMPP

   The following template contains information required for the IANA
   registrations of the 'XMPP' Enumservice, according to Section 3 of
   RFC 3761:

   Enumservice Name: "XMPP"

   Enumservice Type: "xmpp"

   Enumservice Subtype: n/a

   URI Schemes: "xmpp"

   Functional Specification:

      This Enumservice indicates that the resource identified is an XMPP
      entity.

   Security Considerations: see Section 6

Mayrhofer                   Standards Track                     [Page 2]
RFC 4979                    XMPP Enumservice                 August 2007

   Intended Usage: COMMON

   Author: Alexander Mayrhofer <alexander.mayrhofer@enum.at>

4.  XMPP IRI/URI Considerations for ENUM

4.1.  Authority Component

   XMPP IRIs/URIs optionally contain an "Authority Component" (see
   Section 2.3 of RFC 4622).  The presence of such an Authority
   Component in an IRI/URI signals the processing application to
   authenticate as the user indicated in the URI/IRI rather than using
   the preconfigured identity.

   In the context of this Enumservice, arbitrary clients may discover
   and use the XMPP URIs/IRIs associated to an E.164 number.  Hence, in
   most cases, those clients will not be able to authenticate as
   requested in the Authority Component.

   Therefore, URIs/IRIs that result from processing an XMPP Enumservice
   record SHOULD NOT contain an Authority Component.

4.2.  IRI-to-URI mapping

   While XMPP supports IRIs as well as 'plain' URIs, ENUM itself
   supports only the use of URIs for Enumservices.

   Therefore, XMPP IRIs MUST be mapped to URIs for use in an XMPP
   Enumservice record.  The mapping MUST follow the procedures outlined