rfc4482.txt

有关IMS SIP及Presence应用的RFC文档包

Network Working Group                                     H. Schulzrinne
Request for Comments: 4482                                   Columbia U.
Category: Standards Track                                      July 2006


  CIPID: Contact Information for the Presence Information Data Format

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 Internet Society (2006).

Abstract

   The Presence Information Data Format (PIDF) defines a basic XML
   format for presenting presence information for a presentity.  The
   Contact Information for the Presence Information Data format (CIPID)
   is an extension that adds elements to PIDF that provide additional
   contact information about a presentity and its contacts, including
   references to address book entries and icons.
























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RFC 4482                         CIPID                         July 2006


Table of Contents

   1. Introduction ....................................................2
   2. Terminology and Conventions .....................................3
   3. CIPID Elements ..................................................3
      3.1. Card Element ...............................................3
      3.2. Display-Name Element .......................................3
      3.3. Homepage Element ...........................................3
      3.4. Icon Element ...............................................4
      3.5. Map Element ................................................4
      3.6. Sound Element ..............................................4
   4. Example .........................................................4
   5. The XML Schema Definition .......................................6
   6. IANA Considerations .............................................7
      6.1. URN Sub-Namespace Registration for .........................7
           'urn:ietf:params:xml:ns:pidf:cipid'
      6.2. Schema Registration for Schema
           'urn:ietf:params:xml:ns:pidf:cipid' ........................7
   7. Internationalization Considerations .............................8
   8. Security Considerations .........................................8
   9. References ......................................................9
      9.1. Normative References .......................................9
      9.2. Informative References ....................................10

1.  Introduction

   Presence information facilitates communication; its usefulness can be
   enhanced by providing basic information about a presentity or
   contact.  This specification describes a basic set of information
   elements that allow a watcher to retrieve additional information
   about a presentity or contact.

   This specification defines extensions to the PIDF [9] Extensible
   Markup Language [7][8][10] (XML) document format.

   We describe elements for providing a "business card", references to
   the homepage, map, representative sound, display name, and an icon.
   This additional presence information can be used in PIDF [9]
   documents, together with Rich Presence Information Data format [11]
   (RPID), future-status [12], and other PIDF extensions.

   All elements extend the <person> or, less commonly, <tuple> element
   in the presence data model [13].  The <tuple> element is only
   extended with Contact Information for the Presence Information Data
   format (CIPID) elements if the information describes a service
   referring to another person that is marked by an RPID <relationship>
   element with a value other than 'self'.  All elements described in
   this document are optional.



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RFC 4482                         CIPID                         July 2006


   RPID and CIPID both provide "rich" presence that goes beyond the
   basic 'open' and 'closed' status information in PIDF.  The presence
   information described in these two documents can be supplied
   independently, although in practice, both will often appear in the
   same PIDF document.  CIPID elements describe the more static aspects
   of somebody's presence information, while RPID focuses on elements
   that will likely change throughout the day.  Thus, CIPID information
   can often be statically configured by the user through the graphical
   user interface of a presence client; this is less likely to be
   sufficient for RPID.

   The namespace URI for these elements defined by this specification is
   a URN [2], using the namespace identifier 'ietf' defined by [4] and
   extended by [6]:

      urn:ietf:params:xml:ns:pidf:cipid

2.  Terminology and Conventions

   The key words MUST, MUST NOT, REQUIRED, SHOULD, SHOULD NOT,
   RECOMMENDED, MAY, and OPTIONAL in this document are to be interpreted
   as described in BCP 14, RFC 2119 [1].

3.  CIPID Elements

   Unless otherwise noted below, each element may only appear at most
   once.

3.1.  Card Element

   The <card> element includes a URI pointing to a business card, e.g.,
   in LDAP Data Interchange Format [15] (LDIF) or vCard [14] format.

3.2.  Display-Name Element

   The <display-name> element includes the name identifying the tuple or
   person that the presentity suggests should be shown by the watcher
   user interface.  It is left to the watcher user interface design to
   choose whether to heed this suggestion or to use some other suitable
   string.  The CIPID information MAY contain multiple display names,
   but only if they are labeled with different 'xml:lang' attributes.
   This allows a Korean-speaking presentity to convey its display name
   in different languages, Latin and Hangul, for example.

3.3.  Homepage Element

   The <homepage> element provides a URI pointing to general information
   about the tuple or person, typically a web home page.



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RFC 4482                         CIPID                         July 2006


3.4.  Icon Element

   The <icon> element provides a URI pointing to an image (icon)
   representing the tuple or person.  The watcher can use this
   information to represent the tuple or person in a graphical user
   interface.  Presentities SHOULD provide images of sizes and aspect
   ratios that are appropriate for rendering as an icon.  Support for
   JPEG, PNG, and GIF formats is REQUIRED.

3.5.  Map Element

   The <map> element provides a URI pointing to a map related to the
   tuple or person.  The watcher can use this information to represent
   the tuple or person in a graphical user interface.  The map may be
   either an image, an HTML client-side image map, or a geographical
   information system (GIS) document, e.g., encoded as GML.  Support for
   images formatted as PNG and GIF is REQUIRED.

3.6.  Sound Element

   The <sound> element provides a URI pointing to a sound related to the
   tuple or person.  The watcher MAY use the sound object, such as a
   MIDI or MP3 file, referenced by the URL to inform the watcher that
   the presentity has assumed the status OPEN.  Implementors are advised
   to create user interfaces that provide the watcher with the
   opportunity to choose whether to play such sounds.  Support for
   sounds coded as MPEG-2 Layer 3 (MP3) is RECOMMENDED.  The sound
   object might also be used to indicate how to pronounce the
   presentity's name.

4.  Example

   An example using CIPID only is shown below:

   <?xml version="1.0" encoding="UTF-8"?>
   <presence xmlns="urn:ietf:params:xml:ns:pidf"
        xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model"
        xmlns:c="urn:ietf:params:xml:ns:pidf:cipid"
        entity="pres:[e-mail]">

     <tuple id="bs35r9">
       <status>
         <basic>open</basic>
       </status>
       <contact priority="0.8">im:[e-mail]</contact>
       <timestamp>2005-11-21T16:14:29Z</timestamp>
     </tuple>




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RFC 4482                         CIPID                         July 2006


     <dm:person id="p1">
       <c:card>http://example.com/~alice/card.vcd</c:card>
       <c:display-name>Alice Lewis</c:card>
       <c:homepage>http://example.com/~alice</c:homepage>
       <c:icon>http://example.com/~alice/me.png</c:icon>
       <c:map>http://example.com/~alice/gml-map.xml</c:map>
       <c:sound>http://example.com/~alice/hello.wav</c:sound>
       <dm:timestamp>2005-11-21T09:00:00+05:00</dm:timestamp>
     </dm:person>
   </presence>

   An example combining RPID and CIPID is shown below:

   <?xml version="1.0" encoding="UTF-8"?>
   <presence xmlns="urn:ietf:params:xml:ns:pidf"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model"
   xmlns:c="urn:ietf:params:xml:ns:pidf:cipid"
   xmlns:r="urn:ietf:params:xml:ns:pidf:rpid"
   xsi:schemaLocation="urn:ietf:params:xml:ns:pidf pidf.xsd
   urn:ietf:params:xml:ns:pidf:data-model data-model.xsd
   urn:ietf:params:xml:ns:pidf:cipid cipid.xsd
   urn:ietf:params:xml:ns:pidf:rpid rpid.xsd"
   entity="pres:[e-mail]">

     <tuple id="bs35r9">
       <status>
         <basic>open</basic>
       </status>
       <contact priority="0.8">im:[e-mail]</contact>
       <timestamp>2005-05-30T22:00:29Z</timestamp>
     </tuple>

     <tuple id="bs78">
       <status>
          <basic>closed</basic>
       </status>
       <r:relationship><r:assistant/></r:relationship>
       <c:card>http://example.com/~assistant/card.vcd</c:card>
       <c:homepage>http://example.com/~assistant</c:homepage>
       <contact priority="0.1">im:[e-mail]</contact>
       <timestamp>2005-05-30T22:00:29Z</timestamp>
     </tuple>

     <dm:person id="p1">
       <c:card>http://example.com/~someone/card.vcd</c:card>
       <c:homepage>http://example.com/~someone</c:homepage>
       <c:icon>http://example.com/~someone/icon.gif</c:icon>



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RFC 4482                         CIPID                         July 2006


       <c:map>http://example.com/~someone/gml-map.xml</c:map>
       <c:sound>http://example.com/~someone/whoosh.wav</c:sound>
       <dm:timestamp>2005-05-30T22:02:44+05:00</dm:timestamp>
     </dm:person>
   </presence>

5.  The XML Schema Definition

   The schema is shown below.

   <?xml version="1.0" encoding="UTF-8"?>
   <xs:schema targetNamespace="urn:ietf:params:xml:ns:pidf:cipid"
       xmlns:cipid="urn:ietf:params:xml:ns:pidf:cipid"
       xmlns:xs="http://www.w3.org/2001/XMLSchema"
       elementFormDefault="qualified"
       attributeFormDefault="unqualified">

     <xs:annotation>
       <xs:documentation>
         Describes CIPID tuple extensions for PIDF.
       </xs:documentation>
     </xs:annotation>

     <xs:element name="card" type="xs:anyURI"/>
     <xs:element name="display-name" type="xs:string"/>