One document matched: draft-saintandre-header-pres-01.xml

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<?rfc toc="yes"?>
<?rfc tocdepth="4"?>
<?rfc symrefs="yes"?>
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<?rfc strict="yes"?>
<rfc category="info" docName="draft-saintandre-header-pres-01" ipr="full3978">

  <front>
    <title abbrev='Presence-ID'>The Presence-ID Header Field</title>
    <author initials="P." surname="Saint-Andre" fullname="Peter Saint-Andre">
      <organization>XMPP Standards Foundation</organization>
      <address>
        <email>stpeter@jabber.org</email>
        <uri>https://stpeter.im/</uri>
      </address>
    </author>
    <date year="2007" month="November" day="7"/>
    <area>Applications</area>
    <keyword>Electronic Mail</keyword>
    <keyword>Email</keyword>
    <keyword>Netnews</keyword>
    <keyword>Presence</keyword>
    <abstract>
      <t>This document defines a header field that enables the author of an email or netnews message to include a Presence URI in the message header block for the purpose of associating the author with an address that provides information about network availability, also known as "presence".</t>
    </abstract>
  </front>

  <middle>

    <section title="Introduction" anchor="intro">
      <t>Several technologies enable entities to share information about their network availability, also known as "presence" <xref target='IMP-REQS'/>.  Such technologies include the Extensible Messaging and Presence Protocol <xref target='XMPP-IM'/> and the Session Initiation Protocol <xref target='SIP-PRES'/>.  To facilitate the exchange of presence information, a URI scheme for presence is defined in <xref target='CPP'/>.</t>
      <t>Because almost all human users of presence systems also use email systems and because many such users also use netnews systems, it can be helpful for such users to specify their presence URIs in the messages they author.  The Presence-ID header field provides a standard location for such information.  This document documents the syntax and implementation of the Presence-ID header field, including the information necessary to register it in the Permanent Message Header Field Registry maintained by the IANA.</t>
    </section>

    <section title="Syntax" anchor="syntax">
      <t>The syntax of the Presence-ID header field is defined below using Augmented Backus-Naur Form (as specified by <xref target="ABNF"/>), where the "PRES-URI" rule is defined in <xref target='CPP'/> and the remaining rules are defined in <xref target='MESSAGE'/>:</t>
      <figure>
        <artwork><![CDATA[
"Presence-ID:" [FWS] PRES-URI *WSP CRLF
        ]]></artwork>
      </figure>
    </section>

    <section title="Implementation" anchor="impl">
      <section title="Inclusion" anchor="impl-inclusion">
        <t>The Presence-ID header field is associated with the author of the message; see <xref target='MESSAGE'/>.  If the "From:" header field contains more than one mailbox, the Presence-ID header field should not be added to the message.  There should be no more than one instance of the Presence-ID header field.</t>
      </section>
      <section title="Generation" anchor="impl-generation">
        <t>For a user whose presence URI is "pres:juliet@example.com", the corresponding Presence-ID header field would be:</t>
        <figure>
          <artwork><![CDATA[
Presence-ID: pres:juliet@example.com
          ]]></artwork>
        </figure>
      </section>
      <section title="Processing" anchor="impl-processing">
        <t>Upon receiving a message containing a Presence-ID header field, a user agent that supports the field should process the field by resolving the presence URI in accordance with the procedures specified in <xref target='CPP'/>.</t>
      </section>
      <section title="Disposition" anchor="impl-disposition">
        <t>A user agent that has processed a Presence-ID header field may provide appropriate interface elements if it has independent information linking the author of the message with the specified presence URI (e.g., via a user-controlled address book or automated directory lookup).  If the user is subscribed to the presence of the author, such interface elements might include an indicator that the author is online and available for communication over a network.</t>
      </section>
    </section>

    <section title='IANA Considerations' anchor="iana">
      <t>In accordance with <xref target="REG"/>, the IANA registers the "Presence-ID" header field in the Permanent Message Header Field Registry.  The registration template is as follows:</t>
      <t><list style='hanging'>
        <t hangText='Header field name:'>Presence-ID</t>
        <t hangText='Applicable protocol:'>mail, netnews</t>
        <t hangText='Status:'>permanent</t>
        <t hangText='Author/Change controller:'>Peter Saint-Andre <mailto:stpeter@jabber.org></t>
        <t hangText='Specification document(s):'>draft-saintandre-header-pres-00 [Note to IANA and RFC Editor: Replace I-D name with RFC XXXX, where "XXXX" is the number of the RFC that results from this specification, if any]</t>
        <t hangText='Related information:'>For detail information regarding presence URIs, refer to RFC 3859.</t>
      </list></t>
    </section>

    <section title='Security Considerations' anchor="sec">
      <t>Message headers are an existing standard and are designed to easily accommodate new types.  Although the Presence-ID header field may be forged, this problem is inherent in Internet email; however, because a forged Presence-ID header field may break automated processing, applications should not depend on the Presence-ID header field to indicate the authenticity of an email message or the identity of its author or sender.  Including the Presence-ID header field among the signer header fields in DomainKeys Identified Mail (DKIM) can help to mitigate against forging of the header (see <xref target='DKIMSIG'/>).</t>
      <t>Advertising presence URIs in message headers may make it easier for malicious users to harvest such URIs and therefore to send unsolicited bulk communications to the users or applications represented by those URIs.  Care should be taken in balancing the benefits of open information exchange against the potential costs of unwanted communication.  An email user agent that is capable of including the Presence-ID header field in outgoing email messages should provide an option for its user to disable inclusion of the Presence-ID header field generally, on a per-recipient basis, and on a per-message basis.</t>
      <t>The security considerations discussed in <xref target="URI"/> and <xref target='CPP'/> may also apply to the Presence-ID message header.</t>
    </section>

  </middle>

  <back>

    <references title="Normative References">

<reference anchor='ABNF'>
<front>
<title>Augmented BNF for Syntax Specifications: ABNF</title>
<author initials='D.' surname='Crocker' fullname='D. Crocker'>
<organization /></author>
<author initials='P.' surname='Overell' fullname='P. Overell'>
<organization /></author>
<date year='2005' month='October' /></front>
<seriesInfo name='RFC' value='4234' />
<format type='TXT' octets='26351' target='ftp://ftp.isi.edu/in-notes/rfc4234.txt' />
</reference>

<reference anchor="CPP">
<front>
<title>Common Profile for Presence (CPP)</title>
<author initials='J.' surname='Peterson' fullname='J. Peterson'>
<organization /></author>
<date year='2004' month='August' /></front>
<seriesInfo name='RFC' value='3859' />
<format type='TXT' octets='30537' target='ftp://ftp.isi.edu/in-notes/rfc3859.txt' />
</reference>

<reference anchor='MESSAGE'>
<front>
<title>Internet Message Format</title>
<author initials='P.' surname='Resnick' fullname='P. Resnick'>
<organization /></author>
<date year='2001' month='April' /></front>
<seriesInfo name='RFC' value='2822' />
<format type='TXT' octets='110695' target='ftp://ftp.isi.edu/in-notes/rfc2822.txt' />
</reference>

    </references>

    <references title="Informative References">

<reference anchor='DKIMSIG'>
<front>
<title>DomainKeys Identified Mail (DKIM) Signatures</title>
<author initials='E.' surname='Allman' fullname='E. Allman'>
<organization /></author>
<author initials='J.' surname='Callas' fullname='J. Callas'>
<organization /></author>
<author initials='M.' surname='Delany' fullname='M. Delany'>
<organization /></author>
<author initials='M.' surname='Libbey' fullname='M. Libbey'>
<organization /></author>
<author initials='J.' surname='Fenton' fullname='J. Fenton'>
<organization /></author>
<author initials='M.' surname='Thomas' fullname='M. Thomas'>
<organization /></author>
<date year='2007' month='May' />
<abstract>
<t>DomainKeys Identified Mail (DKIM) defines a domain-level authentication framework for email using public-key cryptography and key server technology to permit verification of the source and contents of messages by either Mail Transfer Agents (MTAs) or Mail User Agents (MUAs). The ultimate goal of this framework is to permit a signing domain to assert responsibility for a message, thus protecting message signer identity and the integrity of the messages they convey while retaining the functionality of Internet email as it is known today. Protection of email identity may assist in the global control of "spam" and "phishing". [STANDARDS TRACK]</t></abstract></front>
<seriesInfo name='RFC' value='4871' />
<format type='TXT' octets='166054' target='ftp://ftp.isi.edu/in-notes/rfc4871.txt' />
</reference>

<reference anchor="IMP-REQS">
<front>
<title abbrev='Instant Messaging/Presence Protocol'>Instant Messaging / Presence Protocol Requirements</title>
<author initials='M.' surname='Day' fullname='Mark Day'>
<organization>SightPath, Inc.</organization>
<address>
<postal>
<street>135 Beaver Street</street>
<city>Waltham</city>
<region>MA</region>
<code>02452</code>
<country>US</country></postal>
<email>mday@alum.mit.edu</email></address></author>
<author initials='S.' surname='Aggarwal' fullname='Sonu Aggarwal'>
<organization>Microsoft Corporation</organization>
<address>
<postal>
<street>One Microsoft Way</street>
<city>Redmond</city>
<region>WA</region>
<code>98052</code>
<country>US</country></postal>
<email>sonuag@microsoft.com</email></address></author>
<author initials='J.' surname='Vincent' fullname='Jesse Vincent'>
<organization>Into Networks, Inc.</organization>
<address>
<postal>
<street>150 Cambridgepark Drive</street>
<city>Cambridge</city>
<region>MA</region>
<code>02140</code>
<country>US</country></postal>
<email>jesse@intonet.com</email></address></author>
<date month='February' year='2000' />
<abstract>
<t>Presence and Instant Messaging have recently emerged as a new medium of communications over the Internet.  Presence is a means for finding, retrieving, and subscribing to changes in the presence information (e.g.  "online" or "offline") of other users.  Instant messaging is a means for sending small, simple messages that are delivered immediately to online users.</t>
<t>Applications of presence and instant messaging currently use independent, non-standard and non-interoperable protocols developed by various vendors.  The goal of the Instant Messaging and Presence Protocol (IMPP) Working Group is to define a standard protocol so that independently developed applications of instant messaging and/or   presence can interoperate across the Internet.  This document defines a minimal set of requirements that IMPP must meet.</t></abstract></front>
<seriesInfo name='RFC' value='2779' />
<format type='TXT' octets='47420' target='ftp://ftp.isi.edu/in-notes/rfc2779.txt' />
</reference>

<reference anchor='REG'>
<front>
<title>Registration Procedures for Message Header Fields</title>
<author initials='G.' surname='Klyne' fullname='G. Klyne'>
<organization /></author>
<author initials='M.' surname='Nottingham' fullname='M. Nottingham'>
<organization /></author>
<author initials='J.' surname='Mogul' fullname='J. Mogul'>
<organization /></author>
<date year='2004' month='September' />
<abstract>
<t><p>This specification defines registration procedures for the message header fields used by Internet mail, HTTP, Netnews and other applications. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. </p></t></abstract></front>
<seriesInfo name='BCP' value='90' />
<seriesInfo name='RFC' value='3864' />
<format type='TXT' octets='36231' target='ftp://ftp.isi.edu/in-notes/rfc3864.txt' />
</reference>

<reference anchor="SIP-PRES">
<front>
<title>A Presence Event Package for the Session Initiation Protocol (SIP)</title>
<author initials='J.' surname='Rosenberg' fullname='J. Rosenberg'>
<organization /></author>
<date year='2004' month='August' /></front>
<seriesInfo name='RFC' value='3856' />
<format type='TXT' octets='62956' target='ftp://ftp.isi.edu/in-notes/rfc3856.txt' />
</reference>

<reference anchor="URI">
<front>
<title>Uniform Resource Identifier (URI): Generic Syntax</title>
<author initials='T.' surname='Berners-Lee' fullname='T. Berners-Lee'>
<organization /></author>
<author initials='R.' surname='Fielding' fullname='R. Fielding'>
<organization /></author>
<author initials='L.' surname='Masinter' fullname='L. Masinter'>
<organization /></author>
<date year='2005' month='January' /></front>
<seriesInfo name='STD' value='66' />
<seriesInfo name='RFC' value='3986' />
<format type='TXT' octets='141811' target='ftp://ftp.isi.edu/in-notes/rfc3986.txt' />
</reference>

<reference anchor="XMPP-IM">
  <front>
    <title>Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence</title>
    <author initials='P.' surname='Saint-Andre' fullname='P. Saint-Andre'>
      <organization>Jabber Software Foundation</organization>
    </author>
    <date year='2004' month='October' />
  </front>
  <seriesInfo name='RFC' value='3921' />
  <format type='TXT' octets='217527' target='ftp://ftp.isi.edu/in-notes/rfc3921.txt' />
</reference>

    </references>

  </back>

</rfc>