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Versions: 00 01 02 03 04 05 06 07 08 09 RFC 5064

Network Working Group                                          M. Duerst
Internet-Draft                                                       W3C
Expires: January 17, 2005                                  July 19, 2004


                       The Archived-At Email Header
                       draft-duerst-archived-at-01

Status of this Memo

    By submitting this Internet-Draft, I certify that any applicable
    patent or other IPR claims of which I am aware have been disclosed,
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    This Internet-Draft will expire on January 17, 2005.

Copyright Notice

    Copyright (C) The Internet Society (2004). All Rights Reserved.

Abstract

    This memo defines a new email header, Archived-At:, to provide a
    direct link to the archived form of an individual mail message.












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Table of Contents

    1.   Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
    2.   Syntax Definition  . . . . . . . . . . . . . . . . . . . . . . 3
    3.   Supporting Nested Lists  . . . . . . . . . . . . . . . . . . . 3
    4.   Implementation Considerations  . . . . . . . . . . . . . . . . 3
    5.   Security Considerations  . . . . . . . . . . . . . . . . . . . 4
    6.   IANA considerations  . . . . . . . . . . . . . . . . . . . . . 4
    7.   Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 4
    8.   References . . . . . . . . . . . . . . . . . . . . . . . . . . 4
         Author's Address . . . . . . . . . . . . . . . . . . . . . . . 5
         Intellectual Property and Copyright Statements . . . . . . . . 6







































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1.  Introduction

    [RFC2369] defines a number of header fields that can be added to
    email messages send by email distribution lists. One of them is the
    'List-Archive' header field that describes how to access archives for
    the list. This allows to access the archives as a whole, but not the
    individual message.

    There is often a need or desire to refer to the archived form of a
    single message. This memo defines a new header, 'Archived-At', to
    refer to a single message in an archive.

2.  Syntax Definition

    The name of the header field is 'Archived-At'. The content of the
    header field is an URI [RFC2369] pointing to an archived version of
    the message.

    This header field is subject to the encoding and character
    restrictions for mail headers as described in [RFC2822].
    Additionally, the URI content is further restricted to the set of URI
    safe characters [RFC2396].

    This syntax is kept very simple on purpose, it does not allow
    comments, nor does the URI have to be enclosed with '<' and '>'. In
    this points, the syntax is different from [RFC2369].

3.  Supporting Nested Lists

    If a message is forwarded from a list to a sublist, and both lists
    support adding the Archived-At header field, then the sublist should
    add a new Archived-At header field without removing the already
    existing one(s).

4.  Implementation Considerations

    This section shortly discusses some implementation considerations.
    Mailing list expanders and email archives are often separate pieces
    of software. This may make it difficult for the mailing list expander
    to create an 'Archived-At' header field.

    W3C uses a setup that allows to use the message id of the incoming
    mail, combined with a lookup in a database and HTTP redirection, to
    find the actual message. As an example, the URI
    "http://www.w3.org/mid/1057271304.16158.44.camel@dirk.dm93.org",
    containing the message id
    "1057271304.16158.44.camel@dirk.dm93.org", is redirected to the usual
    mailing-list archive URI at



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    http://lists.w3.org/Archives/Public/public-ietf-w3c/2003Jul/
    0000.html.

    When using the message id to create an address for the archived mail,
    care has to be taken to escape characters in the message id that are
    not allowed in the URI.

    Depending on the URI scheme for the URI used, the message can be made
    available in more than one format. As an example, a HTTP URI can make
    use of content negotiation to for example serve the message both as
    text/html for human consumption in a browser and as message/rfc822
    [RFC2046] for use by a mail user agent without loss of information.

5.  Security Considerations

    There are many potential security issues when activating and
    dereferencing an URI. For more details, please see [RFC2396].

6.  IANA considerations

    Currently, there is no IANA registry for header fields. If and when
    there is such a registry, the Archived-At header will have to be
    registered.

7.  Acknowledgements

    The members of the W3C system team, in particular Gerald Oskoboiny,
    Olivier Thereaux, and Jose Kahan, created the mid-based email archive
    lookup system and the experimental form of the Archived-At header.
    Pete Resnik provided the motivation for writing up this draft.

8  References

    [RFC2046]  Freed, N. and N. Borenstein, "Multipurpose Internet Mail
               Extensions (MIME) Part Two: Media Types", RFC 2046,
               November 1996.

    [RFC2369]  Baer, J. and G. Neufeld, "The Use of URLs as Meta-Syntax
               for Core Mail List Commands and their Transport through
               Message Header Fields", RFC 2369, July 1998.

    [RFC2396]  Berners-Lee, T., Fielding, R. and L. Masinter, "Uniform
               Resource Identifiers (URI): Generic Syntax", RFC 2396,
               August 1998.

    [RFC2822]  Resnick, P., "Internet Message Format", RFC 2822, April
               2001.




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Author's Address

    Martin Duerst (Note: Please write "Duerst" with u-umlaut wherever
                   possible, for example as "Durst in XML and HTML.)
    World Wide Web Consortium
    200 Technology Square
    Cambridge, MA  02139
    U.S.A.

    Phone: +1 617 253 5509
    Fax:   +1 617 258 5999
    EMail: duerst@w3.org
    URI:   http://www.w3.org/People/D%C3%BCrst/






































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Intellectual Property Statement

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Acknowledgment

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    Internet Society.




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