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Versions: 00 01 02 03 04 05 RFC 5032

                               <WITHIN>                      June 2006

Lemonade
Internet Draft: WITHIN                                       S. H. Maes
Document: draft-ietf-lemonade-search-within-02              R. Cromwell
                                                                   Eds.

Expires: December 2006                                        June 2006


               WITHIN Search extension to the IMAP Protocol

Status of this Memo

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Abstract

   WITHIN is an extension to [RFC3501] SEARCH which returns messages
   whose internal date is within or outside a specified interval and
   differs from SINCE in that an interval in days is specified instead
   of a date. WITHIN is expected to be most useful for persistent
   searches in combination with mobile devices.

Conventions used in this document

   In examples, "C:" and "S:" indicate lines sent by the client and
   server respectively.

   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 [RFC2119].



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                               <WITHIN>                      June 2006


   When describing the general syntax, some definitions are omitted as
   they are defined in [RFC3501].


Table of Contents

   Status of this Memo...............................................1
   Abstract..........................................................1
   Conventions used in this document.................................1
   Table of Contents.................................................2
   1.    Introduction................................................2
   2.    Formal Syntax...............................................2
   3.    Examples....................................................3
   4.    Security Considerations.....................................3
   Normative References..............................................3
   Informative References............................................3
   Future Work.......................................................3
   Version History...................................................3
   Acknowledgments...................................................4
   Authors Addresses.................................................4
   Intellectual Property Statement...................................4
   Full Copyright Statement..........................................5


1. Introduction

   The WITHIN extension is present in any IMAP4 implementation which
   returns "WITHIN" as one of the supported capabilities in the
   CAPABILITY command.

   The extension exposes two new search keys, YOUNGER and OLDER, each of
   which take a non-zero integer argument corresponding to an interval
   in hours.  YOUNGER returns messages deposited in the mailbox after
   the date calculated by subtracting the interval number of hours from
   the server's current date. OLDER returns messages deposited before
   the date calculated as described above.



2. Formal Syntax

   The following syntax specification uses the Augmented Backus-Naur
   Form (ABNF) notation.  Elements not defined here can be found in
   the formal syntax of the [ABNF], [RFC3501], and [ABNFEXTEND].

   The ABNF grammar in [RFC3501] is hereby modified with two new search
   keys: OLDER <interval hours> and YOUNGER <interval hours>




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      search-key /= "OLDER" SP nz-number / "YOUNGER" SP nz-number
                       ; search-key defined in [RFC3501]

3. Examples

   C: a1 SEARCH UNSEEN YOUNGER 72
   S: a1 * SEARCH 4 8 15 16 23 42

   Search for all unseen messages within the past 3 days (72 hours)
   according to the server’s current time.


4. Security Considerations

   The WITHIN extension does not raise any security considerations which
   are not present in the base protocol. Considerations are the same as
   for IMAP [RFC 3501].


Normative References

   [ABNF] D. Crocker, et al. "Augmented BNF for Syntax Specifications:
      ABNF", RFC 2234, November 1997.
      http://www.ietf.org/rfc/rfc2234

   [ABNFEXTEND] Melnikov, A., and C. Daboo, "Collected extensions to
   IMAP4 ABNF", RFC 4466, April 2006.

   [RFC3501] Crispin, M. "IMAP4, Internet Message Access Protocol
      Version 4 rev1", RFC 3501, March 2003.
      http://www.ietf.org/rfc/rfc3501


Informative References

   [P-IMAP] Maes, S.H., Lima R., Kuang, C., Cromwell, R., Ha, V. and
   Chiu, E., Day, J., Ahad R., Jeong W-H., Rosell G., Sini, J., Sohn S-
   M., Xiaohui F. and Lijun Z., "Push Extensions to the IMAP Protocol
   (P-IMAP)", draft-maes-lemonade-p-imap-xx.txt, (work in progress).


Future Work

   [Note to RFC editor: please delete this section before publication]

   [1] Decide whether other interval units are necessary.

Version History



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   [Note to RFC editor: please delete this section before publication]

   Release 00
      Initial release, separated from VFOLDER draft

   Release 01
      Incorporate feedback and suggestions received from Arnt
   Gulbrandsen.

   Release 02
      Interval now defined as hours instead of days as per interim
   meeting consensus.

Acknowledgments

   The authors want to thank all who have contributed key insight and
   extensively reviewed and discussed the concepts of LPSEARCH and the
   authors of its early introduction P-IMAP [P-IMAP].

   We also want to give a special thanks to A. Melnikov and A.
   Gulbrandsen for their review and suggestions.

Authors Addresses

   Stephane H. Maes
   Oracle Corporation
   500 Oracle Parkway
   M/S 4op634
   Redwood Shores, CA 94065
   USA
   Phone: +1-650-607-6296
   Email: stephane.maes@oracle.com


   Ray Cromwell
   Oracle Corporation
   500 Oracle Parkway
   Redwood Shores, CA 94065
   USA



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