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Network Working Group                                          C. Daboo
Internet Draft: IMAP ANNOTATEMORE Extension
Document: draft-daboo-imap-annotatemore-00.txt            February 2002

                      IMAP ANNOTATEMORE Extension

Status of this Memo

    This document is an Internet-Draft and is in full conformance with
    all provisions of Section 10 of RFC2026.  Internet-Drafts are
    working documents of the Internet Engineering Task Force (IETF), its
    areas, and its working groups.  Note that other groups may also
    distribute working documents as Internet-Drafts.

    Internet-Drafts are draft documents valid for a maximum of six
    months and may be updated, replaced, or obsoleted by other documents
    at any time.  It is inappropriate to use Internet-Drafts as
    reference material or to cite them other than as "work in progress."

    The list of current Internet-Drafts can be accessed at
    http://www.ietf.org/ietf/1id-abstracts.txt.  The list of Internet-
    Draft Shadow Directories can be accessed at
    http://www.ietf.org/shadow.html.


Copyright Notice

     Copyright (C) The Internet Society 2002. All Rights Reserved.





























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                           Table of Contents
     1  Abstract  . . . . . . . . . . . . . . . . . . . . . . . . . .  2
     2  Conventions Used in This Document  . . . . . . . . . . . . .   2
     3  Open Issues:  . . . . . . . . . . . . . . . . . . . . . . . .  2
     4  Introduction and Overview  . . . . . . . . . . . . . . . . .   3
     5  Data Model  . . . . . . . . . . . . . . . . . . . . . . . . .  3
       5.1  Overview . . . . . . . . . . . . . . . . . . . . . . . .   3
       5.2  Namespace of entries and attributes . . . . . . . . . . .  4
         5.2.1  Entry Names  . . . . . . . . . . . . . . . . . . . .   4
         5.2.2  Attribute Names . . . . . . . . . . . . . . . . . . .  6
     6  Private versus Shared and Access Control . . . . . . . . . .   6
     7  IMAP Protocol Changes . . . . . . . . . . . . . . . . . . . .  7
       7.1  GETANNOTATION Command  . . . . . . . . . . . . . . . . .   7
       7.2  SETANNOTATION command . . . . . . . . . . . . . . . . . .  8
       7.3  ANNOTATION Response  . . . . . . . . . . . . . . . . . .  10
         7.3.1  ANNOTATION response with attributes and values  . . . 10
         7.3.2  Unsolicted ANNOTATION response without attributes and 11
     8  Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . . 11
     9  IANA Considerations  . . . . . . . . . . . . . . . . . . . .  12
       9.1  Entry and Attribute Registration Template . . . . . . . . 13
    10  Security Considerations  . . . . . . . . . . . . . . . . . .  13
    11  References  . . . . . . . . . . . . . . . . . . . . . . . . . 13
    12  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . .  14
    13  Author's Address  . . . . . . . . . . . . . . . . . . . . . . 14

1 Abstract

    The ANNOTATEMORE extension to the Internet Message Access Protocol
    [IMAP4] permits clients and servers to maintain "metadata" on IMAP4
    servers.  This document describes two "profiles" for mailbox and
    server metadata.

2 Conventions Used in This Document

    The key words "REQUIRED", "MUST", "MUST NOT", "SHOULD", "SHOULD
    NOT", and "MAY" in this document are to be interpreted as described
    in "Key words for use in RFCs to Indicate Requirement Levels"
    [KEYWORDS].

    Formal syntax is defined using ABNF [ABNF] as modified by [IMAP4].

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


3 Open Issues:

    1   Handling of failures in SETANNOTATION with multiple mailbox
    entries specified, and at least one fails but others succeed.

    2   Do we want explicit access control for the /server hierarchy,
    beyond simply defining certain attributes as read-only in the spec?


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    3   Should mailbox name in entry use IMAPURL encoding or should it
    be pure UTF8?

    4   SETANNOTATION does not currently implement conditional store
    behaviour.  Do we want this?

    5   Should LIST flags, mailbox referrals, STATUS info be attributes
    of the /mailbox annotations?

    6   Do we want the ability to search for annotations in the /server
    or /mailbox hierarchies?


4 Introduction and Overview

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

    The goal of ANNOTATEMORE is to provide a means for clients to store
    and retrieve "metadata" on an IMAP4 server.  This draft defines
    "profiles" for storing metadata associated with specific mailboxes
    and the server as a whole.

    The ANNOTATEMORE extension adds two new commands and one new
    untagged response to the IMAP4 base protocol.

    This extension makes the following changes to the IMAP4 protocol:

    1   adds a new SETANNOTATION command
    2   adds a new GETANNOTATION command
    3   adds a new ANNOTATION untagged response

    The data model used in ANNOTATEMORE is exactly the same as that used
    in the ANNOTATE [ANNOTATE] extension to IMAP4.  This is modeled
    after that of the Application Configuration Access Protocol [ACAP]
    with the exception of inheritance which is not deemed necessary
    here.

    The rest of this document describes the data model and protocol
    changes more rigorously.


5 Data Model

5.1 Overview

    The data model used in ANNOTATEMORE is one of a uniquely named entry
    with a set of uniquely named attributes, each of which has a value.
    An annotation can contain multiple named entries.  For example, a
    general comment being added to a mailbox may have an entry name of
    "/mailbox/{INBOX}/comment".  This entry could include named


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    attributes such as "value", "modifiedsince", "acl" etc to represent
    properties and data associated with the entry.

    The protocol changes to IMAP described below allow a client to
    access or change the values of any attributes in any entries in a
    message annotation, assuming it has sufficient access rights to do
    so.

5.2 Namespace of entries and attributes

    Each annotation is made up of a set of entries.  Each entry has a
    hierarchical name in UTF-8, with each component of the name
    separated by a slash ("/").

    Each entry is made up of a set of attributes.  Each attribute has a
    hierarchical name in UTF-8, with each component of the name
    separated by a period (".").

    The value of an attribute is NIL (has no value), or a string of zero
    or more octets.

    Entry and attribute names are not permitted to contain asterisk
    ("*") or percent ("%") characters and MUST be valid UTF-8 strings
    which do not contain NUL.  Invalid entry or attribute names result
    in a BAD response in any IMAP commands where they are used.

    Use of non-visible UTF-8 characters in entry and attribute names is
    discouraged.

    This specification defines an initial set of entry and attribute
    names available for use with mailbox and server annotations.  In
    addition an extension mechanism is described to allow additional
    names to be added for extensibility.

5.2.1 Entry Names

    Entry names MUST be specified in a standards track or IESG approved
    experimental RFC, or fall under the vendor namespace.  See Section
    9.1 for the registration template.

    /mailbox
        Defines the top-level of entries associated with mailboxes.
        This entry itself does not have any associated attributes.











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    /mailbox/{<mailbox-name>}
        Defines the top-level of entries associated with a specific
        mailbox.  The <mailbox-name> is the name of the mailbox encoded
        using the mailbox name encoding rules described in the IMAP URL
        standard [IMAPURL].  The mailbox name appears inside
        curly-braces to delimit it from the following levels of entry
        name hierarchy, since it is possible that the mailbox name
        itself contains the '/' characters uses to delimit entry name
        hierarchical components.  This entry itself does not have any
        associated attributes.

    /mailbox/{<mailbox-name>}/comment
        Defines a comment or note associated with a mailbox.

    /mailbox/{<mailbox-name>}/sort
        Defines the default sort criteria [SORT] to use when first
        displaying the mailbox contents to the user, or NIL if sorting
        is not required.

    /mailbox/{<mailbox-name>}/thread
        Defines the default thread criteria [THREAD] to use when first
        displaying the mailbox contents to the user, or NIL if threading
        is not required.  If both sort and thread are not NIL, then
        threading should take precedence over sorting.

    /mailbox/{<mailbox-name>}/check
        Boolean value "true" or "false" that indicates whether this
        mailbox should be checked at regular intervals by the client.
        The interval in minutes is specified by the checkperiod
        attribute.

    /mailbox/{<mailbox-name>}/checkperiod
        Numeric value indicating a period of minutes to use for checking
        a mailbox that has the check attribute set to "true".

    /mailbox/{<mailbox-name>}/vendor/<vendor-token>
        Defines the top-level of entries associated with a specific
        mailbox as created by a particular product of some vendor.  This
        entry can be used by vendors to provide client specific
        attributes.  The vendor-token MUST be registered with IANA.

    /server
        Defines the top-level of entries associated with the server.
        This entry itself does not have any associated attributes.

    /server/comment
        Defines a comment or note associated with the server.

    /server/motd
        Defines a "message of the day" for the server.  This entry is
        always read-only - clients cannot change it.



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    /server/admin
        Indicates a method for contacting the server administrator.
        This may be a URL (e.g. a mailto URL) or other contact
        information, such as a telephone number.  This entry is always
        read-only - clients cannot change it.

    /server/vendor/<vendor-token>
        Defines the top-level of entries associated with the server as
        created by a particular product of some vendor.  This entry can
        be used by vendors to provide server or client specific
        attributes.  The vendor-token MUST be registered with IANA.


5.2.2 Attribute Names

    Attribute names MUST be specified in a standards track or IESG
    approved experimental RFC, or fall under the vendor namespace.  See
    Section 9.1 for the registration template.

    All attribute names implicitly have a ".priv" and a ".shared" suffix
    which maps to private and shared versions of the entry.  Searching
    or fetching without using either suffix includes both.  The client
    MUST specify either a ".priv" or ".shared" suffix when storing an
    annotation.

    value
        The data value of the attribute.

    size
        The size of the value, in octets.  Set automatically by the
        server, read-only to clients.

    modifiedsince
        An opaque value set by the server when this entry is modified.
        It can be used by the client to request notification of which
        entries have changed since a particular point in time and is
        useful for disconnected/synchronisation operations.

    content-type
        A MIME [MIME] content type and subtype that describes the nature
        of the content of the "value" attribute.

    vendor.<vendor-token>
        Defines an attribute associated with a particular product of
        some vendor.  This attribute can be used by vendors to provide
        client specific attributes.  The vendor-token MUST be registered
        with IANA.

6 Private versus Shared and Access Control

    As discussed in the ANNOTATE extension [ANNOTATE] there is a need to
    support both private and shared annotations.  This document adopts


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    the scheme used in [ANNOTATE] that adds two standard suffixes for
    all attributes: ".shared" and ".priv".  A GETANNOTATION command
    which specifies neither uses both.  SETANNOTATION commands MUST
    explicitly use .priv or .shared suffixes.

    A user can only store and retrieve private annotations on a mailbox
    which is returned to them via a LIST or LSUB command.  A user can
    only store and retrieve shared annotations on a mailbox that they
    can SELECT and which opens READ-WRITE.  If a client attempts to
    store or retrieve a shared annotation on a READ-ONLY mailbox, the
    server MUST respond with a NO response.

7 IMAP Protocol Changes

7.1 GETANNOTATION Command

    This extension adds the GETANNOTATION command.  This allows clients
    to retrieve annotations.

    This command is only available in authenticated state [IMAP4].

        Arguments:  entry-specifier
                                attribute-specifier

        Responses:  required ANNOTATION response

        Result:     OK - command completed
                                NO - command failure: can't access annotations on that mailbox
                                BAD - command unknown or arguments invalid

    Example:

                C: a GETANNOTATION "/server/comment" "value.priv"
                S: * ANNOTATION "/server/comment" ("value.priv" "My comment")
                S: a OK GETANNOTATION complete

            In the above example, the contents of the "value" attribute
            for the "/server/comment" entry is requested by the client
            and returned by the server.

    "*" and "%" wildcard characters can be used in either specifier to
    match match one or more characters at that position, with the
    exception that "%" does not match the hierarchy delimiter for the
    specifier it appears in (i.e. "/" for an entry specifier or "." for
    an attribute specifer).  Thus an entry specifier of "/server/%"
    would match entries such as "/server/comment" and "/server/version",
    but not "/server/comment/note".

    Examples:

                C: a GETANNOTATION "/server/*" "value.priv"
                S: * ANNOTATION ("/server/comment" ("value.priv" "My comment"))


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                                                 ("/server/version" ("value.priv" "1.1"))
                                                 ("/server/motd/today" ("value.priv" "Closed at 1 pm"))
                S: a OK GETANNOTATION complete

            In the above example, the contents of the "value" attributes
            for any entries in the "/server" hierarchy are requested by
            the client and returned by the server.

                C: a GETANNOTATION "/server/%" "value"
                S: * ANNOTATION ("/server/comment" ("value.priv" "My comment")
                                                                                   ("value.shared" "Your comment"))
                                                 ("/server/motd" ("value.priv" "Its sunny outside!")
                                                                                 ("value.shared" "Today is a Holiday"))
                S: a OK GETANNOTATION complete

            In the above example, the contents of the "value" attributes
            for entries at the top level of the "/server" hierarchy
            only, are requested by the client and returned by the
            server.  Both the .priv and .shared values are returned, as
            neither were explicitly requested.

    Entry and attribute specifiers can be lists of atomic specifiers, so
    that multiple items of each type may be returned in a single
    GETANNOTATION command.

    Examples:

                C: a GETANNOTATION ("/server/comment" "/server/motd") "value.priv"
                S: * ANNOTATION ("/server/comment" ("value.priv" "My comment"))
                                                 ("/server/motd" ("value.priv" "Its sunny outside!"))
                S: a OK GETANNOTATION complete

            In the above example, the contents of the "value" attributes
            for the two entries "/server/comment" and "/server/motd" are
            requested by the client and returned by the server.

                C: a GETANNOTATION "/server/comment" ("value.priv" "modifiedsince.priv")
                S: * ANNOTATION "/server/comment"
                                                ("value.priv" "My comment"
                                                        "modifiedsince.priv" "19990203205432")
                S: a OK GETANNOTATION complete

            In the above example, the contents of the "value" and
            "modifiedsince" attributes for the "/server/comment" entry
            are requested by the client and returned by the server.

7.2 SETANNOTATION command

    This extension adds the SETANNOTATION command.  This allows clients
    to set annotations.




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    This command is only available in authenticated state [IMAP4].

        Arguments:  entry
                                attribute-value
                                list of entry, attribute-values

        Responses:  no specific responses for this command

        Result:     OK - command completed
                                NO - command failure: can't set annotations
                                BAD - command unknown or arguments invalid

    Sets the specified list of entries by adding or replacing the
    specified attributes with the values provided.  Clients can use NIL
    for values of attributes it wants to remove from entries.  The
    server MAY return an unsolicited ANNOTATION response containing the
    updated annotation data.  Clients MUST NOT assume that an
    unsolicited ANNOTATION response will be sent, and MUST assume that
    if the command succeeds then the annotation has been changed.

    Examples:

                C: a SETANNOTATION "/mailbox/{INBOX}/comment"
                                                                ("value.priv" "My new comment")
                S: a OK SETANNOTATION complete

            In the above example, the entry "/mailbox/{INBOX}/comment"
            is created (if not already present) and the private
            attribute "value" with data set to "My new comment" is
            created if not already present, or replaced if it previously
            exists.

                C: a SETANNOTATION "/mailbox/{INBOX}/comment" ("value.priv" NIL)
                S: a OK SETANNOTATION complete

            In the above example, the private "value" attribute of the
            entry "/mailbox/{INBOX}/comment" is removed.

    Multiple entries can be set in a single SETANNOTATION command by
    listing entry-attribute-value pairs in the list.

    Example:
                C: a SETANNOTATION "/mailbox/{INBOX}/comment"
                                                          ("value.priv" "My new comment")
                                                        "/mailbox/{INBOX.shared}/comment"
                                                          ("value.shared" "This is a shared mailbox")
                S: a OK SETANNOTATION complete

            In the above example, the entries "/mailbox/{INBOX}/comment"
            and "/mailbox/{INBOX.shared}/comment" are created (if not
            already present) and the private and shared attributes
            "value" are created respectively for each entry if not


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            already present, or replaced if they previously existed.

    Multiple attributes can be set in a single SETANNOTATION command by
    listing multiple attribute-value pairs in the entry list.

    Example:
                C: a SETANNOTATION "/mailbox/{INBOX}/comment"
                                                         ("value.priv" "My new comment"
                                                          "vendor.foobar.bloop.priv" "foo's bar")
                S: a OK SETANNOTATION complete

            In the above example, the entry "/mailbox/{INBOX}/comment"
            is created (if not already present) and the private
            attributes "value" and "vendor.foobar.bloop" are created if
            not already present, or replaced if they previously existed.

7.3 ANNOTATION Response

    The ANNOTATION response displays results of a GETANNOTATION command,
    or can be returned as a unsolicited response at anytime by the
    server in response to a change in an annotation.

    Servers SHOULD send unsolicited ANNOTATION responses if an
    annotation is changed by a third-party, allowing servers to keep
    clients updated with changes to annotations by other clients.  In
    this case, only the entries are returned in the ANNOTATION response,
    not the attributes and values.  If the client wants to update any
    cached values it must explicitly retrieve those using a
    GETANNOTATION command.

    This response is only available in authenticated state [IMAP4].

7.3.1 ANNOTATION response with attributes and values
        The response consists of a list of entries each of which has a
        list of attribute-value pairs.

    Examples:

                C: a GETANNOTATION "/server/comment" "value.priv"
                S: * ANNOTATION "/server/comment" ("value.priv" "My comment")
                S: a OK GETANNOTATION complete

            In the above example, a single entry with a single
            attribute-value pair is returned by the server.

                C: a GETANNOTATION ("/server/comment" "/server/motd") "value.priv"
                S: * ANNOTATION ("/server/comment" ("value.priv" "My comment"))
                                                 ("/server/motd" ("value.priv" "Its sunny outside!"))
                S: a OK GETANNOTATION complete

            In the above example, two entries each with a single
            attribute-value pair is returned by the server.


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                C: a GETANNOTATION "/server/comment" ("value.priv" "modifiedsince.priv")
                S: * ANNOTATION "/server/comment" (("value.priv" "My comment")
                                                        ("modifiedsince.priv" "19990203205432"))
                S: a OK GETANNOTATION complete

            In the above example, a single entry with two
            attribute-value pairs is returned by the server.

7.3.2 Unsolicted ANNOTATION response without attributes and values
        The response consists of a list of entries each which have
        changed on the server.

    Examples:

                C: a NOOP
                S: * ANNOTATION "/server/comment"
                S: a OK NOOP complete

            In the above example, the server indicates that the
            "/server/comment" entry has been changed.

                C: a NOOP
                S: * ANNOTATION ("/server/comment")("/server/motd")
                S: a OK NOOP complete

            In the above example, the server indicates a change to two
            entries.

8 Formal Syntax

    The following syntax specification uses the Augmented Backus-Naur
    Form (ABNF) notation as specified in [ABNF].

    Non-terminals referenced but not defined below are as defined by
    [IMAP4].

    Except as noted otherwise, all alphabetic characters are case-
    insensitive.  The use of upper or lower case characters to define
    token strings is for editorial clarity only.  Implementations MUST
    accept these strings in a case-insensitive fashion.

        command-auth    /= setannotation / getannotation
                                          ; adds to original IMAP4 command

        response-data   /= "*" SP annotate-data CRLF
                                          ; adds to original IMAP4 data responses

        getannotation   = "GETANNOTATION" SP entries SP attribs
                                          ; new command

        setannotation   = "SETANNOTATION" SP setentries
                                          ; new command


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        annotate-data   = "ANNOTATION" SP entry-list
                                          ; new response

        entries         = entry-match / "(" entry-match *(SP entry-match) ")"
                                          ; entry specifiers that can include wildcards

        attribs         = attrib-match / "(" attrib-match *(SP attrib-match) ")"
                                          ; attribute specifiers that can include wildcards

        entry-list      = entry-att / "(" entry-att *(SP entry-att) ")"
                                          ; entry, attribute-value pairs list

        setentries      = entry-att *(SP entry-att)
                                          ; multiple entry, attribute-value pairs list

        entry-att       = entry SP "(" att-value *(SP att-value) ")"
        att-value       = attrib SP value

        atom-slash       = any ATOM-CHAR except "/"
        atom-dot         = any ATOM-CHAR except "."

        entry            = DQUOTE 1*atom-slash *("/" 1*atom-slash) DQUOTE
        entry-match      = DQUOTE 1*entry-match-atom
                                                           *("/" 1*entry-match-atom) DQUOTE
        entry-match-atom = 1*(list-wildcards / atom-slash)

        attrib            = DQUOTE 1*atom-dot *("." 1*atom-dot) DQUOTE
        attrib-match      = DQUOTE 1*attrib-match-atom
                                                                *("." 1*attrib-match-atom) DQUOTE
        attrib-match-atom = 1*(list-wildcards / atom-dot)

        value             = nstring





















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9 IANA Considerations

    Both entry names and attribute names MUST be specified in a
    standards track or IESG approved experimental RFC, or fall under the
    vendor namespace.  Vendor names MUST be registered.

9.1 Entry and Attribute Registration Template

        To: iana@iana.org
        Subject: IMAP Annotate More Registration

        Please register the following IMAP Annotate More item:

        [] Entry        [] Attribute
        [] Vendor       [] Open: RFC _______

        Name: ______________________________

        Description: _______________________

        ____________________________________

        ____________________________________

        Contact person: ____________________

                        email:  ____________________


10 Security Considerations

    There are no known security issues with this extension.


11 References

    [ABNF] Crocker, Overell, "Augmented BNF for Syntax Specifications:
    ABNF", RFC 2234, Internet Mail Consortium, Demon Internet Ltd,
    November 1997.

    [ACAP] Newman, C., and Myers, J. "ACAP -- Application Configuration
    Access Protocol", RFC 2244, November 1997.

    [ANNOTATE] Daboo, C., Gellens, R., "IMAP ANNOTATE Extension",
    draft-ietf-imapext-annotate-03.txt, January 2002.

    [IMAP4] Crispin, M., "Internet Message Access Protocol - Version
    4rev1", RFC 2060, University of Washington, December 1996.

    [IMAPURL] Newman, C., "IMAP URL Scheme", RFC 2192, Innosoft,
    September 1997.



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    [KEYWORDS] Bradner, "Key words for use in RFCs to Indicate
    Requirement Levels", RFC 2119, Harvard University, March 1997.

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

    [SORT] Crispin, M., Murchison, K., "Internet Message Access Protocol
    - Sort Extension", draft-ietf-imapext-sort-07.txt, University of
    Washington, Oceana Matrix Ltd., September 2001.

    [THREAD] Crispin, M., Murchison, K., "Internet Message Access
    Protocol - Thread Extension", draft-ietf-imapext-thread-07.txt,
    University of Washington, Oceana Matrix Ltd., September 2001.


12 Acknowledgments

    The ideas expressed in this document are based on the message
    annotation document that was co-authored by Randall Gellens.


13 Author's Address

        Cyrus Daboo
        Cyrusoft International, Inc.
        Suite 780, 5001 Baum Blvd.
        Pittsburgh, PA 15213
        U.S.A.

        Email: daboo@cyrusoft.com
























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