JMAP                                                      J.M. Baum, Ed.
Internet-Draft                                          H.J. Happel, Ed.
Intended status: Standards Track                                 audriga
Expires: 23 October 2021                                   21 April 2021


                             JMAP for Tasks
                        draft-ietf-jmap-tasks-00

Abstract

   This document specifies a data model for synchronizing task data with
   a server using JMAP.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on 23 October 2021.

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   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3



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     1.1.  Notational Conventions  . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  Data Model Overview . . . . . . . . . . . . . . . . . . .   4
     1.4.  Addition to the Capabilities Object . . . . . . . . . . .   4
       1.4.1.  urn:ietf:params:jmap:tasks  . . . . . . . . . . . . .   4
   2.  Principals  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Principal Capability urn:ietf:params:jmap:tasks . . . . .   5
   3.  Assignee Identities . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  AssigneeIdentity/get  . . . . . . . . . . . . . . . . . .   6
     3.2.  AssigneeIdentity/changes  . . . . . . . . . . . . . . . .   6
     3.3.  AssigneeIdentity/set  . . . . . . . . . . . . . . . . . .   6
   4.  TaskLists . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  TaskList/get  . . . . . . . . . . . . . . . . . . . . . .   8
     4.2.  TaskList/changes  . . . . . . . . . . . . . . . . . . . .   9
     4.3.  TaskList/set  . . . . . . . . . . . . . . . . . . . . . .   9
   5.  Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  Additional JSCalendar properties  . . . . . . . . . . . .  10
       5.1.1.  mayInviteSelf . . . . . . . . . . . . . . . . . . . .  10
       5.1.2.  mayInviteOthers . . . . . . . . . . . . . . . . . . .  10
       5.1.3.  hideAttendees . . . . . . . . . . . . . . . . . . . .  11
       5.1.4.  relatedTo . . . . . . . . . . . . . . . . . . . . . .  11
     5.2.  Properties similar in JMAP for Calendar . . . . . . . . .  11
     5.3.  Task/get  . . . . . . . . . . . . . . . . . . . . . . . .  11
     5.4.  Task/changes  . . . . . . . . . . . . . . . . . . . . . .  11
     5.5.  Task/set  . . . . . . . . . . . . . . . . . . . . . . . .  11
     5.6.  Task/copy . . . . . . . . . . . . . . . . . . . . . . . .  12
     5.7.  Task/query  . . . . . . . . . . . . . . . . . . . . . . .  12
     5.8.  Task/queryChanges . . . . . . . . . . . . . . . . . . . .  12
   6.  Task Notifications  . . . . . . . . . . . . . . . . . . . . .  12
     6.1.  Object Properties . . . . . . . . . . . . . . . . . . . .  12
     6.2.  TaskNotification/get  . . . . . . . . . . . . . . . . . .  13
     6.3.  TaskNotification/changes  . . . . . . . . . . . . . . . .  13
     6.4.  TaskNotification/set  . . . . . . . . . . . . . . . . . .  13
     6.5.  TaskNotification/query  . . . . . . . . . . . . . . . . .  14
       6.5.1.  Filtering . . . . . . . . . . . . . . . . . . . . . .  14
       6.5.2.  Sorting . . . . . . . . . . . . . . . . . . . . . . .  14
     6.6.  TaskNotification/queryChanges . . . . . . . . . . . . . .  14
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
     8.1.  JMAP Capability Registration for "tasks"  . . . . . . . .  14
     8.2.  JSCalendar Property Registrations . . . . . . . . . . . .  15
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .  15
   10. Informative References  . . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16







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1.  Introduction

   JMAP ([RFC8620] - JSON Meta Application Protocol) is a generic
   protocol for synchronizing data, such as mail, calendars or contacts,
   between a client and a server.  It is optimized for mobile and web
   environments, and aims to provide a consistent interface to different
   data types.

   JMAP for Calendars ([I-D.ietf-jmap-calendars]) defines a data model
   for synchronizing calendar data between a client and a server using
   JMAP.  The data model is designed to allow a server to provide
   consistent access to the same data via CalDAV [RFC4791] as well as
   JMAP.

   While CalDAV defines access to tasks, JMAP for Calendars does not.
   This specification fills this gap and defines a data model for
   synchronizing task data between a client and a server using JMAP.  It
   is built upon JMAP for Calendars and reuses most of its definitions.
   For better readability this document only outlines differences
   between this specification and JMAP for Calendars.  If not stated
   otherwise, the same specifics that apply to Calendar, CalendarEvent
   and CalendarEventNotification objects as defined in the aforemetioned
   specification also apply to similar data types introduced in this
   specification.

1.1.  Notational Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

   Type signatures, examples, and property descriptions in this document
   follow the conventions established in Section 1.1 of [RFC8620].  Data
   types defined in the core specification are also used in this
   document.

1.2.  Terminology

   The same terminology is used in this document as in the core JMAP
   specification, see [RFC8620], Section 1.6.

   The terms ParticipantIdentity, TaskList, Task and TaskNotification
   are used to refer to the data types defined in this document and
   instances of those data types.





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1.3.  Data Model Overview

   Similar to JMAP for Calendar, an Account (see [RFC8620],
   Section 1.6.2) contains zero or more TaskList objects, which is a
   named collection of Tasks belonging to a Principal (see
   [I-D.jenkins-jmap-sharing] Section XXX).  Task lists can also provide
   defaults, such as alerts and a color to apply to tasks in the
   calendar.  Clients commonly let users toggle visibility of tasks
   belonging to a particular task list on/off.  Servers may allow a task
   to belong to multiple TaskLists within an account.

   A Task is a representation of a single task or recurring series of
   Tasks in JSTask [I-D.ietf-calext-jscalendar] format.  Recurrence
   rules and alerts as defined in JMAP for Calendars (see
   [I-D.ietf-jmap-calendars] Section XXX) apply.

   Just like the CalendarEventNotification objects (see
   [I-D.ietf-jmap-calendars] Section XXX), TaskNotification objects keep
   track of the history of changes made to a task by other users.
   Similarly, the ShareNotification type (see [I-D.jenkins-jmap-sharing]
   Section XXX) notifies the user when their access to another user's
   calendar is granted or revoked.

1.4.  Addition to the Capabilities Object

   The capabilities object is returned as part of the JMAP Session
   object; see [RFC8620], Section 2.  This document defines one
   additional capability URI.

1.4.1.  urn:ietf:params:jmap:tasks

   This represents support for the TaskList, Task and TaskNotification
   data types and associated API methods.  The value of this property in
   the JMAP Session capabilities property is an empty object.

   The value of this property in an account's accountCapabilities
   property is an object that MUST contain the following information on
   server capabilities and permissions for that account:

   *  *shareesActAs*: "String" This MUST be one of:

      -  "self" - sharees act as themselves when using tasks in this
         account.

      -  "secretary"- sharees act as the principal to which this account
         belongs.





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   *  *minDateTime*: "LocalDate" The earliest date-time the server is
      willing to accept for any date stored in a Task.

   *  *maxDateTime*: "LocalDate" The latest date-time the server is
      willing to accept for any date stored in a Task.

   *  *maxExpandedQueryDuration*: "Duration" The maximum duration the
      user may query over when asking the server to expand recurrences.

   *  *maxAssigneesPerTask*: "Number|null" The maximum number of
      assignees a single task may have, or null for no limit.

   *  *mayCreateTaskList*: "Boolean" If true, the user may create a task
      list in this account.

2.  Principals

   For systems that also support JMAP Sharing [RFC XXX], the tasks
   capability is used to indicate that this principal may be used with
   tasks.

2.1.  Principal Capability urn:ietf:params:jmap:tasks

   A "urn:ietf:params:jmap:tasks" property is added to the Principal
   "capabilities" object, the value of which is an object with the
   following properties:

   *  *accountId*: "Id|null" Id of Account with the
      "urn:ietf:params:jmap:tasks" capability that contains the task
      data for this principal, or null if none (e.g. the Principal is a
      group just used for permissions management), or the user does not
      have access to any data in the account.

   *  *account*: "Account|null" The JMAP Account object corresponding to
      the accountId, null if none.

   *  *sendTo*: "String[String]|null" If this principal may be added as
      a participant to an event, this is the map of methods for adding
      it, in the same format as Participant#sendTo in JSTask (see
      [I-D.ietf-calext-jscalendar], Section 4.4.5).

3.  Assignee Identities

   An AssigneeIdentity stores information about a URI that represents
   the user within that account in an event's assignees.  It has the
   following properties:

   *  *id*: "Id" (immutable; server-set) The id of the AssigneeIdentity.



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   *  *name*: "String" (default: "") The display name of the assignee to
      use when adding this assignee to a task, e.g.  "Jane Bloggs".

   *  *sendTo*: "String[String]" Represents methods by which the
      participant may receive invitations and updates to an event.

      The keys in the property value are the available methods and MUST
      only contain ASCII alphanumeric characters (A-Za-z0-9).  The value
      is a URI for the method specified in the key.

   An assignee in an task corresponds to an AssigneeIdentity if any of
   the method/uri pairs in the sendTo property of the participant are
   identical to a method/uri pair in the sendTo property of the
   identity.

   The following JMAP methods are supported.

3.1.  AssigneeIdentity/get

   This is a standard "/get" method as described in [RFC8620],
   Section 5.1.  The _ids_ argument may be "null" to fetch all at once.

3.2.  AssigneeIdentity/changes

   This is a standard "/changes" method as described in [RFC8620],
   Section 5.2.

3.3.  AssigneeIdentity/set

   This is a standard "/set" method as described in [RFC8620],
   Section 5.3.  The server MAY restrict the uri values the user may
   claim, for example only allowing "mailto:" URIs with email addresses
   that belong to the user.  A standard "forbidden" error is returned to
   reject non-permissible changes.

4.  TaskLists

   A TaskList is a named collection of tasks.  All tasks are associated
   with exactly one TaskList.

   A *TaskList* object has the following properties:

   *  *id*: "Id" (immutable; server-set) The id of the task list.

   *  *role*: "String|null" (default: null) Denotes the task list has a
      special purpose.  This MUST be one of the following:

      -  "inbox": This is the principal's default task list;



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      -  "trash": This task list holds messages the user has discarded;

   *  *name*: "String" The user-visible name of the task list.  This may
      be any UTF-8 string of at least 1 character in length and maximum
      255 octets in size.

   *  *description*: "String|null" (default: null) An optional longer-
      form description of the task list, to provide context in shared
      environments where users need more than just the name.

   *  *color*: "String|null" (default: null) A color to be used when
      displaying events associated with the task list.

      If not null, the value MUST be a case-insensitive color name taken
      from the set of names defined in Section 4.3 of CSS Color Module
      Level 3 COLORS (https://www.w3.org/TR/css-color-3/), or an RGB
      value in hexadecimal notation, as defined in Section 4.2.1 of CSS
      Color Module Level 3.

      The color SHOULD have sufficient contrast to be used as text on a
      white background.

   *  *sortOrder*: "UnsignedInt" (default: 0) Defines the sort order of
      task lists when presented in the client's UI, so it is consistent
      between devices.  The number MUST be an integer in the range 0 <=
      sortOrder < 2^(31.)

      A task list with a lower order should be displayed before a list
      with a higher order in any list of task lists in the client's UI.
      Task lists with equal order SHOULD be sorted in alphabetical order
      by name.  The sorting should take into account locale-specific
      character order convention.

   *  *isSubscribed*: "Boolean" Has the user indicated they wish to see
      this task list in their client?  This SHOULD default to false for
      task lists in shared accounts the user has access to and true for
      any new task list created by the user themself.

      If false, the task list should only be displayed when the user
      explicitly requests it or to offer it for the user to subscribe
      to.

   *  *defaultAlertsWithTime*: "Id[Alert]|null" (default: null) A map of
      alert ids to Alert objects (see [I-D.ietf-calext-jscalendar],
      Section 4.5.2) to apply for events where "showWithoutTime" is
      false and "useDefaultAlerts" is true.  Ids MUST be unique across
      all default alerts in the account, including those in other task
      lists; a UUID is recommended.



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   *  *defaultAlertsWithoutTime*: "Id[Alert]|null" (default: null) A map
      of alert ids to Alert objects (see [I-D.ietf-calext-jscalendar],
      Section 4.5.2) to apply for events where "showWithoutTime" is true
      and "useDefaultAlerts" is true.  Ids MUST be unique across all
      default alerts in the account, including those in other task
      lists; a UUID is recommended.

   *  *timeZone*: "String|null" (default: null) The time zone to use for
      events without a time zone when the server needs to resolve them
      into absolute time, e.g., for alerts or availability calculation.
      The value MUST be a time zone id from the IANA Time Zone Database
      TZDB (https://www.iana.org/time-zones).  If "null", the timeZone
      of the account's associated Principal will be used.  Clients
      SHOULD use this as the default for new events in this task list if
      set.

   *  *shareWith*: "Id[CalendarRights]|null" (default: null) A map of
      Principal id to rights for principals this calendar is shared
      with.  The principal to which this task list belongs MUST NOT be
      in this set.  This is null if the user requesting the object does
      not have the mayAdmin right, or if the task list is not shared
      with anyone.  May be modified only if the user has the mayAdmin
      right.  The account id for the principals may be found in the
      "urn:ietf:params:jmap:principals:owner" capability of the Account
      to which the calendar belongs.

   The user is an *owner* for a task if the Task object has an
   "assignee" property, and one of the Participant objects both:

   1.  Has the "chair" role.

   2.  Corresponds to one of the user's AssigneeIdentity objects in the
       account.

   A task has no owner if its assignee property is null or omitted.

   TODO currently disregarding "myRights"

4.1.  TaskList/get

   This is a standard "/get" method as described in [RFC8620],
   Section 5.1.  The _ids_ argument may be "null" to fetch all at once.

   TODO add part about rights properties.







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4.2.  TaskList/changes

   This is a standard "/changes" method as described in [RFC8620],
   Section 5.2.

4.3.  TaskList/set

   This is the "Calendar/set" method as described in
   [I-D.ietf-jmap-calendars], Section XXX.

   TODO copy+paste from "Calendar/set" and replace
   "onDestroyRemoveEvents" by "onDestroyRemoveTasks" (and
   "calendarHasEvent").

5.  Tasks

   A *Task* object contains information about a task, or recurring
   series of tasks.  It is a JSTask object, as defined in
   [I-D.ietf-calext-jscalendar], with the following additional
   properties:

   *  *id*: "Id" The id of the Task.  This property is immutable.  The
      id uniquely identifies a JSTask with a particular "uid" and
      "recurrenceId" within a particular account.

   *  *taskListId*: "Id" The TaskList id this task belongs to.  A task
      MUST belong to exactly one TaskList at all times (until it is
      destroyed).

   *  *isDraft*: "Boolean" If true, this task is to be considered a
      draft.  The server will not send any push notifications for
      alerts.  This may only be set to true upon creation.  Once set to
      false, the value cannot be updated to true.  This property MUST
      NOT appear in "recurrenceOverrides".

   *  *utcStart*: "UTCDate" For simple clients that do not or cannot
      implement time zone support.  Clients should only use this if also
      asking the server to expand recurrences, as you cannot accurately
      expand a recurrence without the original time zone.

      This property is calculated at fetch time by the server.  Time
      zones are political, and they can and do change at any time.
      Fetching exactly the same property again may return different
      results if the time zone data has been updated on the server.
      Time zone data changes are not considered "updates" to the task.

      If set, the server will convert to the task's current time zone
      using its current time zone data and store the local time.



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      This is not included by default and must be requested explicitly.

      Floating tasks (tasks without a time zone) will be interpreted as
      per the time zone given as a Task/get argument.

      Note that it is not possible to accurately calculate the expansion
      of recurrence rules or recurrence overrides with the utcStart
      property rather than the local start time.  Even simple
      recurrences such as "repeat weekly" may cross a daylight-savings
      boundary and end up at a different UTC time.  Clients that wish to
      use "utcStart" are RECOMMENDED to request the server expand
      recurrences (see Section XXX).

   *  *utcDue*: "UTCDate" The server calculates the end time in UTC from
      the start/timeZone/duration properties of the task.  This is not
      included by default and must be requested explicitly.  Like
      utcStart, this is calculated at fetch time if requested and may
      change due to time zone data changes.  Floating tasks will be
      interpreted as per the time zone given as a Task/get argument.

   *  *sortOrder*: "UnsignedInt" (default: 0) Defines the sort order of
      a task when presented in the client's UI, so it is consistent
      between devices.  The number MUST be an integer in the range 0 <=
      sortOrder < 2^(31.)

      A task with a lower order should be displayed before a task with a
      higher order in any list of tasks in the client's UI.  Tasks with
      equal order SHOULD be sorted in alphabetical order by name.  The
      sorting should take into account locale-specific character order
      convention.

5.1.  Additional JSCalendar properties

   This document defines four new JSCalendar properties.

5.1.1.  mayInviteSelf

   Type: "Boolean" (default: false)

   If "true", any user that has access to the event may add themselves
   to it as a participant with the "attendee" role.  This property MUST
   NOT be altered in the recurrenceOverrides; it may only be set on the
   master object.

5.1.2.  mayInviteOthers

   Type: "Boolean" (default: false)




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   If "true", any current participant with the "attendee" role may add
   new participants with the "attendee" role to the event.  This
   property MUST NOT be altered in the recurrenceOverrides; it may only
   be set on the master object.

5.1.3.  hideAttendees

   Type: "Boolean" (default: false)

   If "true", only the owners of the event may see the full set of
   participants.  Other sharees of the event may only see the owners and
   themselves.  This property MUST NOT be altered in the
   recurrenceOverrides; it may only be set on the master object.

5.1.4.  relatedTo

   Type: "Id[String]|null" (default: null)

   A map of task ids to relations.  Relation SHOULD be one of: -
   "blockedBy": Blocked by task with id.  - "clonedBy": Task with id was
   cloned from this issue.  - "duplicatedBy": Task with id is a
   duplicate of this issue.  - "causedBy": Task with id was the cause
   for this task.  - "relatesTo": Task with id is related.  - "childOf":
   Task with id is parent.

5.2.  Properties similar in JMAP for Calendar

   Attachments, per-user properties, recurrences and updates to
   recurrences are described in [I-D.ietf-jmap-calendars], Section XXX.

5.3.  Task/get

   This is the "CalendarEvent/get" method as described in
   [I-D.ietf-jmap-calendars], Section XXX.

   TODO redefine this here.  Similar to "TaskList/get" we only need to
   replace a few definitions.  For example, replace "reduceParticipants"
   with "reduceAssignees".  Copy+Paste most of the stuff.

5.4.  Task/changes

   This is a standard "/changes" method as described in [RFC8620],
   Section 5.2.

5.5.  Task/set

   This is the "CalendarEvent/set" method as described in
   [I-D.ietf-jmap-calendars], Section XXX.



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   TODO copy+paste most stuff from "CalendarEvent/set".  It should be
   fine to just reference patching.

5.6.  Task/copy

   This is a standard "/copy" method as described in [RFC8620],
   Section 5.4.

5.7.  Task/query

   This is the "CalendarEvent/query" method as described in
   [I-D.ietf-jmap-calendars], Section XXX.

   TODO copy+paste most stuff from "CalendarEvent/query".  Mainly
   filtering should be different.

5.8.  Task/queryChanges

   This is a standard "/queryChanges" method as described in [RFC8620],
   Section 5.6.

6.  Task Notifications

   The TaskNotification data type records changes made by external
   entities to tasks in calendars the user is subscribed to.
   Notifications are stored in the same Account as the Task that was
   changed.

   This is the same specification as the CalendarEventNotification
   object from [I-D.ietf-jmap-calendars], Section XXX.  Only the object
   properties differ slightly and are therefore fully described in this
   document.

6.1.  Object Properties

   The *TaskNotification* object has the following properties:

   *  *id*: "String" The id of the TaskNotification.

   *  *created*: "UTCDate" The time this notification was created.

   *  *changedBy*: "Person" Who made the change.

      -  *name*: "String" The name of the person who made the change.

      -  *email*: "String" The email of the person who made the change,
         or null if no email is available.




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      -  *principalId*: "String|null" The id of the principal
         corresponding to the person who made the change, if any.  This
         will be null if the change was due to receving an iTIP message.

   *  *comment*: "String|null" Comment sent along with the change by the
      user that made it. (e.g.  COMMENT property in an iTIP message).

   *  *type*: "String" This MUST be one of

      -  created

      -  updated

      -  destroyed

   *  *TaskId*: "String" The id of the Task that this notification is
      about.

   *  *isDraft*: "Boolean" (created/updated only) Is this event a draft?

   *  *event*: "JSTask" The data before the change (if updated or
      destroyed), or the data after creation (if created).

   *  *eventPatch*: "PatchObject" (updated only) A patch encoding the
      change between the data in the event property, and the data after
      the update.

   To reduce data, if the change only affects a single instance of a
   recurring event, the server MAY set the event and eventPatch
   properties for the instance; the calendarEventId MUST still be for
   the master event.

6.2.  TaskNotification/get

   This is a standard "/get" method as described in [RFC8620],
   Section 5.1.

6.3.  TaskNotification/changes

   This is a standard "/changes" method as described in [RFC8620],
   Section 5.2.

6.4.  TaskNotification/set

   This is a standard "/changes" method as described in [RFC8620],
   Section 5.3.





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   Only destroy is supported; any attempt to create/update MUST be
   rejected with a "forbidden" SetError.

6.5.  TaskNotification/query

   This is a standard "/query" method as described in [RFC8620],
   Section 5.5.

6.5.1.  Filtering

   A *FilterCondition* object has the following properties:

   *  *after*: "UTCDate|null" The creation date must be on or after this
      date to match the condition.

   *  *before*: "UTCDate|null" The creation date must be before this
      date to match the condition.

   *  *type*: "String" The type property must be the same to match the
      condition.

   *  *taskIds*: "Id[]|null" A list of task ids.  The taskId property of
      the notification must be in this list to match the condition.

6.5.2.  Sorting

   The "created" property MUST be supported for sorting.

6.6.  TaskNotification/queryChanges

   This is a standard "/queryChanges" method as described in [RFC8620],
   Section 5.6.

7.  Security Considerations

   All security considerations of JMAP for Calendars
   [I-D.ietf-jmap-calendars] apply to this specification.

8.  IANA Considerations

8.1.  JMAP Capability Registration for "tasks"

   TODO Actually register

   IANA will register the "tasks" JMAP Capability as follows:

   Capability Name: "urn:ietf:params:jmap:tasks"




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   Specification document: this document

   Intended use: common

   Change Controller: IETF

   Security and privacy considerations: this document, Section XXX

8.2.  JSCalendar Property Registrations

   All IANA registrations for JSTask are described in JMAP for Calendars
   [I-D.ietf-jmap-calendars].

9.  Normative References

   [I-D.ietf-calext-jscalendar]
              Jenkins, N. and R. Stepanek, "JSCalendar: A JSON
              representation of calendar data", Work in Progress,
              Internet-Draft, draft-ietf-calext-jscalendar-32, 15
              October 2020, <https://tools.ietf.org/html/draft-ietf-
              calext-jscalendar-32>.

   [I-D.ietf-jmap-calendars]
              Jenkins, N. and M. Douglass, "JMAP for Calendars", Work in
              Progress, Internet-Draft, draft-ietf-jmap-calendars-05, 24
              January 2021, <https://tools.ietf.org/html/draft-ietf-
              jmap-calendars-05>.

   [I-D.jenkins-jmap-sharing]
              Jenkins, N., "JMAP Sharing", Work in Progress, Internet-
              Draft, draft-jenkins-jmap-sharing-00, 15 December 2020,
              <https://tools.ietf.org/html/draft-jenkins-jmap-sharing-
              00>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8620]  Jenkins, N. and C. Newman, "The JSON Meta Application
              Protocol (JMAP)", RFC 8620, DOI 10.17487/RFC8620, July
              2019, <https://www.rfc-editor.org/info/rfc8620>.

10.  Informative References



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   [RFC4791]  Daboo, C., Desruisseaux, B., and L. Dusseault,
              "Calendaring Extensions to WebDAV (CalDAV)", RFC 4791,
              DOI 10.17487/RFC4791, March 2007,
              <https://www.rfc-editor.org/info/rfc4791>.

Authors' Addresses

   Joris Baum (editor)
   audriga
   Durlacher Allee 47
   76131 Karlsruhe
   Germany

   Email: joris@audriga.com
   URI:   https://www.audriga.com


   Hans-Joerg (editor)
   audriga
   Durlacher Allee 47
   76131 Karlsruhe
   Germany

   Email: hans-joerg@audriga.com
   URI:   https://www.audriga.com


























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