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IETF RFC 4324
Calendar Access Protocol (CAP)
Last modified on Monday, December 19th, 2005
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Network Working Group D. Royer
Request for Comments: 4324 IntelliCal, LLC
Category: Experimental G. Babics
Oracle
S. Mansour
eBay
December 2005
Calendar Access Protocol (CAP)
 Status of This Memo
This memo defines an Experimental Protocol for the Internet
community. It does not specify an Internet standard of any kind.
Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.
Copyright Notice
Copyright © The Internet Society (2005).
Abstract
The Calendar Access Protocol (CAP) described in this memo permits a
Calendar User (CU) to utilize a Calendar User Agent (CUA) to access
an iCAL-based Calendar Store (CS). At the time of this writing,
three vendors are implementing CAP, but it has already been
determined that some changes are needed. In order to get
implementation experience, the participants felt that a CAP
specification is needed to preserve many years of work. Many
properties in CAP which have had many years of debate, can be used by
other iCalendar protocols.
Royer, et al. Experimental PAGE 1 
RFC 4324 Calendar Access Protocol December 2005
Table of Contents
1. Introduction ....................................................5
1.1. Formatting Conventions .....................................5
1.2. Related Documents ..........................................6
1.3. Definitions ................................................7
2. Additions to iCalendar .........................................11
2.1. New Value Types (Summary) ................................14
2.1.1. New Parameters (summary) .............................14
2.1.2. New or Updated Properties (summary) ..................14
2.1.3. New Components (summary) .............................17
2.2. Relationship of RFC 2446 (ITIP) to CAP ...................18
3. CAP Design .....................................................20
3.1. System Model ..............................................20
3.2. Calendar Store Object Model ...............................20
3.3. Protocol Model ............................................21
3.3.1. Use of BEEP, MIME, and iCalendar .....................22
4. Security Model .................................................23
4.1. Calendar User and UPNs ....................................23
4.1.1. UPNs and Certificates ................................24
4.1.2. Anonymous Users and Authentication ...................25
4.1.3. User Groups ..........................................25
4.2. Access Rights .............................................26
4.2.1. Access Control and NOCONFLICT ........................26
4.2.2. Predefined VCARs .....................................26
4.2.3. Decreed VCARs ........................................28
4.3. CAP Session Identity ......................................28
5. CAP URL and Calendar Address ...................................29
6. New Value Types ................................................30
6.1. Property Value Data Types .................................30
6.1.1. CAL-QUERY Value Type .................................30
6.1.1.1. [NOT] CAL-OWNERS() ..............................36
6.1.1.2. CURRENT-TARGET() ................................37
6.1.1.3. PARAM() .........................................37
6.1.1.4. SELF() ..........................................38
6.1.1.5. STATE() .........................................38
6.1.1.6. Use of Single Quote .............................38
6.1.1.7. Comparing DATE and DATE-TIME Values .............39
6.1.1.8. DTEND and DURATION ..............................40
6.1.1.9. [NOT] LIKE ......................................40
6.1.1.10. Empty vs. NULL .................................41
6.1.1.11. [NOT] IN .......................................41
6.1.1.12. DATE-TIME and TIME Values in a WHERE Clause ....42
6.1.1.13. Multiple Contained Components ..................43
6.1.1.14. Example, Query by UID ..........................43
6.1.1.15. Query by Date-Time Range .......................43
6.1.1.16. Query for All Unprocessed Entries ..............44
6.1.1.17. Query with Subset of Properties by Date/Time ...44
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RFC 4324 Calendar Access Protocol December 2005
6.1.1.18. Query with Components and Alarms in A Range ....45
6.1.2. UPN Value Type .......................................45
6.1.3. UPN-FILTER Value .....................................46
7. New Parameters .................................................48
7.1. ACTION Parameter ..........................................48
7.2. ENABLE Parameter ..........................................48
7.3. ID Parameter ..............................................49
7.4. LATENCY Parameter .........................................50
7.5. LOCAL Parameter ...........................................50
7.6. LOCALIZE Parameter ........................................51
7.7. OPTIONS Parameter .........................................52
8. New Properties .................................................52
8.1. ALLOW-CONFLICT Property ...................................52
8.2. ATT-COUNTER Property ......................................53
8.3. CALID Property ............................................54
8.4. CALMASTER Property ........................................54
8.5. CAP-VERSION Property ......................................55
8.6. CARID Property ............................................55
8.7. CAR-LEVEL Property ........................................56
8.8. COMPONENTS Property .......................................56
8.9. CSID Property .............................................58
8.10. DECREED Property .........................................58
8.11. DEFAULT-CHARSET Property .................................59
8.12. DEFAULT-LOCALE Property ..................................60
8.13. DEFAULT-TZID Property ....................................61
8.14. DEFAULT-VCARS Property ...................................62
8.15. DENY Property ............................................62
8.16. EXPAND property ..........................................63
8.17. GRANT Property ...........................................64
8.18. ITIP-VERSION Property ....................................64
8.19. MAX-COMP-SIZE Property ...................................65
8.20. MAXDATE Property .........................................65
8.21. MINDATE Property .........................................66
8.22. MULTIPART Property .......................................66
8.23. NAME Property ............................................67
8.24. OWNER Property ...........................................68
8.25. PERMISSION Property ......................................68
8.26. QUERY property ...........................................69
8.27. QUERYID property .........................................70
8.28. QUERY-LEVEL Property .....................................70
8.29. RECUR-ACCEPTED Property ..................................71
8.30. RECUR-LIMIT Property .....................................71
8.31. RECUR-EXPAND Property ....................................72
8.32. RESTRICTION Property .....................................72
8.33. SCOPE Property ...........................................73
8.34. STORES-EXPANDED Property .................................74
8.35. TARGET Property ..........................................74
8.36. TRANSP Property ..........................................75
Royer, et al. Experimental PAGE 3
RFC 4324 Calendar Access Protocol December 2005
9. New Components .................................................76
9.1. VAGENDA Component .........................................76
9.2. VCALSTORE Component .......................................78
9.3. VCAR Component ............................................80
9.4. VRIGHT Component ..........................................82
9.5. VREPLY Component ..........................................83
9.6. VQUERY Component ..........................................83
10. Commands and Responses ........................................85
10.1. CAP Commands (CMD) .......................................85
10.2. ABORT Command ............................................88
10.3. CONTINUE Command .........................................89
10.4. CREATE Command ...........................................90
10.5. DELETE Command ...........................................96
10.6. GENERATE-UID Command .....................................98
10.7. GET-CAPABILITY Command ..................................100
10.8. IDENTIFY Command ........................................103
10.9. MODIFY Command ..........................................105
10.10. MOVE Command ...........................................110
10.11. REPLY Response to a Command ............................112
10.12. SEARCH Command .........................................113
10.13. SET-LOCALE Command .....................................116
10.14. TIMEOUT Command ........................................118
10.15. Response Codes .........................................118
11. Object Registration ..........................................120
11.1. Registration of New and Modified Entities ...............120
11.2. Post the Item Definition ................................120
11.3. Allow a Comment Period ..................................120
11.4. Release a New RFC .......................................120
12. BEEP and CAP .................................................120
12.1. BEEP Profile Registration ...............................120
12.2. BEEP Exchange Styles ....................................123
12.3. BEEP Connection Details .................................123
13. IANA Considerations ..........................................125
14. Security Considerations ......................................125
Appendix A. Acknowledgements ....................................127
Appendix B. References ..........................................127
Appendix B.1. Normative References ..........................127
Appendix B.2. Informative References ........................128
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RFC 4324 Calendar Access Protocol December 2005
1. Introduction
This document specifies the Calendar Access Protocol (CAP). CAP
permits a Calendar User (CU) to utilize a Calendar User Agent (CUA)
to access an iCAL-based Calendar Store (CS) and manage calendar
information. In particular, the document specifies how to query,
create, modify, and delete iCalendar components (e.g., events, to-
dos, or daily journal entries). It further specifies how to search
for available busy time information. Synchronization with CUAs is
not covered, but it is believed to be possible using CAP.
At the time of this writing, three vendors are implementing CAP. It
has already been determined that some changes are needed. In order
to get implementation experience, the participants felt that a CAP
specification is needed to preserve many years of work. Many
properties in CAP can be used by other iCalendar protocols and have
had many years of debate.
CAP is specified as a BEEP (Block Extensible Exchange Protocol)
"profile" [BEEP] [BEEPGUIDE]. Many aspects of the protocol (e.g.,
authentication and privacy) are provided within BEEP. The protocol
data units of CAP leverage the standard iCalendar format iCAL [iCAL]
to convey calendar-related information.
CAP can also be used to store and fetch iCalendar Transport-
Independent Interoperability Protocol (iTIP) objects [iTIP]. iTIP
objects used are exactly as defined in [iTIP]. When iCalendar
objects are transferred between the CUA and a CS, some additional
properties and parameters may be added; the CUA is responsible for
correctly generating iCalendar objects to non-CAP processes.
The definition of new components, properties, parameters, and value
types are broken into two parts. The first part summarizes and
defines the new objects. The second part provides detail and ABNF
for those objects. The ABNF rules for CAP, as for other iCalendar
specifications, are order-independent. That is, properties in a
component may occur in any order, and parameters in any property may
occur in any order.
1.1. Formatting Conventions
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 [RFC 2119].
Calendaring and scheduling roles are referred to in quoted-strings of
text with the first character of each word in upper case. For
example, "Organizer" refers to a role of a "Calendar User" (CU)
Royer, et al. Experimental PAGE 5
RFC 4324 Calendar Access Protocol December 2005
within the protocol defined by [iTIP]. Calendar components defined
by [iCAL] are referred to with capitalized, quoted-strings of text.
All iCalendar components should start with the letter "V". For
example, "VEVENT" refers to the event calendar component, "VTODO"
refers to the to-do component, and "VJOURNAL" refers to the daily
journal component.
Scheduling methods defined by [iTIP] are referred to with
capitalized, quoted-strings of text. For example, "REPLY" refers to
the method for replying to a "REQUEST".
CAP commands are referred to by upper-case, quoted-strings of text,
followed by the word "command". For example, '"CREATE" command'
refers to the command for creating a calendar entry, '"SEARCH"
command' refers to the command for reading calendar components. CAP
commands are named using the "CMD" property.
Properties defined by this memo are referred to with capitalized,
quoted-strings of text, followed by the word "property". For
example, '"ATTENDEE" property' refers to the iCalendar property used
to convey the calendar address that has been invited to a "VEVENT" or
"VTODO" component.
Property parameters defined by this memo are referred to with
capitalized, quoted-strings of text, followed by the word
"parameter". For example, "PARTSTAT" parameter refers to the
iCalendar property parameter used to specify the participation status
of an attendee. Enumerated values defined by this memo are referred
to with capitalized text, either alone or followed by the word
"value".
Object states defined by this memo are referred to with capitalized,
quoted-strings of text, followed by the word "state". For example,
'"BOOKED" state' refers to an object in the booked state.
Within a query, the different parts are referred to as a "clause" and
its value as "clause value" and the clause name will be in uppercase
enclosed in quotes, for example, 'The "SELECT" claus' or 'if the
"SELECT" clause value contains ...'.
In tables, the quoted-string text is specified without quotes in
order to minimize the table length.
1.2. Related Documents
Implementers will need to be familiar with several other memos that,
along with this one, describe the Internet calendaring and scheduling
standards. These documents are as follows.
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RFC 4324 Calendar Access Protocol December 2005
[iCAL] (RFC 2445) specifies the objects, data types, properties and
property parameters used in the protocols, along with the
methods for representing and encoding them.
[iTIP] (RFC 2446) specifies an interoperability protocol for
scheduling between different installations.
[iMIP] (RFC 2447) specifies the Internet email binding for [iTIP].
[GUIDE] (RFC 3283) is a guide to implementers and describes the
elements of a calendaring system, how they interact with each
other, how they interact with end users, and how the standards
and protocols are used.
This memo does not attempt to repeat the specification of concepts
and definitions from these earlier memos. Where possible, references
are made to the memo that provides the specification of these
concepts and definitions.
1.3 Definitions
UNPROCESSED, BOOKED, DELETED - A conceptual state of an object in
the calendar store. There are three conceptual states:
"UNPROCESSED" state, "BOOKED" state, and marked for deletion,
which is the "DELETED" state. How the implementation stores the
state of any object is not a protocol issue and is not discussed.
An object can be said to be booked, unprocessed, or marked for
deletion.
1. An "UNPROCESSED" state scheduling object has been stored in
the calendar store but has not been acted on by a CU or CUA.
All scheduled entries are [iTIP] objects. No [iTIP] objects
in the store are in the "BOOKED" state. To retrieve any
[iTIP] object, simply do a query asking for any objects that
are stored in the "UNPROCESSED" state.
2. A "BOOKED" state entry is stored with the "CREATE" command.
It is an object that has been acted on by a CU or CUA and
there has been a decision to store an object. To retrieve any
booked object, simply do a query asking for any objects that
were stored in the "BOOKED" state.
3. A "DELETED" state entry is created by sending a "DELETE"
command with the "OPTION" parameter value set to "MARK". To
retrieve any deleted object, simply do a query asking for any
objects that were stored in the "DELETED" state. By default
objects marked for delete are not returned. The CUA must
specifically ask for marked-for-deletion objects. You cannot
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RFC 4324 Calendar Access Protocol December 2005
ask for components in the "DELETED" state and in other states
in the same "VQUERY" component, as there would be no way to
distinguish between them in the reply.
Calendar - A collection of logically related objects or entities
each of which may be associated with a calendar date and possibly
time of day. These entities can include calendar properties or
components. In addition, a calendar might be related to other
calendars with the "RELATED-TO" property. A calendar is
identified by its unique calendar identifier. The [iCAL] defines
the initial calendar properties, calendar components and
properties that make up the contents of a calendar.
Calendar Access Protocol (CAP) - The Internet protocol that permits
a CUA to access and manipulate calendars residing on a Calendar
Store. (This memo.)
Calendar Access Rights (VCAR) - The mechanism for specifying the CAP
operations ("PERMISSION") that a particular calendar user ("UPN",
defined below) is granted or denied permission to perform on a
given calendar object ("SCOPE"). The calendar access rights are
specified with a "VCAR" component. (Section 9.3)
Calendar Address - Also see Calendar URL, which is the same as a CAP
address. The calendar address can also be the value to the
"ATTENDEE" and "ORGANIZER" properties, as defined in [iCAL].
Calendar URL - A calendar URL is a URL, defined in this memo,
that specifies the address of a CS or Calendar.
Component - Any object that conforms to the iCalendar object format
and that is either defined in an Internet Draft, registered with
IANA, or is an experimental object that is prefixed with "x-".
Some types of components include calendars, events, to-dos,
journals, alarms, and time zones. A component consists of
properties and possibly other contained components. For example,
an event may contain an alarm component.
Container - This is a generic name for VCALSTORE or VAGENDA.
Properties - An attribute of a particular component. Some
properties are applicable to different types of components. For
example, the "DTSTART" property is applicable to the "VEVENT",
"VTODO", and "VJOURNAL" components. Other components are
applicable only to an individual type of calendar component. For
example, the "TZURL" property may only be applicable to the
"VTIMEZONE" components.
Royer, et al. Experimental PAGE 8
RFC 4324 Calendar Access Protocol December 2005
Calendar Identifier (CALID) - A globally unique identifier
associated with a calendar. Calendars reside within a CS. See
Qualified Calendar Identifier and Relative Calendar Identifier.
All CALIDs start with "cap:".
Calendar Policy - A CAP operational restriction on the access or
manipulation of a calendar. These may be outside the scope of the
CAP protocol. An example of an implementation or site policy is,
"events MUST be scheduled in unit intervals of one hour".
Calendar Property - An attribute of a calendar ("VAGENDA"). The
attribute applies to the calendar, as a whole. For example, the
"CALSCALE" property specifies the calendar scale (e.g., the
"GREGORIAN" value) for the all entries within the calendar.
Calendar Store (CS) - The data and service model definitions for a
Calendar Store as defined in this memo. This memo does not
specify how the CS is implemented.
Calendar Server - An implementation of a Calendar Store (CS) that
manages one or more calendars.
Calendar Store Identifier (CSID) - The globally unique identifier
for an individual CS. A CSID consists of the host and port
portions of a "Common Internet Scheme Syntax" part of a URL, as
defined by [URL]. The CSID excludes any reference to a specific
calendar. (Section 8.9)
Calendar Store Components - Components maintained in a CS specify a
grouping of calendar store-wide information.
Calendar Store Properties - Properties maintained in a Calendar
Store represent store-wide information.
Calendar User (CU) - An entity (often biological) that uses a
calendaring system.
Calendar User Agent (CUA) - The client application that a CU
utilizes to access and manipulate a calendar.
CAP Session - An open communication channel between a CUA and a CS.
If the CAP session is authenticated, the CU is "authenticated" and
it is an "authenticated CAP session".
Contained Component / Contained Properties - A component or property
that is contained inside of another component. For example, a
"VALARM" component may be contained inside a "VEVENT" component,
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RFC 4324 Calendar Access Protocol December 2005
and a "TRIGGER" property could be a contained property of a
"VALARM" component.
Delegate - A CU (sometimes called the delegatee) who has been
assigned participation in a scheduled component (e.g., VEVENT) by
one of the attendees in the scheduled component (sometimes called
the delegator). An example of a delegate is a team member told to
go to a particular meeting in place of another invitee who is
unable to attend.
Designate - A CU who is authorized to act on behalf of another CU.
An example of a designate is an assistant.
Experimental - The CUA and CS may implement experimental extensions
to the protocol. They might also have experimental components,
properties, and parameters. These extensions MUST start with "x-"
(or "X-") and should include a vendor prefix (such as "x-
myvendor-"). There is no guarantee that these experimental
extensions will interoperate with other implementations. There is
no guarantee that they will not interact in unpredictable ways
with other vendor experimental extensions. There is no guarantee
that the same specific experimental extension is not used by
multiple vendors in incompatible ways. Implementations should
limit sending those extensions to other implementations.
Object - A generic name for any component, property, parameter, or
value type to be used in iCalendar.
Overlapped Booking - A policy that indicates whether or not
components with a "TRANSP" property not set to "TRANSPARENT-
NOCONFLICT" or "OPAQUE-NOCONFLICT" value can overlap one another.
When the policy is applied to a calendar it indicates whether or
not the time span of any component (VEVENT, VTODO, ...) in the
calendar can overlap the time span of any other component in the
same calendar. When applied to an individual object, it indicates
whether or not any other component's time span can overlap that
individual component. If the CS does not allow overlapped
booking, then the CS is unwilling to allow any overlapped bookings
within any calendar or entry in the CS.
Owner - One or more CUs or UGs that are listed in the "OWNER"
property in a calendar. There can be more than one owner.
Qualified Calendar Identifier (Qualified CALID) - A CALID in which
both the scheme and CSID of the CAP URI are present.
Realm - A collection of calendar user accounts, identified by a
string. The name of the Realm is only used in UPNs. In order to
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RFC 4324 Calendar Access Protocol December 2005
avoid namespace conflict, the Realm SHOULD be postfixed with an
appropriate DNS domain name (e.g., the foobar Realm could be
called foobar.example.com).
Relative Calendar Identifier (Relative CALID) - An identifier for an
individual calendar in a calendar store. It MUST be unique within
a calendar store. A Relative CALID consists of the "URL path" of
the "Common Internet Scheme Syntax" portion of a URL, as defined
by [URI] and [URLGUIDE].
Session Identity - A UPN associated with a CAP session. A session
gains an identity after successful authentication. The identity
is used in combination with VCAR to determine access to data in
the CS.
User Group (UG) - A collection of Calendar Users and/or User Groups.
These groups are expanded by the CS and may reside either locally
or in an external database or directory. The group membership may
be fixed or dynamic over time.
Username - A name that denotes a Calendar User within a Realm. This
is part of a UPN.
User Principal Name (UPN) - A unique identifier that denotes a CU or
a group of CUs. (Section 6.1.2)
2. Additions to iCalendar
Several new components, properties, parameters, and value types are
added in CAP. This section summarizes those new objects.
This memo extends the properties that can go into 'calprops' as
defined in [iCAL] section 4.6 page 51, to allow [iTIP] objects
transmitted between a CAP aware CUA and the CS to contain the
"TARGET" and "CMD" properties. This memo also adds to the [iCAL]
ABNF to allow IANA and experimental extensions. This memo does not
address how a CUA transmits [iTIP] or [iMIP] objects to non-CAP
programs. What follows is ABNF, as described in [ABNF].
calprops= 2*(
; 'prodid' and 'version' are both REQUIRED,
; but MUST NOT occur more than once.
;
prodid /version /
;
; These are optional, but MUST NOT occur
; more than once.
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RFC 4324 Calendar Access Protocol December 2005
;
calscale /
method /
cmd /
;
; Target is optional, and may occur more
; than once.
;
target / other-props )
;
other-props = *(x-prop) *(iana-prop) *(other-props)
;
iana-prop = ; Any property registered by IANA directly or
; included in an RFC that may be applied to
; the component and within the rules published.
;
x-prop = ; As defined in [iCAL].
;
methodp = ; As defined in [iCAL].
;
prodid = ; As defined in [iCAL].
;
calscale = ; As defined in [iCAL].
;
Another change is that the 'component' part of the 'icalbody' ABNF as
described in [iCAL] section 4.6 is optional when sending a command,
as shown in the following updated ABNF:
icalbody = calprops component
; If the "VCALENDAR" component contains the "CMD"
; property then the 'component' is optional:
;
/ calprops ; Which MUST include a "CMD" property
;
component = ; As defined in [iCAL].
In addition, a problem exists with the control of "VALARM" components
and their "TRIGGER" properties. A CU may wish to set its own alarms
(local alarms) on components. These local alarms are not to be
forwarded to other CUs, CUAs, or CSs. Similarly, the "SEQUENCE"
property and the "ENABLE" parameter in local alarms are not to be
forwarded to other CUs, CUAs, or CSs. Therefore, for the protocol
between a CUA and a CS, the following changes from [iCAL] section
4.6.6 page 67 apply to the CAP protocol:
alarmc = "BEGIN" ":" "VALARM" CRLF
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RFC 4324 Calendar Access Protocol December 2005
alarm-seq
other-props
(audioprop / dispprop / emailprop / procprop)
"END" ":" "VALARM" CRLF
;
emailprop = ; As defined in [iCAL]
;
procprop = ; As defined in [iCAL]
;
dispprop = ; As defined in [iCAL]
;
audioprop = ; As defined in [iCAL]
;
alarm-seq = "SEQUENCE" alarmseqparams ":" posint0 CRLF
;
alarmseqparams = other-params [";" local-param] other-params
;
; Where DIGIT is defined in [iCAL]
;
posint0 = 1*DIGIT
posint1 = posintfirst 1*DIGIT
;
; A number starting with 1 through 9.
;
posintfirst = %x31-39
;
other-params = *(";" xparam) *(";" iana-params)
*(";" other-params)
;
iana-params = ; Any parameter registered by IANA directly or
; included in an RFC that may be applied to
; the property and within the rules published.
;
xparam ; As defined in [iCAL].
;
The CUA adds a "SEQUENCE" property to each "VALARM" component as it
books the component. This property, along with the "LOCAL" and
"ENABLE" parameters, allows the CUA to uniquely identify any VALARM
in any component. The CUA should remove those before forwarding to
non-CAP-aware CUAs.
In addition, if a CUA wished to ignore a "TRIGGER" property in a
"VALARM" component that was supplied to it by the "Organizer", the
CUA needs a common way to tag that trigger as disabled. So the
following is a modification to [iCAL] section 4.8.6.3 page 127:
trigger = "TRIGGER" 1*(";" enable-param) (trigrel / trigabs)
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RFC 4324 Calendar Access Protocol December 2005
;
trigrel = ; As defined in [iCAL].
;
trigabs = ; As defined in [iCAL].
See Section 7.2 and Section 7.5.
2.1. New Value Types (Summary)
UPN: The UPN value type is a text value type restricted to only UPN
values (see Section 6.1.2).
UPN-FILTER: Like the UPN value type, but also includes filter rules
that allow wildcards (see Section 6.1.3).
CALQUERY: The "CAL-QUERY" value type is a query syntax that is used
by the CUA to specify the rules that apply to a CAP command (see
Section 6.1.1).
2.1.1. New Parameters (summary)
ACTION - The "ACTION" parameter informs the endpoint if it should
abort or ask to continue on timeout. (Section 7.1)
ENABLE - The "ENABLE" parameter in CAP is used to tag a property in
a component as disabled or enabled. (Section 7.2)
ID - The "ID" parameter specifies a unique identifier to be used for
any outstanding commands.
LATENCY - The "LATENCY" parameter supplies the timeout value for
command completion to the other endpoint. (Section 7.4)
LOCAL - The "LOCAL" parameter in CAP is used to tag a property in a
component to signify that the component is local or to be
distributed. (Section 7.5)
LOCALIZE - The "LOCALIZE" parameter specifies the locale to be used
in error and warning messages.
OPTIONS - The "OPTIONS" parameter passes optional information for
the command being sent.
2.1.2. New or Updated Properties (summary)
ALLOW-CONFLICT - Some entries in a calendar might not be valid if
other entries were allowed to overlap the same time span.
(Section 8.1)
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RFC 4324 Calendar Access Protocol December 2005
ATT-COUNTER - When storing a "METHOD" property with the "COUNTER"
method, there needs to be a way to remember the "ATTENDEE" value
that sent the COUNTER. (Section 8.2)
CAP-VERSION - The version of CAP that the implementation supports.
(Section 8.5)
CAR-LEVEL - The level of calendar access supported. (Section 8.7)
COMPONENTS - The list of components supported. (Section 8.8)
CSID - The Calendar Store IDentifier (CSID) uniquely identifies a
CAP server. (Section 8.9)
CALID - Each calendar within a CS needs to be uniquely identifiable.
The "CALID" property identifies a unique calendar within a CS. It
can be a full CALID or a relative CALID. (Section 8.3)
CALMASTER - The "CALMASTER" property specifies the contact
information for the CS. (Section 8.4)
CARID - Access rights can be saved and fetched by unique ID - the
"CARID" property. (Section 8.6)
CMD - The CAP commands, as well as replies are transmitted using the
"CMD" property. (Section 10.1)
DECREED - Some access rights are not changeable by the CUA. When
that is the case, the "DECREED" property value in the "VCAR"
component will be "TRUE". (Section 8.10)
DEFAULT-CHARSET - The list of charsets supported by the CS. The
first entry is the default for the CS. (Section 8.11)
DEFAULT-LOCALE - The list of locales supported by the CS. The first
entry in the list is the default locale. (Section 8.12)
DEFAULT-TZID - This is the list of known timezones supported. The
first entry is the default. (Section 8.13)
DEFAULT-VCARS - A list of the "CARID" properties that will be used
to create new calendars. (Section 8.14)
DENY - The UPNs listed in the "DENY" property of a "VCAR" component
will be denied access, as described in the "VRIGHT" component.
(Section 8.15)
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RFC 4324 Calendar Access Protocol December 2005
EXPAND - This property tells the CS if the query reply should expand
components into multiple instances. The default is "FALSE" and is
ignored for CSs that cannot expand recurrence rules. (Section
8.16)
GRANT - The UPNs listed in the "GRANT" property of a "VCAR"
component will be allowed access as described in the "VRIGHT"
component. (Section 8.17)
ITIP-VERSION - The version of [iTIP] supported. (Section 8.18)
MAXDATE - The maximum date supported by the CS. (Section 8.20)
MAX-COMP-SIZE - The largest component size allowed in the
implementation including attachments in octets. (Section 8.19)
MINDATE - The minimum date supported by the CS. (Section 8.21)
MULTIPART - Passed in the capability messages to indicate which MIME
multipart types the sender supports. (Section 8.22)
NAME - The "NAME" property is used to add locale-specific
descriptions into components. (Section 8.23)
OWNER - Each calendar has at least one "OWNER" property. (xref
target="OWNER"/>) Related to the "CAL-OWNERS()" query clause.
(Section 6.1.1.1)
PERMISSION - This property specifies the permission being granted or
denied. Examples are the "SEARCH" and "MODIFY" values. (Section
8.25)
QUERY - Used to hold the CAL-QUERY (Section 8.26) for the component.
QUERYID - A unique id for a stored query. (Section 8.27)
QUERY-LEVEL - The level of the query language supported. (Section
8.28)
RECUR-ACCEPTED - If the implementation support recurrence rules.
(Section 8.29)
RECUR-EXPAND - If the implementation support expanding recurrence
rules. (Section 8.31)
RECUR-LIMIT - Any maximum limit on the number of instances the
implementation will expand recurring objects. (Section 8.30)
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REQUEST-STATUS - The [iCAL] "REQUEST-STATUS" property is extended to
include new error numbers.
RESTRICTION - In the final check when granting calendar access
requests, the CS test the results of a command for the value of
the "RESTRICTION" property in the corresponding "VRIGHT"
component, to determine if the access meets that restriction.
(Section 8.32)
SCOPE - The "SCOPE" property is used in "VRIGHT"s component to
select the subset of data that may be acted upon when checking
access rights. (Section 8.33)
SEQUENCE - When the "SEQUENCE" property is used in a "VALARM"
component, it uniquely identifies the instances of the "VALARM"
within that component.
STORES-EXPANDED - Specifies if the implementation stores recurring
objects expanded or not. (Section 8.34)
TARGET - The new "VCALENDAR" component property "TARGET" (Section
8.35) is used to specify which calendar(s) will be the subject of
the CAP command.
TRANSP - This is a modification of the [iCAL] "TRANSP" property and
it allows more values. The new values are related to conflict
control. (Section 8.36)
2.1.3. New Components (summary)
VAGENDA - CAP allows the fetching and storing of the entire contents
of a calendar. The "VCALENDAR" component is not sufficient to
encapsulate all of the needed data that describes a calendar. The
"VAGENDA" component is the encapsulating object for an entire
calendar. (Section 9.1)
VCALSTORE - Each CS contains one or more calendars (VAGENDAs), the
"VCALSTORE" component is the encapsulating object that can hold
all of the "VAGENDA" components along with any components and
properties that are unique to the store level. (Section 9.2)
VCAR - Calendar Access Rights are specified and encapsulated in the
new iCalendar "VCAR" component. The "VCAR" component holds some
new properties and at least one "VRIGHT" component. (Section 9.3)
VRIGHT - This component encapsulates a set of instructions to the
CS to define the rights or restrictions needed. (Section 9.4)
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VREPLY - This component encapsulates a set of data that can consist
of an arbitrary number of properties and components. Its contents
are dependent on the command that was issued. (Section 9.5)
VQUERY - The search operation makes use of a new component, called
"VQUERY" and a new value type "CAL-QUERY" (Section 6.1.1). The
"VQUERY" component is used to fetch objects from the CS. (Section
9.6)
2.2. Relationship of RFC 2446 (ITIP) to CAP
[iTIP] describes scheduling methods that result in indirect
manipulation of components. In CAP, the "CREATE" command is used to
deposit entities into the store. Other CAP commands, such as
"DELETE", "MODIFY", and "MOVE" command values, provide direct
manipulation of components. In the CAP calendar store model,
scheduling messages are conceptually kept separate from other
components by their state.
All scheduling operations are as defined in [iTIP]. This memo makes
no changes to any of the methods or procedures described in [iTIP].
In this memo, referring to the presence of the "METHOD" property in
an object is the same as saying an [iTIP] object.
A CUA may create a "BOOKED" state object by depositing an iCalendar
object into the store. This is done by depositing an object that
does not have a "METHOD" property. The CS then knows to set the
state of the object to the "BOOKED" state. If the object has a
"METHOD" property, then the object is stored in the "UNPROCESSED"
state.
If existing "UNPROCESSED" state objects exist in the CS for the same
UID (UID is defined in [iCAL]), then a CUA may wish to consolidate
the objects into one "BOOKED" state object. The CUA would fetch the
"UNPROCESSED" state objects for that UID and process them in the CUA
as described in [iTIP]. Then, if the CUA wished to book the UID, the
CUA would issue a "CREATE" command to create the new "BOOKED" state
object in the CS, followed by a "DELETE" command to remove any
related old [iTIP] objects from the CS. It might also involve the
CUA sending some [iMIP] objects or contacting other CSs and
performing CAP operations on those CSs.
The CUA could also decide not to book the object. In this case, the
"UNPROCESSED" state objects could be removed from the CS, or the CUA
could set those objects to the marked-for-delete state. The CUA
could also ignore objects for later processing.
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RFC 4324 Calendar Access Protocol December 2005
The marked-for-delete state is used to keep the object around so that
the CUA can process duplicate requests automatically. If a duplicate
[iTIP] object is deposited into the CS and there exists identical
marked-for-delete objects, then a CUA acting on behalf of the "OWNER"
can silently drop those duplicate entries.
Another purpose for the marked-for-delete state is so that, when a CU
decides they do not wish to have the object show in their calendar,
the CUA can book the object by changing the "PARTSTAT" parameter to
"DECLINED" in the "ATTENDEE" property that corresponds to their UPN.
Then the CUA can perform [iTIP] processing such as sending back a
decline, and then mark that object as marked-fo-delete. The CUA
might be configurable to automatically drop any updates for that
object, knowing the CU has already declined.
When synchronizing with multiple CUAs, the marked-for-delete state
could be used to inform the synchronization process that an object is
to be deleted. How synchronization is done is not specified in this
memo.
Several "UNPROCESSED" state entries can be in the CS for the same
UID. However, once consolidated, only one object exists in the CS
and that is the booked object. The other objects MUST be removed or
have their state changed to "DELETED".
There MUST NOT be more than one "BOOKED" state object in a calendar
for the same "UID". The "ADD" method value may create multiple
objects in the "BOOKED" state for the same UID; however, for the
purpose of this memo, they are the same object and simply have
multiple "VCALENDAR" components.
For example, if you were on vacation, you could have received a
"REQUEST" method to attend a meeting and several updates to that
meeting. Your CUA would have to issue "SEARCH" commands to find them
in the CS using CAP, process them, and determine the final state of
the object from a possible combination of user input and programmed
logic. Then the CUA would instruct the CS to create a new booked
object from the consolidated results. Finally, the CUA could do a
"DELETE" command to remove the related "UNPROCESSED" state objects.
See [iTIP] for details on resolving multiple [iTIP] scheduling
entries.
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3. CAP Design
3.1. System Model
The system model describes the high level components of a calendar
system and how they interact with each other.
CAP is used by a CUA to send commands to, and receive responses from,
a CS.
The CUA prepares a [MIME] encapsulated message, sends it to the CS,
and receives a [MIME] encapsulated response. The calendaring-related
information within these messages are represented by iCalendar
objects. In addition, the "GET-CAPABILITY" command can be sent from
the CS to the CUA.
There are two distinct protocols in operation to accomplish this
exchange. [BEEP] is the transport protocol used to move these
encapsulations between a CUA and a CS. CAP's [BEEP] profile defines
the application protocol that specifies the content and semantics of
the messages sent between the CUA and the CS.
3.2. Calendar Store Object Model
[iCAL] describes components such as events, todos, alarms, and
timezones. CAP requires additional object infrastructure, in
particular, detailed definitions of the containers for events and
todos (calendars), access control objects, and a query language.
The conceptual model for a calendar store is shown below. The
calendar store (VCALSTORE - Section 9.2) contains "VCAR"s, "VQUERY"s,
"VTIMEZONE"s, "VAGENDA"s and calendar store properties.
Calendars (VAGENDAs) contain "VEVENT"s, "VTODO"s, "VJOURNAL"s,
"VCAR"s, "VTIMEZONE"s, "VFREEBUSY", "VQUERY"s, and calendar
properties.
The component "VCALSTORE" is used to denote the root of the calendar
store and contains all of the calendars.
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Calendar Store
VCALSTORE
|
+-- properties
+-- VCARs
+-- VQUERYs
+-- VTIMEZONEs
+-- VAGENDA
| |
| +--properties
| +--VEVENTs
| | |
| | +--VALARMs
| +--VTODOs
| | |
| | +--VALARMs
| +--VJOURNALs
| +--VCARs
| +--VTIMEZONEs
| +--VQUERYs
| +--VFREEBUSYs
| |
| | ...
.
.
+-- VAGENDA
. .
. .
. .
Calendars within a Calendar Store are identified by their unique
Relative CALID.
3.3. Protocol Model
CAP uses [BEEP] as the transport and authentication protocol.
The initial charset MUST be UTF-8 for a session in an unknown locale.
If the CS supplied the [BEEP] 'localize' attribute in the [BEEP]
'greeting', then the CUA may tell the CS to switch locales for the
session by issuing the "SET-LOCALE" CAP command and supplying one of
the locales supplied by the [BEEP] 'localize' attribute. If a locale
is supplied, the first locale in the [BEEP] 'localize' attribute is
the default locale of the CS. The locale is switched only after a
successful reply.
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The "DEFAULT-CHARSET" property of the CS contains the list of
charsets supported by the CS with the first value being the default
for new calendars. If the CUA wishes to switch to one of those
charsets for the session, the CUA issues the "SET-LOCALE" command.
The CUA would have to first perform a "GET-CAPABILITY" command on the
CS to get the list of charsets supported by the CS. The charset is
switched only after a successful reply.
The CUA may switch locales and charsets as needed. There is no
requirement that a CS support multiple locales or charsets.
3.3.1. Use of BEEP, MIME, and iCalendar
CAP uses the [BEEP] application protocol over TCP. Refer to [BEEP]
and [BEEPTCP] for more information. The default port on which the CS
listens for connections is user port 1026.
The [BEEP] data exchanged in CAP is a iCalendar MIME content that
fully conforms to [iCAL] iCalendar format.
This example tells the CS to generate and return 10 UIDs to be used
by the CUA. Note that throughout this memo, 'C:' refers to what the
CUA sends, 'S:' refers to what the CS sends, 'I:' refers to what the
initiator sends, and 'L:' refers to what the listener sends. Here
initiator and listener are used as defined in [BEEP].
C: MSG 1 2 . 432 62
C: Content-Type: text/calendar
C:
C: BEGIN:VCALENDAR
C: VERSION:2.0
C: PRODID:-//someone's prodid
C: CMD;ID=unique-per-cua-123;OPTIONS=10:GENERATE-UID
C: END:VCALENDAR
NOTE: The following examples will not include the [BEEP] header and
footer information. Only the iCalendar objects that are sent between
the CUA and CS will be shown because the [BEEP] payload boundaries
are independent of CAP.
The commands listed below are used to manipulate or access the data
on the calendar store:
ABORT - Sent to halt the processing of some of the commands.
(Section 10.2)
CONTINUE - Sent to continue processing a command that has reached
its specified timeout time. (Section 10.3)
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CREATE - Create a new object on the CS. Initiated only by the CUA.
(Section 10.4)
SET-LOCALE - Tell the CS to use any named locale and charset
supplied. Initiated by the CUA only. (Section 10.13)
DELETE - Delete objects from the CS. Initiated only by the CUA.
Can also be used to mark an object for deletion. (Section 10.5)
GENERATE-UID - Generate one or more unique ids. Initiated only by
the CUA. (Section 10.6)
GET-CAPABILITY - Query the capabilities of the other end point of the
session. (Section 10.7)
IDENTIFY - Set a new identity for the session. Initiated only by
the CUA. (Section 10.8)
MODIFY - Modify components. Initiated by the CUA only. (Section
10.9)
MOVE - Move components to another container. Initiated only by the
CUA. (Section 10.10)
REPLY - When replying to a command, the "CMD" value will be set to
"REPLY" so that it will not be confused with a new command.
(Section 10.11)
SEARCH - Search for components. Initiated only by the CUA.
(Section 10.12)
TIMEOUT - Sent when a specified amount of time has lapsed and a
command has not finished. (Section 10.14)
4. Security Model
BEEP transport performs all session authentication.
4.1. Calendar User and UPNs
A CU is an entity that can be authenticated. It is represented in
CAP as a UPN, which is a key part of access rights. The UPN
representation is independent of the authentication mechanism used
during a particular CUA/CS interaction. This is because UPNs are
used within VCARs. If the UPN were dependent on the authentication
mechanism, a VCAR could not be consistently evaluated. A CU may use
one mechanism while using one CUA, but the same CU may use a
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RFC 4324 Calendar Access Protocol December 2005
different authentication mechanism when using a different CUA, or
while connecting from a different location.
The user may also have multiple UPNs for various purposes.
Note that the immutability of the user's UPN may be achieved by using
SASL's authorization identity feature. The transmitted authorization
identity may be different than the identity in the client's
authentication credentials [SASL, section 3]. This also permits a CU
to authenticate using their own credentials, yet request the access
privileges of the identity for which they are proxying SASL. Also,
the form of authentication identity supplied by a service like TLS
may not correspond to the UPNs used to express a server's access
rights, requiring a server-specific mapping to be done. The method
by which a server determines a UPN, based on the authentication
credentials supplied by a client, is implementation-specific. See
[BEEP] for authentication details; [BEEP] relies on SASL.
4.1.1. UPNs and Certificates
When using X.509 certificates for purposes of CAP authentication, the
UPN should appear in the certificate. Unfortunately, there is no
single correct guideline for which field should contain the UPN.
Quoted from RFC 2459, section 4.1.2.6 (Subject):
If subject naming information is present only in the
subjectAlt-Name extension (e.g., a key bound only to an email
address or URI), then the subject name MUST be an empty
sequence and the subjectAltName extension MUST be critical.
Implementations of this specification MAY use these comparison
rules to process unfamiliar attribute types (i.e., for name
chaining). This allows implementations to process certificates
with unfamiliar attributes in the subject name.
In addition, legacy implementations exist where an RFC 2822
name [RFC 2822] is embedded in the subject distinguished name as
an EmailAddress attribute. The attribute value for
EmailAddress is of type IA5String to permit inclusion of the
character '@', which is not part of the PrintableString
character set. EmailAddress attribute values are not case
sensitive (e.g., "fanfeedback@redsox.example.com" is the same
as "FANFEEDBACK@REDSOX.EXAMPLE.COM").
Conforming implementations generating new certificates with
electronic mail addresses MUST use the rfc822Name in the
subject alternative name field (see sec. 4.2.1.7 of [X509CRL])
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RFC 4324 Calendar Access Protocol December 2005
to describe such identities. Simultaneous inclusion of the
EmailAddress attribute in the subject distinguished name to
support legacy implementations is deprecated but permitted.
Since no single method of including the UPN in the certificate will
work in all cases, CAP implementations MUST support the ability to
configure what the mapping will be by the CS administrator.
Implementations MAY support multiple mapping definitions, for
example, the UPN may be found in either the subject alternative name
field, or the UPN may be embedded in the subject distinguished name
as an EmailAddress attribute.
Note: If a CS or CUA is validating data received via [iMIP], if the
"ORGANIZER" or "ATTENDEE" properties said, for example,
"ATTENDEE;CN=Joe Random User:MAILTO:juser@example.com", then the
email address should be checked against the UPN. This is so the
"ATTENDEE" property cannot be changed to something misleading like
"ATTENDEE;CN=Joe Rictus User:MAILTO:jrictus@example.com" and have it
pass validation. Note that it is the email addresses that
miscompare, the CN miscompare is irrelevant.
4.1.2. Anonymous Users and Authentication
Anonymous access is often desirable. For example, an organization
may publish calendar information that does not require any access
control for viewing or login. Conversely, a user may wish to view
unrestricted calendar information without revealing their identity.
4.1.3. User Groups
A User Group is used to represent a collection of CUs or other UGs
that can be referenced in VCARs. A UG is represented in CAP as a
UPN. The CUA cannot distinguish between a UPN that represents a CU
or a UG.
UGs are expanded as necessary by the CS. The CS MAY expand a UG
(including nested UGs) to obtain a list of unique CUs. Duplicate
UPNs are filtered during expansion.
How the UG expansion is maintained across commands is
implementation-specific. A UG may reference a static list of
members, or it may represent a dynamic list. Operations SHOULD
recognize changes to UG membership.
CAP does not define commands or methods for managing UGs.
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4.2. Access Rights
Access rights are used to grant or deny access to calendars,
components, properties, and parameters in a CS to a CU. CAP defines
a new component type called a Calendar Access Right (VCAR).
Specifically, a "VCAR" component grants, or denies, UPNs the right to
search and write components, properties, and parameters on calendars
within a CS.
The "VCAR" component model does not put any restriction on the
sequence in which the object and access rights are created. That is,
an object associated with a particular "VCAR" component might be
created before or after the actual "VCAR" component is defined. In
addition, the "VCAR" and "VEVENT" components might be created in the
same iCalendar object and passed together in a single object.
All rights MUST be denied unless specifically granted.
If two rights specified in "VCAR" components are in conflict, the
right that denies access always takes precedence over the right that
grants access. Any attempt to create a "VCAR" component that
conflicts with a "VCAR" components with a "DECREED" property set to
the "TRUE" value must fail.
4.2.1. Access Control and NOCONFLICT
The "TRANSP" property can take on values -- "TRANSPARENT-NOCONFLICT"
and "OPAQUE-NOCONFLICT" -- that prohibit other components from
overlapping it. This setting overrides access. The "ALLOW-CONFLICT"
CS, Calendar or component setting may also prevent overlap, returning
an error code "6.3".
4.2.2. Predefined VCARs
The predefined calendar access CARIDs that MUST be implemented are:
CARID:READBUSYTIMEINFO - Specifies the "GRANT" and "DENY" rules
that allow UPNs to search "VFREEBUSY" components. An example
definition for this VCAR is:
BEGIN:VCAR
CARID:READBUSYTIMEINFO
BEGIN:VRIGHT
GRANT:*
PERMISSION:SEARCH
SCOPE:SELECT * FROM VFREEBUSY WHERE STATE() = 'BOOKED'
END:VRIGHT
END:VCAR
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CARID:REQUESTONLY - Specifies the "GRANT" and "DENY" rules to
UPNs other than the owner of the calendar and specifies the
ability to write new objects with the "METHOD" property set to
the "REQUEST" value. This CARID allows the owner to specify
which UPNs are allowed to make scheduling requests. An example
definition for this VCAR is:
BEGIN:VCAR
CARID:REQUESTONLY
BEGIN:VRIGHT
GRANT:NON CAL-OWNERS()
PERMISSION:CREATE
RESTRICTION:SELECT VEVENT FROM VAGENDA
WHERE METHOD = 'REQUEST'
RESTRICTION:SELECT VTODO FROM VAGEND
WHERE METHOD = 'REQUEST'
RESTRICTION:SELECT VJOURNAL FROM VAGEND
WHERE METHOD = 'REQUEST'
END:VRIGHT
END:VCAR
CARID:UPDATEPARTSTATUS - Grants authenticated users the right to
modify the instances of the "ATTENDEE" property set to one of
their calendar addresses in any components for any booked
component containing an "ATTENDEE" property. This allows (or
denies) a CU the ability to update their own participation
status in a calendar where they might not otherwise have
"MODIFY" command access. They are not allowed to change the
"ATTENDEE" property value. An example definition for this VCAR
(only affecting the "VEVENT" components) is:
BEGIN:VCAR
CARID:UPDATEPARTSTATUS
BEGIN:VRIGHT
GRANT:*
PERMISSION:MODIFY
SCOPE:SELECT ATTENDEE FROM VEVENT
WHERE ATTENDEE = SELF()
AND ORGANIZER = CURRENT-TARGET()
AND STATE() = 'BOOKED'
RESTRICTION:SELECT * FROM VEVENT
WHERE ATTENDEE = SELF()
END:VRIGHT
END:VCAR
CARID:DEFAULTOWNER - Grants to any owner the permission they have
for the target. An example definition for this VCAR is:
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RFC 4324 Calendar Access Protocol December 2005
BEGIN:VCAR
CARID:DEFAULTOWNER
BEGIN:VRIGHT
GRANT:CAL-OWNERS()
PERMISSION:*
SCOPE:SELECT * FROM VAGENDA
END:VRIGHT
END:VCAR
4.2.3. Decreed VCARs
A CS MAY choose to implement and allow persistent immutable VCARs
that may be configured by the CS administrator. A reply from the CS
may dynamically create "VCAR" components that are decreed depending
on the implementation. To the CUA, any "VCAR" component with the
"DECREED" property set to "TRUE" cannot be changed by the currently
authenticated UPN, and, depending on the implementation and other
"VCAR" components, might not be able to be changed by any UPN using
CAP (never when the CUA gets a "DECREED:TRUE" VCAR).
When a user attempts to modify or override a decreed "VCAR" component
rules, an error will be returned indicating that the user has
insufficient authorization to perform the operation. The reply to
the CUA MUST be the same as if a non-decreed VCAR caused the failure.
The CAP protocol does not define the semantics used to initially
create a decreed VCAR. This administrative task is outside the scope
of the CAP protocol.
For example, an implementation or a CS administrator may wish to
define a VCAR that will always allow the calendar owners to have full
access to their own calendars.
Decreed "VCAR" components MUST be readable by the calendar owner in
standard "VCAR" component format.
4.3. CAP Session Identity
A [BEEP] session has an associated set of authentication credentials,
from which is derived a UPN. This UPN is the identity of the CAP
session, and is used to determine access rights for the session.
The CUA may change the identity of a CAP session by calling the
"IDENTIFY" command. The CS only permits the operation if the
session's authentication credentials are good for the requested
identity. The method of checking this permission is implementation-
dependent, but it may be thought of as a mapping from authentication
credentials to UPNs. The "IDENTIFY" command allows a single set of
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RFC 4324 Calendar Access Protocol December 2005
authentication credentials to choose from multiple identities, and
allows multiple sets of authentication credentials to assume the same
identity.
For anonymous access, the identity of the session is "@". A UPN with
a null Username and null Realm is anonymous. A UPN with a null
Username but non-null Realm (e.g.,"@example.com") may be used to mean
any identity from that Realm. This is useful to grant access rights
to all users in a given Realm. A UPN with a non-null Username and
null Realm (e.g., "bob@") could be a security risk and MUST NOT be
used.
Because the UPN includes Realm information, it may be used to govern
calendar store access rights across Realms. However, governing
access rights across Realms is only useful if login access is
available. This could be done through a trusted server relationship
or a temporary account. Note that trusted server relationships are
outside the scope of CAP.
The "IDENTIFY" command also provides for a weak group implementation.
By allowing multiple sets of authentication credentials belonging to
different users to identify as the same UPN, that UPN essentially
identifies a group of people, and may be used for group calendar
ownership, or the granting of access rights to a group.
5. CAP URL and Calendar Address
The CAP URL scheme is used to designate both calendar stores and
calendars accessible using the CAP protocol.
The CAP URL scheme conforms to the generic URL syntax defined in RFC
2396 and follows the Guidelines for URL Schemes set forth in RFC
2718.
A CAP URL begins with the protocol prefix "cap" and is defined by the
following grammar.
capurl = "cap://" csidpart [ "/" relcalid ]
;
csidpart = hostport ; As defined in Section 3.2.2 of RFC 2396
;
relcalid = *uric ; As defined in Section 2 of RFC 2396
A 'relcalid' is an identifier that uniquely identifies a calendar on
a particular calendar store. There is no implied structure in a
Relative CALID (relcalid). It may refer to the calendar of a user or
of a resource such as a conference room. It MUST be unique within
the calendar store.
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RFC 4324 Calendar Access Protocol December 2005
Here are some examples:
cap://cal.example.com
cap://cal.example.com/Company/Holidays
cap://cal.example.com/abcd1234Usr
A 'relcalid' is permitted and is resolved according to the rules
defined in Section 5 of RFC 2396.
Examples of valid relative CAP URLs:
opqaueXzz123String
UserName/Personal
Calendar addresses can be described as qualified or relative CAP
URLs.
For a user currently authenticated to the CS on cal.example.com,
these two example calendar addresses refer to the same calendar:
cap://cal.example.com/abcd1234USR
abcd1234USR
6. New Value Types
The following sections contains new components, properties,
parameters, and value definitions.
The purpose of these is to extend the iCalendar objects in a
compatible way so that existing iCalendar "VERSION" property "2.0"
value parsers can still parse the objects without modification.
6.1. Property Value Data Types
6.1.1. CAL-QUERY Value Type
Subject: Registration of text/calendar MIME value type CAL-QUERY
Value Name: CAL-QUERY
Value Type Purpose: This value type is used to identify values and
contains query statements targeted at locating those values. This
is based on [SQL92] and [SQLCOM].
1. For the purpose of a query, all components should be handled
as tables, and the properties of those components should be
handled as columns.
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RFC 4324 Calendar Access Protocol December 2005
2. All VAGENDAs and CSs look like tables for the purpose of a
QUERY, and all of their properties look like columns in those
tables.
3. You MUST NOT do any cross-component-type joins. That means
you can ONLY have one component OR one "VAGENDA" component OR
one "VCALSTORE" component in the "FROM" clause.
4. Everything in the "SELECT" clause and "WHERE" clauses MUST be
from the same component type or "VAGENDA" component OR
"VCALSTORE" component in the "FROM" clause.
5. When multiple "QUERY" properties are supplied in a single
"VQUERY" component, the results returned are the same as the
results returned for multiple "VQUERY" components that each
have a single "QUERY" property.
6. The '.' is used to separate the table name (component) and
column name (property or component) when selecting a property
that is contained inside a component that is targeted in the
TARGET property.
7. A contained component without a '.' is not the same as
"component-name.*". If given as "component-name" (no dot),
the encapsulating BEGIN/END statement will be supplied for
"component-name".
In the following example, '.' is used to separate the "TRIGGER"
property from its contained component (VALARM), which is contained in
any "VEVENT" component in the selected "TARGET" property value (a
relcalid). All "TRIGGER" properties in any "VEVENT" component in
relcalid would be returned.
TARGET:relcalid
QUERY:SELECT VALARM.TRIGGER FROM VEVENT
SELECT VALARM FROM VEVENT WHERE UID = "123"
This returns one BEGIN/END "VALARM" component for each "VALARM"
component in the matching "VEVENT" component. As there is no '.'
(dot) in the VALARM after the SELECT above, it returns:
Royer, et al. Experimental PAGE 31
RFC 4324 Calendar Access Protocol December 2005
BEGIN:VALARM
TRIGGER;RELATED=END:PT5M
REPEAT:4
...
END:VALARM
BEGIN:VALARM
TRIGGER;RELATED=START:PT5M
DURATION:PT10M
...
END:VALARM
...
...
If the SELECT parameter is provided as "component-name.*", then only
the properties and any contained components will be returned. The
example:
SELECT VALARM.* FROM VEVENT WHERE UID = "123"
will return all of the properties in each "VALARM" component in the
matching "VEVENT" component:
TRIGGER;RELATED=END:PT5M
REPEAT:4
...
TRIGGER;RELATED=START:PT5M
DURATION:PT10M
...
...
In the following SELECT clauses:
(a) SELECT <a-property-name> FROM VEVENT
(b) SELECT VALARM FROM VEVENT
(c) SELECT VALARM.* FROM VEVENT
(d) SELECT * FROM VEVENT
(e) SELECT * FROM VEVENT WHERE
VALARM.TRIGGER < '20020201T000000Z'
AND VALARM.TRIGGER > '20020101T000000Z'
Clause (a) elects all instances of <a-property-name> from all "VEVENT"
components.
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RFC 4324 Calendar Access Protocol December 2005
Clauses (b) and (c) select all "VALARM" components from all "VEVENT"
components. (b) would return them in BEGIN/END VALARM tags. (c) would
return all of the properties without BEGIN/END VALARM tags.
Clause (d) selects every property and every component that is in any
"VEVENT" component, with each "VEVENT" component wrapped in a
BEGIN/END VEVENT tags.
Clause (e) selects all properties and all contained components in all
"VEVENT" components that have a "VALARM" component with a "TRIGGER"
property value between the provided dates and times, with each
"VEVENT" component wrapped in BEGIN/END VEVENT tags.
Here are two invalid SELECT clauses:
(f) SELECT VEVENT.VALARM.TRIGGER FROM VEVENT
(g) SELECT DTSTART,UID FROM VEVENT
WHERE VTODO.SUMMERY = "Fix typo in CAP"
Clause (f) is invalid because it contains two '.' characters.
Clause (g) Is invalid because it mixes VEVENT
and VTODO properties in the same VQUERY.
Formal Definition: The value type is defined by the following
notation:
cal-query = "SELECT" SP cap-val SP
"FROM" SP comp-name SP
"WHERE" SP cap-expr
/ "SELECT" SP cap-cols SP
"FROM" SP comp-name
;
cap-val = cap-cols / param
/ ( cap-val "," cap-val )
; NOTE: there is NO space around the "," on
; the next line
cap-cols = cap-col / ( cap-cols "," cap-col)
/ "*"
/ "*.*" ; only valid when the target is a "VAGENDA"
;
; A 'cap-col' is:
;
; Any property name ('cap-prop') found in the
; component named in the 'comp-name' used in the
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RFC 4324 Calendar Access Protocol December 2005
; "FROM" clause.
;
; SELECT ORGANIZER FROM VEVENT ...
;
; OR
;
; A component name ('comp-name') of an existing
; component contained inside of the 'comp-name'
; used in the "FROM" clause.
;
; SELECT VALARM FROM VEVENT ...
;
; OR
;
; A component name ('comp-name') of an existing
; component contained inside of the 'comp-name' used
; in the "FROM" clause followed by a property
; name ('cap-prop') to be selected from that
; component.
; (comp-name "." cap-prop)
; SELECT VALARM.TRIGGER FROM VEVENT ...
cap-col = comp-name
/ comp-name "." cap-prop
/ cap-prop
comp-name = "VEVENT" / "VTODO" / "VJOURNAL" / "VFREEBUSY"
/ "VALARM" / "DAYLIGHT" / "STANDARD" / "VAGENDA"
/ "VCAR" / "VCALSTORE" / "VQUERY" / "VTIMEZONE"
/ "VRIGHT" / x-comp / iana-comp
cap-prop = ; A property that may be in the 'cap-comp' named
; in the "SELECT" clause.
cap-expr = "(" cap-expr ")"
/ cap-term
cap-term = cap-expr SP cap-logical SP cap-expr
/ cap-factor
cap-logical= "AND" / "OR"
cap-factor = cap-colval SP cap-oper SP col-value
/ cap-colval SP "LIKE" SP col-value
/ cap-colval SP "NOT LIKE" SP col-value
/ cap-colval SP "IS NULL"
/ cap-colval SP "IS NOT NULL"
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RFC 4324 Calendar Access Protocol December 2005
/ col-value SP "IN" cap-colval
/ col-value SP "NOT IN" cap-colval
/ "STATE()" "=" ( "BOOKED"
/ "UNPROCESSED"
/ "DELETED"
/ iana-state
/ x-state )
;
iana-state = ; Any state registered by IANA directly or
; included in an RFC that may be applied to
; the component and within the rules published.
;
x-state = ; Any experimental state that starts with
; "x-" or "X-".
cap-colval = cap-col / param
;
param = "PARAM(" cap-col "," cap-param ")"
;
cap-param = ; Any parameter that may be contained in the cap-col
; in the supplied PARAM() function
col-value = col-literal
/ "SELF()"
/ "CAL-OWNERS()"
/ "CAL-OWNERS(" cal-address ")"
/ "CURRENT-TARGET()"
;
cal-address = ; A CALID as define by CAP
;
col-literal = "'" literal-data "'"
;
literal-data = ; Any data that matches the value type of the
; column that is being compared. That is, you
; cannot compare PRIORITY to "some string" because
; PRIORITY has a value type of integer. If it is
; not preceded by the LIKE element, any '%' and '_'
; characters in the literal data are not treated as
; wildcard characters and do not have to be
; backslash-escaped.
;
; OR
;
; If the literal-data is preceded by the LIKE
; element it may also contain the '%' and '_'
; wildcard characters. And, if the literal data
; that is comparing contains any '%' or '_'
; characters, they MUST be backslash-escaped as
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RFC 4324 Calendar Access Protocol December 2005
; described in the notes below, in order for them
; not to be treated as wildcard characters.
;
; And, if the literal data contains any characters
; that would have to be backslash-escaped if
; a property or parameter value, then they must
; be backslash-escaped in the literal-data.
; Also, the quote character (') must be backslash
; escaped. Example:
;
; ... WHERE SUBJECT = 'It\'s time to ski'
;
cap-oper = "="
/ "!="
/ "<"
/ ">"
/ "<="
/ ">="
;
SP = ; A single white space ASCII character
; (value in HEX %x20).
;
x-comp = ; As defined in [iCAL] section 4.6.
;
iana-comp = ; As defined in [iCAL] section 4.6.
6.1.1.1. [NOT] CAL-OWNERS()
This function returns the list of "OWNER" properties for the named
calendar when used in the "SELECT" clause.
If called as 'CAL-OWNERS()', it is equivalent to the comma-separated
list of all of the owners of the calendar that match the provided
"TARGET" property value. If the target is a "VCALSTORE", it returns
the "CALMASTER" property.
If called as 'CAL-OWNERS(cal-address)', then it is the equivalent to
the comma-separated list of owners for the named calendar id. If
'cal-address' is a CS, it returns the "CALMASTER" property.
If used in the "WHERE" clause, it returns true if the currently
authenticated UPN is an owner of the currently selected object
matched in the provided "TARGET" property. Used in a CAL-QUERY
"WHERE" clause and in the UPN-FILTER.
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6.1.1.2. CURRENT-TARGET()
This is equivalent to the value of the "TARGET" property in the
current command. It is used in a CAL-QUERY "WHERE" clause.
6.1.1.3. PARAM()
This is used in a CAL-QUERY. It returns or tests for the value of
the named parameter from the named property.
6.1.1.3.1. PARAM() in SELECT
When used in a "SELECT" clause, it returns the entire property and
all of that property's parameters; the result is not limited to the
supplied parameter. If the property does not contain the named
parameter, then the property is not returned. However, it could be
returned as a result of another "SELECT" clause value. If multiple
properties of the supplied name have the named parameter, all
properties with that named parameter are returned. If multiple
PARAM() clauses in a single "SELECT" CLAUSE match the same property,
then the single matching property is returned only once.
Also, note that many parameters have default values defined in [iCAL]
that must be treated as existing with their default value in the
properties, as defined in [iCAL], even when not explicitly present.
For example, if a query were performed with PARAM(ATTENDEE,ROLE) then
ALL "ATTENDEE" properties would match because, even when they do not
explicitly contain the "ROLE" parameter, it has a default value and
therefore must match.
Therefore, when PARAM() is used in a "SELECT" clause, it is more
accurate to say that it means return the property, if it contains the
named parameter explicitly in the property or simply because the
parameter has a default for that property.
6.1.1.3.2. PARAM() in WHERE
When PARAM() is used in the "WHERE" clause, a match is true when the
parameter value matches the compare clause (according to the supplied
WHERE values). If multiple named properties contain the named
parameter, then each parameter value is compared in turn to the
condition; if any match, the results would be true for that condition
the same as if only one had existed. Each matching property or
component is returned only once.
Because a parameter may be multi-valued, the comparison might need to
be done with an "IN" or "NOT IN" comparator.
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RFC 4324 Calendar Access Protocol December 2005
Given the following query:
ATTENDEE;PARTSTAT=ACCEPTED:cap://host.com/joe
SELECT VEVENT FROM VAGENDA
WHERE PARAM(ATTENDEE,PARTSTAT) = 'ACCEPTED'
Thus, all "VEVENT" components that contain one or more "ATTENDEE"
properties that have a "PARTSTAT" parameter with a "ACCEPTED" value
would be returned. Also, each uniquely matching VEVENT would be
returned only once, no matter how many "ATTENDEE" properties had
matching roles, in each unique "VEVENT" component.
Also note that many parameters have default values defined in [iCAL].
Therefore, if the following query were performed on the "ATTENDEE"
property in the above example:
SELECT VEVENT FROM VAGENDA
WHERE PARAM(ATTENDEE,ROLE) = 'REQ-PARTICIPANT'
It would return the "ATTENDEE" property shown above because the
default value for the "ROLE" parameter is "REQ-PARTICIPANT".
6.1.1.4. SELF()
Used in a CAL-QUERY "WHERE" clause. Returns the UPN of the currently
authenticated UPN or their current UPN as a result of an IDENTIFY
command.
6.1.1.5. STATE()
Returns one of three values, "BOOKED", "UNPROCESSED", or "DELETED"
depending on the state of the object. "DELETED" is a component in
the marked-for-delete state. Components that have been removed from
the store are never returned.
If not specified in a query then both "BOOKED" and "UNPROCESSED" data
is returned. Each unique "METHOD" property must be in a separate
MIME object, per the [iCAL] section 3.2 restriction.
6.1.1.6. Use of Single Quote
All literal values are surrounded by single quotes ('), not double
quotes ("), and not without any quotes. If the value contains quotes
or any other ESCAPED-CHAR, they MUST be backslash-escaped as
described in section 4.3.11 "Text" of [iCAL]. Any "LIKE" clause
wildcard characters that are part of any literal data that is
preceded by a "LIKE" clause or "NOT LIKE" clause and is not intended
Royer, et al. Experimental PAGE 38
RFC 4324 Calendar Access Protocol December 2005
to mean wildcard search MUST be escaped as described in note (7)
below.
6.1.1.7. Comparing DATE and DATE-TIME Values
When comparing "DATE-TIME" values to "DATE" values and when comparing
"DATE" values to "DATE-TIME" values, the result will be true if the
"DATE" value is on the same day as the "DATE-TIME" value. They are
compared in UTC no matter what time zone the data may have been
stored in.
Local time event, as described in section 4.2.19 of [iCAL], must be
considered to be in the CUA default timezone that was supplied by the
CUA in the "CAPABILITY" exchange.
VALUE-1 VALUE-2 Compare Results
20020304 20020304T123456 TRUE
(in UTC-3) (in UTC-3)
20020304 20020304T003456 FALSE
(in UTC) (in UTC-4)
20020304T003456Z 20020205T003456 FALSE
(in UTC-0) (in UTC-7)
When "DATE" values and "DATE-TIME" values are compared with the
"LIKE" clause, the comparison will be done as if the value is a
[iCAL] DATE or DATE-TIME string value.
LIKE '2002%' will match anything in the year 2002.
LIKE '200201%' will match anything in January 2002.
LIKE '%T000000' will match anything at midnight.
LIKE '____01__T%' will match anything for any year or
time that is in January.
(Four '_', '01', two '_' 'T%').
Using a "LIKE" clause value of "%00%", would return any value that
contained two consecutive zeros.
All comparisons will be done in UTC.
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RFC 4324 Calendar Access Protocol December 2005
6.1.1.8. DTEND and DURATION
The "DTEND" property value is not included in the time occupied by
the component. That is, a "DTEND" property value of 20030614T12000
includes all of the time up to, but not including, noon on that day.
The "DURATION" property value end time is also not inclusive. So an
object with a "DTSTART" property value of 20030514T110000 and a
"DURATION" property value of "1H" does not include noon on that day.
When a "QUERY" property value contains a "DTEND" value, then the CS
MUST also evaluate any existing "DURATION" property value and
determine if it has an effective end time that matches the "QUERY"
property supplied "DTEND" value or any range of values supplied by
the "QUERY" property.
When a "QUERY" property contains a "DURATION" value, then the CS MUST
also evaluate any existing "DTEND" property values and determine if
they have an effective duration that matches the value, or any range
of values, supplied by the "QUERY" property.
6.1.1.9. [NOT] LIKE
The pattern matching characters are the '%' that matches zero or more
characters, and '_' that matches exactly one character (where
character does not always mean octet).
"LIKE" clause pattern matches always cover the entire string. To
match a pattern anywhere within a string, the pattern must start and
end with a percent sign.
To match a '%' or '_' in the data and not have it interpreted as a
wildcard character, they MUST be backslash-escaped. Thus, to search
for a '%' or '_' in the string:
LIKE '%\%%' Matches any string with a '%' in it.
LIKE '%\_%' Matches any string with a '_' in it.
Strings compared using the "LIKE" clause MUST be performed using case
insensitive comparisoison assumes 'a' = 'A').
If the "LIKE" clause is preceded by 'NOT' then there is a match when
the string compare fails.
Some property values (such as the 'recur' value type), contain commas
and are not multi-valued. The CS must understand the objects being
compared and understand how to determine how any multi-valued or
multi-instances properties or parameter values are separated, quoted,
Royer, et al. Experimental PAGE 40
RFC 4324 Calendar Access Protocol December 2005
and backslash-escaped. THE CS must perform the comparisons as if
each value existed by itself and was not quoted or backslash-escaped,
when comparing using the LIKE element.
See related examples in Section 6.1.1.11.
6.1.1.10. Empty vs. NULL
When used in a CAL-QUERY value, "NULL" means that the property or
parameter is not present in the object. Paramaters that are not
provided and have a default value in the property are considered to
exist with their default value and will not be "NULL".
If the property exists but has no value, then "NULL" MUST NOT
match.
If the parameter exists but has no value, then "NULL" MUST NOT
match.
If the parameter not present and has a default value, then "NULL"
MUST NOT match.
If the property (or parameter) exists but has no value, then it
matches the empty string '' (quote quote).
6.1.1.11. [NOT] IN
This is similar to the "LIKE" clause, except it does value matching
and not string comparison matches.
Some iCalendar objects can be multi-instance and multi-valued. The
"IN" clause will return a match if the literal value supplied as part
of the "IN" clause is contained in the value of any instance of the
named property or parameter, or is in any of the multiple values in
the named property or parameter. Unlike the "LIKE" clause, the '%'
and '_' matching characters are not used with the "IN" clause and
have no special meaning.
BEGIN:A-COMPONENT
(a) property:value1,value2 One property, two values.
(b) property:"value1,value2" One property, one value.
(c) property:parameter=1,2:x One parameter, two values.
(d) property:parameter="1,2",3:y One parameter, one value.
(e) property:parameter=",":z One parameter, one value.
(f) property:x,y,z One property, three values
END:A-COMPONENT
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RFC 4324 Calendar Access Protocol December 2005
In this example:
'value1' IN property would match (a) only.
'value1,value2' IN property would match (b) only.
'value%' IN property would NOT match any.
',' IN property would NOT match any.
'%,%' IN property would NOT match any.
'x' IN property would match (f) and (c).
'2' IN parameter would match (c) only.
'1,2' IN parameter would match (d) only.
',' IN parameter would match (e) only.
'%,%' IN parameter would NOT match any.
property LIKE 'value1%' would match (a) and (b).
property LIKE 'value%' would match (a) and (b).
property LIKE 'x' would match (f) and (c).
parameter LIKE '1%' would match (c) and (d).
parameter LIKE '%2%' would match (c) and (d).
parameter LIKE ',' would match (e) only.
Some property values (such as the "RECUR" value type), contain commas
and are not multi-valued. The CS must understand the objects being
compared and understand how to determine how any multi-valued or
multi-instance properties or parameter values are separated, quoted,
and backslash-escaped and perform the comparisons as if each value
existed by itself and not quoted or backslash-escaped when comparing
using the IN element.
If the "IN" clause is preceded by 'NOT', then there is a match when
the value does not exist in the property or parameter value.
6.1.1.12. DATE-TIME and TIME Values in a WHERE Clause
All "DATE-TIME" and "TIME" literal values supplied in a "WHERE"
clause MUST be terminated with 'Z'. That means that the CUA MUST
supply the values in UTC.
Valid:
WHERE alarm.TRIGGER < '20020201T000000Z'
AND alarm.TRIGGER > '20020101T000000Z'
Not valid; it is a syntax error and the CS MUST reject the QUERY:
WHERE alarm.TRIGGER < '20020201T000000'
AND alarm.TRIGGER > '20020101T000000'
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6.1.1.13. Multiple Contained Components
If a query references a component and a component or property
contained in the component, any clauses referring to the contained
component or property must be evaluated on all of the contained
components or properties. If any of the contained components or
properties match the query, and the conditions on the containing
component are also true, the component matches the query.
For example, in the query below, if a BOOKED VEVENT contains multiple
VALARMs, and the VALARM.TRIGGER clause is true for any of the VALARMs
in the VEVENT, then the UID, SUMMARY, and DESCRIPTION of this VEVENT
would be included in the QUERY results.
BEGIN:VQUERY
EXPAND:TRUE
QUERY:SELECT UID,SUMMARY,DESCRIPTION FROM VEVENT
WHERE VALARM.TRIGGER >= '20000101T030405Z'
AND VALARM.TRIGGER <= '20001231T235959Z'
AND STATE() = 'BOOKED'
END:VQUERY
6.1.1.14. Example, Query by UID
The following example would match the entire content of a "VEVENT" or
"VTODO" component with the "UID" property equal to "uid123" , and it
would not expand any multiple instances of the component. If the CUA
does not know if "uid123" was a "VEVENT", "VTODO", "VJOURNAL", or
any other component, then all components that the CUA supports MUST
be supplied in a QUERY property. This example assumes the CUA is
only interested in "VTODO" and "VEVENT" components.
If the results were empty it could also mean that "uid123" was a
property in a component other than a VTODO or VEVENT.
BEGIN:VQUERY
QUERY:SELECT * FROM VTODO WHERE UID = 'uid123'
QUERY:SELECT * FROM VEVENT WHERE UID = 'uid123'
END:VQUERY
6.1.1.15. Query by Date-Time Range
This query selects the entire content of every booked "VEVENT"
component that has an instance greater than or equal to July 1,
2000 00:00:00 UTC and less than or equal to July 30, 2000 23:59:59
UTC. This includes single instance "VEVENT" components that do
not explicitly contain any recurrence properties or "RECURRENCE-
ID" properties. This works only for CSs that have the "RECUR-
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RFC 4324 Calendar Access Protocol December 2005
EXPAND" property value set to "TRUE" in the "GET-CAPABILITY"
exchange.
BEGIN:VQUERY
EXPAND:TRUE
QUERY:SELECT * FROM VEVENT
WHERE RECURRENCE-ID >= '20000701T000000Z'
AND RECURRENCE-ID <= '20000730T235959Z'
AND STATE() = 'BOOKED'
END:VQUERY
6.1.1.16. Query for All Unprocessed Entries
The following example selects the entire contents of all non-booked
"VTODO" and "VEVENT" components in the "UNPROCESSED" state. The
default for the "EXPAND" property is "FALSE", so the recurrence rules
will not be expanded.
BEGIN:VQUERY
QUERYID:Fetch VEVENT and VTODO iTIP components
QUERY:SELECT * FROM VEVENT WHERE STATE() = 'UNPROCESSED'
QUERY:SELECT * FROM VTODO WHERE STATE() = 'UNPROCESSED'
END:VQUERY
The following example fetches all "VEVENT" and "VTODO" components in
the "BOOKED" state.
BEGIN:VQUERY
QUERYID:Fetch All Booked VEVENT and VTODO components
QUERY:SELECT * FROM VEVENT WHERE STATE() = 'BOOKED'
QUERY:SELECT * FROM VTODO WHERE STATE() = 'BOOKED'
END:VQUERY
The following fetches the "UID" property for all "VEVENT" and "VTODO"
components that have been marked for delete.
BEGIN:VQUERY
QUERYID:Fetch UIDs of marked-for-delete VEVENTs and VTODOs
QUERY:SELECT UID FROM VEVENT WHERE STATE() = 'DELETED'
QUERY:SELECT UID FROM VTODO WHERE STATE() = 'DELETED'
END:VQUERY
6.1.1.17. Query with Subset of Properties by Date/Time
In this example, only the named properties will be selected, and all
booked and non-booked components have a "DTSTART" value from February
1st to February 10th 2000 (in UTC) will also be selected.
Royer, et al. Experimental PAGE 44
RFC 4324 Calendar Access Protocol December 2005
BEGIN:VQUERY
QUERY:SELECT UID,DTSTART,DESCRIPTION,SUMMARY FROM VEVENT
WHERE DTSTART >= '20000201T000000Z'
AND DTSTART <= '20000210T235959Z'
END:VQUERY
6.1.1.18. Query with Components and Alarms in A Range
This example fetches all booked "VEVENT" components with an alarm
that triggers within the specified time range. In this case only the
"UID", "SUMMARY", and "DESCRIPTION" properties will be selected for
all booked "VEVENTS" components that have an alarm between the two
date-times supplied.
BEGIN:VQUERY
EXPAND:TRUE
QUERY:SELECT UID,SUMMARY,DESCRIPTION FROM VEVENT
WHERE VALARM.TRIGGER >= '20000101T030405Z'
AND VALARM.TRIGGER <= '20001231T235959Z'
AND STATE() = 'BOOKED'
END:VQUERY
6.1.2. UPN Value Type
Value Name: UPN
Purpose: This value type is used to identify values that contain user
principal name of a CU or a group of CUs.
Formal Definition: The value type is defined by the following
notation:
;
upn = "@"
/ [ dot-atom-text ] "@" dot-atom-text
;
; dot-atom-text is defined in RFC 2822 [RFC 2822]
;
;
dot-atom-text = ; As defined in [iCAL].
Description: This data type is an identifier that denotes a CU or a
group of CU. A UPN is an RFC 2822-compliant email address
[RFC 2822], with exceptions listed below, and in most cases it is
deliverable to the CU. In some cases it is identical to the CU's
well known email address. A CU's UPN MUST never be an e-mail
address that is deliverable to a different person. And there is
no requirement that a person's UPN MUST be their e-mail address.
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A UPN is formatted as a user name followed by "@", followed by a
Realm in the form of a valid and unique DNS domain name. The user
name MUST be unique within the Realm. In its simplest form it
looks like "user@example.com".
In certain cases a UPN will not be RFC 2822-compliant. When
anonymous authentication is used, or anonymous authorization is
being defined, the special UPN "@" will be used. When
authentication MUST be used, but unique identity MUST be obscured,
a UPN of the form @DNS-domain-name may be used. For example,
"@example.com".
Example:
The following is a UPN for a CU:
jdoe@example.com
The following is an example of a UPN that could be for a group of
CU:
staff@example.com
The following is a UPN for an anonymous CU that belongs to a
specific realm. When used as a UPN-FILTER, it applies to all UPNs
in a specific realm:
@example.com
The following is a UPN for an anonymous CU:
@
6.1.3. UPN-FILTER Value
Value Name: UPN-FILTER
Purpose: This value type is used to identify values that contain a
user principal name filter.
Formal Definition: The value type is defined by the following
notation:
;
; NOTE: "CAL-OWNERS(cal-address)"
; and "NOT CAL-OWNERS(cal-address)"
; are both NOT allowed below.
;
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RFC 4324 Calendar Access Protocol December 2005
upn-filter = "CAL-OWNERS()" /
"NOT CAL-OWNERS()" /
"*" /
[ "*" / dot-atom-text ] "@" ( "*" / dot-atom-text )
;
; dot-atom-text is defined in RFC 2822
Description: The value is used to match user principal names (UPNs).
For "CAL-OWNERS()" and "NOT CAL-OWNERS()", see Section 8.24.
* Matches all UPNs.
@ Matches the UPN of anonymous CUs
belonging to the null realm
@* Matches the UPN of anonymous CUs
belonging to any non-null realm
@realm Matches the UPN of anonymous CUs
belonging to the specified realm.
*@* Matches the UPN of non-anonymous CUs
belonging to any non-null realm
*@realm Matches the UPN of non-anonymous CUs
belonging to the specified realm
user@realm Matches the UPN of the specified CU
belonging to the specified realm
user@* Not allowed.
user@ Not allowed.
Example: The following are examples of this value type:
DENY:NON CAL-OWNERS()
DENY:@hackers.example.com
DENY:*@hackers.example.com
GRANT:sam@example.com
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7. New Parameters
7.1. ACTION Parameter
Parameter Name: ACTION
Purpose: This parameter indicates the action to be taken when a
timeout occurs.
Value Type: TEXT
Conformance: This property can be specified in the "CMD" property.
When present in a "CMD" property, the "ACTION" parameter specifies
the action to be taken when the command timeout expires.
Formal Definition: The parameter is defined by the following
notation:
action-param = ";" "ACTION" "=" ( "ASK" / "ABORT" )
; If 'action-param' is supplied then
; 'latency-param' MUST be supplied.
Example:
CMD;LATENCY=10;ACTION=ASK:CREATE
7.2. ENABLE Parameter
Parameter Name: ENABLE
Purpose: This parameter indicates whether or not the property should
be ignored. For example, it can indicate that a "TRIGGER"
property in a "VALARM" component should be ignored.
Value Type: BOOLEAN
Conformance: This property can be specified in the "TRIGGER"
properties.
Description: When a non owner sends an [iTIP] "REQUEST" to a calendar
that object might contain a "VALARM" component. The owner may
wish to have local control over their own CUA and when or how
alarms are triggered.
A CUA may add the "ENABLE" parameter to any "TRIGGER" property
before booking the component. If the "ENABLE" parameter is set to
"FALSE", then the alarm will be ignored by the CUA. If set to
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"TRUE", or if the "ENABLE" property is not in the "TRIGGER"
property, the alarm is enabled. This parameter may not be known
by pre-CAP implementations, but this should not be an issue as it
conforms to an 'ianaparam' [iCAL].
Formal Definition: The property is defined by the following notation:
enable-param = "ENABLE" "=" boolean
;
boolean = ; As defined in [iCAL].
Example: The following is an example of this property for a "VAGENDA"
component:
TRIGGER;ENABLE=FALSE;RELATED=END:PT5M
7.3. ID Parameter
Parameter Name: ID
Purpose: When used in a "CMD" component, it provides a unique
identifier.
Value Type: TEXT
Conformance: This parameter can be specified in the "CMD" property.
Description: If more than one command is sent, then the "ID"
parameter is used to uniquely identify the command.
A CUA may add the "ID" parameter to any "CMD" property before
sending the command. There must not be more than one outstanding
command tagged with the same "ID" parameter value.
Formal Definition: The property is defined by the following notation:
id-param = ";" "ID" "=" unique-id
; The text value supplied is a unique value
; shared between the CUA and CS to uniquely
; identify the instance of command in the
; the current CUA session. The value has
; no meaning to other CUAs or other sessions.
;
unique-id = ; text
;
text = ; As defined in [iCAL].
Example: The following is an example of this parameter component:
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CMD;UD=some-unique-value:CREATE
7.4. LATENCY Parameter
Parameter Name: LATENCY
Purpose: This parameter indicates time in seconds for when a timeout
occurs.
Value Type: TEXT
Conformance: This property can be specified in the "CMD" property.
When present in a "CMD" property, the "LATENCY" parameter specifies
the time in seconds when the command timeout expires.
Formal Definition: The parameter is defined by the following
notation:
latency-param = ";" "LATENCY" "=" latency-sec
; The value supplied in the time in seconds.
; If 'latency-param' is supplied then
; 'action-param' MUST be supplied.
;
latency-sec = posint1
; Default is zero (0) meaning no timeout.
Example: The following is an example of this parameter:
CMD;LATENCY=10;ACTION=ASK:CREATE
7.5. LOCAL Parameter
Parameter Name: LOCAL
Purpose: Indicates if the named component should be exported to any
non-organizer calendar.
Value Type: BOOLEAN
Conformance: This parameter can be specified in the "SEQUENCE"
properties in a "VALARM" component.
Description: When a non-owner sends an [iTIP] "REQUEST" to a calendar
that object might contain a "VALARM" component. The owner may
wish to have local control over their own CUA and when or how
alarms are triggered.
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A CUA may add the "LOCAL" parameter to the "SEQUENCE" property
before booking the component. If the "LOCAL" parameter is set to
"TRUE", then the alarm MUST NOT be forwarded to any other
calendar. If set to "FALSE", or if the "LOCAL" parameter is not
in the "SEQUENCE" property, the alarm is global.
Formal Definition: The property is defined by the following notation:
local-param = "LOCAL" "=" boolean
Example: The following is an example of this parameter:
SEQUENCE;LOCAL=TRUE:4
7.6. LOCALIZE Parameter
Parameter Name: LOCALIZE
Purpose: If provided, specifies the desired language for error and
warning messages.
Value Type: TEXT
Conformance: This parameter can be specified in the "CMD" properties.
When the "LOCALIZE" parameter is supplied, its value MUST be one
of the values listed in the initial [BEEP] greeting 'localize'
attribute.
A CUA may add the "LOCALIZE" parameter to the "CMD" property to
specify the language of any error or warning messages.
Formal Definition: The property is defined by the following notation:
localize-param = ";" "LOCALIZE" "=" beep-localize
;
beep-localize = text ; As defined in [BEEP]
; The value supplied MUST be one value from
; the initial [BEEP] greeting 'localize'
; attribute, specifying the locale to use
; for error messages during
; this instance of the command.
Example: The following is an example of this parameter:
CMD;LOCALIZE=fr_CA:CREATE
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7.7. OPTIONS Parameter
Parameter Name: OPTIONS
Purpose: If provided the "OPTIONS" parameter specifies some "CMD"
property-specific options.
Value Type: TEXT
Conformance: This parameter can be specified in the "CMD" properties.
A CUA adds the "OPTIONS" parameter to the "CMD" property when the
command needs extra values.
Formal Definition: The property is defined by the following notation:
option-param = ";" "OPTIONS" "=" cmd-specific
;
cmd-specific = ; The value supplied is dependent on the
; CMD value. See the specific CMDs for the
; correct values to use for each CMD.
Example: The following is an example of this parameter:
CMD;OPTIONS=10:GENERATE-UID
8. New Properties
8.1. ALLOW-CONFLICT Property
Property Name: ALLOW-CONFLICT
Purpose: This property indicates whether or not the calendar and CS
supports component conflicts. That is, whether or not any of the
components in the calendar can overlap.
Value Type: BOOLEAN
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in "VAGENDA" and
"VCALSTORE" component.
Description: This property is used to indicate whether components may
conflict, that is, whether their expanded instances may share the
same time or overlap the same time periods. If it has a value of
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"TRUE", then conflicts are allowed. If "FALSE", the no two
components may conflict.
If "FALSE" in the "VCALSTORE" component, then all "VAGENDA"
component "ALLOW-CONFLICT" property values MUST be "FALSE" in the
CS.
Formal Definition: The property is defined by the following notation:
allow-conflict = "ALLOW-CONFLICT" other-params ":" boolean
CRLF
Example: The following is an example of this property for a "VAGENDA"
component:
ALLOW-CONFLICT:FALSE
8.2. ATT-COUNTER Property
Property Name: ATT-COUNTER
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property MUST be specified in an iCalendar object
that specifies a counter proposal to a group-scheduled calendar
entity. When storing a "METHOD" property with the "COUNTER"
method, there needs to be a way to remember who sent the COUNTER.
The ATT-COUNTER property MUST be added to all "COUNTER" [iTIP]
components by the CUA before storing in a CS.
Description: This property is used to identify the CAL-ADDRESS of the
entity that sent the "COUNTER" [iTIP] object.
Formal Definition: The property is defined by the following notation:
attcounter = "ATT-COUNTER" other-params ":" cal-address CRLF
Examples:
ATT-COUNTER:cap:example.com/Doug
ATT-COUNTER:mailto:Doug@Example.com
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8.3. CALID Property
Property Name: CALID
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in the "VAGENDA"
component.
Description: This property is used to specify a fully-qualified
CALID.
Formal Definition: The property is defined by the following notation:
calid = "CALID" other-params ":" relcalid CRLF
Example:
CALID:cap://cal.example.com/sdfifgty4321
8.4. CALMASTER Property
Property Name: CALMASTER
Purpose: The property specifies an e-mail address of a person
responsible for the calendar store.
Value Type: URI
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: The property can be specified in a "VCALSTORE"
component.
Description: The parameter value SHOULD be a MAILTO URI as defined in
[URL]. It MUST be a contact URI such as a MAILTO URI and not a home
page or file URI that describes how to contact the calmasters.
Formal Definition: The property is defined by the following notation:
calmaster = "CALMASTER" other-params ":" uri CRLF
;
uri = ; IANA registered uri as defined in [iCAL].
Example: The following is an example of this property:
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CALMASTER:mailto:administrator@example.com
8.5. CAP-VERSION Property
Property Name: CAP-VERSION
Purpose: This property specifies the version of CAP supported.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property is specified in the "VREPLY" component
that is sent in response to a "GET-CAPABILITY" command.
Description: This specifies the version of CAP that the endpoint
supports. The list is a comma-separated list of supported RFC
numbers. The list MUST contain at least 4324.
Formal Definition: The property is defined by the following notation:
cap-version = "CAP-VERSION" other-params ":" text CRLF
Example: The following are examples of this property:
CAP-VERSION:4324
8.6. CARID Property
Property Name: CARID
Purpose: This property specifies the identifier for an access right
component.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property MUST be specified once in a "VCAR"
component.
Description: This property is used in the "VCAR" component to specify
an identifier. A "CARID" property value is unique per container.
Formal Definition: The property is defined by the following notation:
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carid = "CARID" other-params ":" text CRLF
Example: The following are examples of this property:
CARID:xyzzy-007
CARID:User Rights
8.7. CAR-LEVEL Property
Property Name: CAR-LEVEL
Purpose: The property specifies the level of VCAR supported.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: The property can be specified in a "VREPLY" component
that is sent in response to a "GET-CAPABILITY" command.
Description: The value is one from a list of "CAR-NONE", "CAR-MIN",
or "CAR-FULL-1". If "CAR-FULL-1" is supplied, then "CAR-MIN" is
also available. A "CAR-MIN" implementation only supported the
"DEFAULT-VCARS" property values listed in the "VCALSTORE"
component, and a "CAR-MIN" implementation does not support the
creation or modification of "VCAR" components from the CUA.
Formal Definition: The property is defined by the following notation:
car-level = "CAR-LEVEL" ":" other-params ":"
car-level-values
car-level-values = ( "CAR-NONE" / "CAR-MIN" / "CAR-FULL-1"
/ other-levels )
other-levels = ; Any name published in an RFC for a
; "CAR-LEVEL" property value.
Example: The following is an example of this property:
CAR-LEVEL:CAR-FULL-1
8.8. COMPONENTS Property
Property Name: COMPONENTS
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Purpose: The property specifies a the list of components supported by
the endpoint.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: The property can be specified in a "VREPLY" component in
response to a "GET-CAPABILITY" command.
Description: A comma-separated list of components that are supported
by the endpoint. A component that is not in the list sent from
the endpoint is not supported by that endpoint. Sending an
unsupported component results in unpredictable results. This
includes any components inside of other components (VALARM for
example). The recommended list is
"VCALSTORE,VCALENDAR,VREPLY,VAGENDA,
VEVENT,VALARM,VTIMEZONE,VJOURNAL,VTODO,VALARM,
DAYLIGHT,STANDARD,VCAR,VRIGHT,VQUERY".
Formal Definition: The property is defined by the following notation:
components = "COMPONENTS" other-params ":" comp-list CRLF
;
; All of these MUST be supplied only once.
;
comp-list-req = "VCALSTORE" "," "VCALENDAR" "," "VTIMEZONE" ","
"VREPLY" "," "VAGENDA" "," "STANDARD" ","
"DAYLIGHT"
; At least one MUST be supplied. The same value
; MUST NOT occur more than once.
;
comp-list-min = ( "," "VEVENT")
/ ( "," "VTODO")
/ ( "," "VJOURNAL" )
; The same value MUST NOT occur
; more than once. If "VCAR" is supplied then
; "VRIGHT" must be supplied.
;
comp-list-opt = ( "," "VFREEBUSY" ) / ( "," "VALARM" )
/ ( "," "VCAR" ) / ( "," "VRIGHT" )
/ ( "," "VQUERY") / ( "," x-comp )
/ ( "," iana-comp )
;
comp-list = comp-list-req 1*3comp-list-min *(comp-list-opt)
Example: The following is an example of this property:
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COMPONENTS:VCALSTORE,VCALENDAR,VREPLY,VAGENDA,
VEVENT,VALARM,VTIMEZONE,VJOURNAL,VTODO,
DAYLIGHT,STANDARD,VFREEBUSY,VCAR,VRIGHT,VQUERY
8.9. CSID Property
Property Name: CSID
Purpose: The property specifies a globally unique identifier for the
calendar store.
Value Type: URI
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: The property can be specified in a "VCALSTORE"
component.
Description: The identifier MUST be globally unique. Each CS needs
its own unique identifier. The "CSID" property is the official
unique identifier for the CS. If the BEEP 'serverName' attribute
was supplied in the BEEP 'start' message, then the CSID will be
mapped to the virtual host name supplied, and the host name part
of the CSID MUST be the same as the 'serverName' value. This
allows one CS implementation to service multiple virtual hosts.
CS's are not required to support virtual hosting. If a CS does
not support virtual hosting, then it must ignore the BEEP
'serverName' attribute.
Formal Definition: The property is defined by the following notation:
csid = "CSID" other-params ":" capurl CRLF
Example: The following is an example of this property:
CSID:cap://calendar.example.com
8.10. DECREED Property
Property Name: DECREED
Purpose: This property specifies if an access right calendar
component is decreed or not.
Value Type: BOOLEAN
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Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property MAY be specified once in a "VCAR"
component.
Description: This property is used in the "VCAR" component to specify
whether the component is decreed or not. If the "DECREED"
property value is "TRUE" then the CUA will be unable to change the
contents of the "VCAR" component and any attempt will fail with an
error.
Formal Definition: The property is defined by the following notation:
decreed = "DECREED" other-params ":" boolean CRLF
Example: The following is an example of this property:
DECREED:TRUE
8.11. DEFAULT-CHARSET Property
Property Name: DEFAULT-CHARSET
Purpose: This property indicates the default charset.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in "VAGENDA" and
"VCALSTORE" calendar component.
Description: In a "VAGENDA" component this property is used to
indicate the charset of calendar. If not specified, the default
is the first value in the "VCALSTORE" components "DEFAULT-CHARSET"
property value list. The value MUST be an IANA registered
character set as defined in [CHARREG].
In a "VCALSTORE" component it is a comma-separated list of charsets
supported by the CS. The first entry is the default entry for all
newly created "VAGENDA" components. The "UTF-8" value MUST be in
the "VCALSTORE" component "DEFAULT-CHARSET" property list. All
compliant
CAP implementations (CS and CUA) MUST support at least the "UTF-8"
charset.
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If a charset name contains a comma (,), that comma must be
backslash-escaped in the value.
Formal Definition: The property is defined by the following notation:
default-charset = "DEFAULT-CHARSET" other-params ":" text
*( "," text) CRLF
Example: The following is an example of this property for a "VAGENDA"
component:
DEFAULT-CHARSET:Shift_JIS,UTF-8
8.12. DEFAULT-LOCALE Property
Property Name: DEFAULT-LOCALE
Purpose: This property specifies the default language for text
values.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in "VAGENDA" and
"VCALSTORE" components.
Description: In a "VAGENDA" component, the "DEFAULT-LOCALE" property
is used to indicate the locale of the calendar. The full locale
SHOULD be used. The default and minimum locale is POSIX (aka the
'C' locale).
In a "VCALSTORE" component, it is a comma-separated list of
locales supported by the CS. The first value in the list is the
default for all newly created VAGENDAs. "POSIX" MUST be in the
list.
Formal Definition: The property is defined by the following notation:
default-locale = "DEFAULT-LOCALE" other-params ":" language
*( "," language) CRLF
;
language = ; Text identifying a locale, as defined in [CHARPOL]
Example: The following is an example of this property:
DEFAULT-LOCALE:en-US.iso-8859-1,POSIX
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8.13. DEFAULT-TZID Property
Property Name: DEFAULT-TZID
Purpose: This property specifies the text value that specifies the
time zones.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property may be specified once in a "VAGENDA" and
"VCALSTORE" components.
Description: A multi-valued property that lists the known time zones.
The first is the default. Here "TZID" property values are the
same as the "TZID" property defined in [iCAL].
If used in a "VCALSTORE" component, it is a comma-separated list
of TZIDs known to the CS. The entry is used as the default TZID
list for all newly created calendars. The list MUST contain at
least "UTC". A "VCALSTORE" components MUST contain one
"VTIMEZONE" component for each value in the "DEFAULT-TZID"
property value.
If used in a "VAGENDA" component, it is a comma-separated list of
"TZID" property values naming the time zones known to the
calendar. The first time zone in the list is the default and is
used as the localtime for objects that contain a date or date-time
value without a time zone. All "VAGENDA" components MUST have one
"VTIMEZONE" component contained for each value in the "DEFAULT-
TZID" property value.
If a "TZID" property value contains a comma (,), the comma must be
backslash-escaped.
Formal Definition: This property is defined by the following
notation:
default-tzid = "DEFAULT-TZID" other-params
":" [tzidprefix] text
*("," [tzidprefix] text) CRLF
;
txidprefix = ; As defined in [iCAL].
Example: The following is an example of this property:
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DEFAULT-TZID:US/Mountain,UTC
8.14. DEFAULT-VCARS Property
Property Name: DEFAULT-VCARS
Purpose: This property is used to specify the "CARID" property ids of
the default "VCAR" components for newly created "VAGENDA"
components.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property MUST be specified in "VCALSTORE" calendar
component and MUST at least specify the following values:
"READBUSYTIMEINFO", "REQUESTONLY", "UPDATEPARTSTATUS", and
"DEFAULTOWNER".
Description: This property is used in the "VCALSTORE" component to
specify the "CARID" value of the "VCAR" components that MUST be
copied into now "VAGENDA" components at creation time by the CS.
All "DEFAULT-VCAR" values must have "VCARS" components stored in
the "VCALSTORE".
Formal Definition: The property is defined by the following notation:
defautl-vcars = "DEFAULT-VCARS" other-params ":" text
*( "," text ) CRLF
Example: The following is an example of this property:
DEFAULT-VCARS:READBUSYTIMEINFO,REQUESTONLY,
UPDATEPARTSTATUS,DEFAULTOWNER
8.15. DENY Property
Property Name: DENY
Purpose: This property identifies the UPN(s) being denied access in
the "VRIGHT" component.
Value Type: UPN-FILTER
Property Parameters: Non-standard property parameters can be
specified on this property.
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Conformance: This property can be specified in "VRIGHT" components.
Description: This property is used in the "VRIGHT" component to
define the CU or UG being denied access.
Formal Definition: The property is defined by the following notation:
deny = "DENY" other-params ":" upn-filter CRLF
Example: The following are examples of this property:
DENY:*
DENY:bob@example.com
8.16. EXPAND property
Property Name: EXPAND
Purpose: This property is used to notify the CS whether to expand any
component with recurrence rules into multiple instances, in a
query reply.
Value Type: BOOLEAN
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in "VQUERY" components.
Description: If a CUA wishes to see all of the instances of a
recurring component, the CUA sets EXPAND=TRUE in the "VQUERY"
component. If not specified, the default is "FALSE". Note that
if the CS has its "RECUR-EXPAND" CS property value set to "FALSE",
then the "EXPAND" property will be ignored and the result will be
as if the "EXPAND" value was set to "FALSE". The results will be
bounded by any date range or other limits in the query.
Formal Definition: The property is defined by the following notation:
expand = "EXPAND" other-params ":" ("TRUE" / "FALSE") CRLF
Example: The following are examples of this property:
EXPAND:FALSE
EXPAND:TRUE
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8.17. GRANT Property
Property Name: GRANT
Purpose: This property identifies the UPN(s) being granted access in
the "VRIGHT" component.
Value Type: UPN-FILTER
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in "VRIGHT" calendar
components.
Description: This property is used in the "VRIGHT" component to
specify the CU or UG being granted access.
Formal Definition: The property is defined by the following notation:
grant = "GRANT" other-params ":" upn-filter CRLF
Example: The following are examples of this property:
GRANT:*
GRANT:bob@example.com
8.18. ITIP-VERSION Property
Property Name: ITIP-VERSION
Purpose: This property specifies the version of ITIP supported.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property is specified in the "VREPLY" component
that is sent in response to a "GET-CAPABILITY" command.
Description: This specifies the version of ITIP that the endpoint
supports. The list is a comma-separated list of supported RFC
numbers. The list MUST contain at least 2446, which is [iTIP]
Formal Definition: The property is defined by the following notation:
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itip-version = "ITIP-VERSION" other-params ":" text CRLF
Example: The following are examples of this property:
ITIP-VERSION:2446
8.19. MAX-COMP-SIZE Property
Property Name: MAX-COMP-SIZE
Purpose: This property specifies the largest size of any object
accepted.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property is specified in the "VREPLY" component
that is sent in response to a "GET-CAPABILITY" command.
Description: A positive integer value that specifies the size of the
largest iCalendar object that can be accepted in octets. Objects
larger than this will be rejected. A value of zero (0) means no
limit. This is also the maximum value of any [BEEP] payload that
will be accepted or sent.
Formal Definition: The property is defined by the following notation:
max-comp-size = "MAX-COMP-SIZE" other-params ":" posint0 CRLF
Example: The following are examples of this property:
MAX-COMP-SIZE:1024
8.20. MAXDATE Property
Property Name: MAXDATE
Purpose: This property specifies the date/time in the future, beyond
which the CS or CUA cannot represent.
Value Type: DATE-TIME
Property Parameters: Non-standard property parameters can be
specified on this property.
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Conformance: The property can be specified in the "VCALSTORE"
component.
Description: The date and time MUST be a UTC value and end with 'Z'.
Formal Definition: The property is defined by the following notation:
maxdate = "MAXDATE" other-params ":" date-time CRLF
Example: The following is an example of this property:
MAXDATE:20990101T000000Z
8.21. MINDATE Property
Property Name: MINDATE
Purpose: This property specifies the date/time in the past, prior to
which the server cannot represent.
Value Type: DATE-TIME
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: The property can be specified in the "VCALSTORE"
component.
Description: The date and time MUST be a UTC value and end with 'Z'.
Formal Definition: The property is defined by the following notation:
mindate = "MINDATE" other-params ":" date-time CRLF
date-time = ; As defined in [iCAL].
Example: The following is an example of this property:
MINDATE:19710101T000000Z
8.22. MULTIPART Property
Property Name: MULTIPART
Purpose: This property provides a comma-separated list of supported
MIME multipart types supported by the sender.
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Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property is specified in the "VREPLY" component
that is sent in response to a "GET-CAPABILITY" command.
Description: This property is used in the in the "GET-CAPABILITY"
command reply to indicate the MIME multipart types supported. A
CS and CUA SHOULD support all registered MIME multipart types.
Formal Definition: The property is defined by the following notation:
multipart = "MULTIPART" other-params ":" text *( "," text) CRLF
Example: The following is an example of this property:
MULTIPART:related,alternate,mixed
8.23. NAME Property
Property Name: NAME
Purpose: This property provides a localizable display name for a
component.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in a component.
Description: This property is used in the component to specify a
localizable display name. If more than one "NAME" properties are
in a component, then they MUST have unique "LANG" parameters. If
the "LANG" parameter is not supplied, then it defaults to the
"VAGENDA" component's "DEFAULT-LOCALE" first value. If the
component is a "VAGENDA", then the default value is the "VAGENDA"s
component's "DEFAULT-LOCALE" first value. A "VCALSTORE"
component's "DEFAULT-LOCALE" first value is the default if the
component is stored at the "VCALSTORE" level.
Formal Definition: The property is defined by the following notation:
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name = "NAME" nameparam ":" text CRLF
;
nameparam = other-params [ ";" languageparam ] other-params
;
languageparam = ; As defined in [iCAL].
Example: The following is an example of this property:
NAME:Restrict Guests From Creating VALARMs On VEVENTs
8.24. OWNER Property
Property Name: OWNER
Purpose: The property specifies an owner of the component.
Value Type: UPN
Property Parameters: Non-standard, alternate text representation and
language property parameters can be specified on this property.
Conformance: The property MUST be specified in a "VAGENDA" component.
Description: A multi-instanced property indicating the calendar
owner.
Formal Definition: The property is defined by the following notation:
owner = "OWNER" other-params ":" upn CRLF
Example: The following is an example of this property:
OWNER:jsmith@example.com
OWNER:jdough@example.com
8.25. PERMISSION Property
Property Name: PERMISSION
Purpose: This property defines a permission that is granted or denied
in a "VRIGHT" component.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in "VRIGHT" components.
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Description: This property is used in the "VRIGHT" component to
define a permission that is granted or denied.
Formal Definition: The property is defined by the following notation:
permission = "PERMISSION" other-params ":" permvalue CRLF
;
permvalue = ( "SEARCH" / "CREATE" / "DELETE"
/ "MODIFY" / "MOVE" / all
/ iana-cmd / x-cmd )
;
all = "*"
;
iana-cmd = ; Any command registered by IANA directly or
; included in an RFC that may be applied as
; a command.
;
x-cmd = ; Any experimental command that starts with
; "x-" or "X-".
Example: The following is an example of this property:
PERMISSION:SEARCH
8.26. QUERY property
Property Name: QUERY
Purpose: Specifies the query for the component.
Value Type: CAL-QUERY
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in "VQUERY" components.
Description: A "QUERY" is used to specify the "CAL-QUERY" (Section
6.1.1 for the query.
Formal Definition: The property is defined by the following notation:
query = "QUERY" other-params ":" cal-query CRLF
Example: The following is an example of this property:
QUERY:SELECT * FROM VEVENT
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8.27. QUERYID property
Property Name: QUERYID
Purpose: Specifies a unique ID for a query in the targeted container.
Value Type: TEXT
Property Parameters: Non-standard property parameters are specified
on this property.
Conformance: This property can be specified in "VQUERY" components.
Description: A "QUERYID" property is used to specify the unique id
for a query. A "QUERYID" property value is unique per container.
Formal Definition: The property is defined by the following notation:
queryid = "QUERYID" other-params ":" text CRLF
Example: The following are examples of this property:
QUERYID:Any Text String
QUERYID:fetchUnProcessed
8.28. QUERY-LEVEL Property
Property Name: QUERY-LEVEL
Purpose: This property specifies the level of query supported.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: The property can be specified in the "VREPLY" component
in response to a "GET-CAPABILITY" command.
Description: Indicates level of query support. CAL-QL-NONE is for
CS's that allow ITIP methods only to be deposited and nothing
else.
Formal Definition: The property is defined by the following notation:
query-level = "QUERY-LEVEL" other-params
":" ( "CAL-QL-1" / "CAL-QL-NONE") CRLF
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Example: The following is an example of this property:
QUERY-LEVEL:CAL-QL-1
8.29. RECUR-ACCEPTED Property
Property Name: RECUR-ACCEPTED
Purpose: This property specifies if the endpoint supports recurring
instances.
Value Type: BOOLEAN
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: The property can be specified in the "VREPLY" component
in response to a "GET-CAPABILITY" command.
Description: Indicates if recurrence rules are supported. If "FALSE"
then the endpoint cannot process any kind of recurring rules.
Formal Definition: The property is defined by the following notation:
recur-accepted = "RECUR-ACCEPTED" other-params ":" boolean CRLF
Example: The following is an example of this property:
RECUR-ACCEPTED:TRUE
RECUR-ACCEPTED:FALSE
8.30. RECUR-LIMIT Property
Property Name: RECUR-LIMIT
Purpose: This property specifies the maximum number of instances the
endpoint will expand instances at query or storage time.
Value Type: INTEGER
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: The property can be specified in the "VREPLY" component
in response to a "GET-CAPABILITY" command.
Description: For implementations that have the "STORES-EXPANDED"
value set to "TRUE", this value specifies the maximum number of
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instances that will be stored and fetched. For all
implementations, this is the maximum number of instances that will
be returned when the "EXPAND" parameter is specified as "TRUE" and
the results contain an infinite or large number of recurring
instances.
Formal Definition: The property is defined by the following notation:
recur-limit = "RECUR-LIMIT" other-params ":" posint1 CRLF
Example: The following is an example of this property:
RECUR-LIMIT:1000
8.31. RECUR-EXPAND Property
Property Name: RECUR-EXPAND
Purpose: This property specifies if the endpoint can expand
recurrences into multiple objects.
Value Type: BOOLEAN
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: The property can be specified in the "VREPLY" component
in response to a "GET-CAPABILITY" command.
Description: If "TRUE", then the endpoint can expand an object into
multiple instances as defined by its recurrence rules when the
"EXPAND" property is supplied. If "FALSE", then the endpoint
ignores the "EXPAND" property.
Formal Definition: The property is defined by the following notation:
recur-expand = "RECUR-EXPAND" other-params ":" boolean CRLF
Example: The following is an example of this property:
RECUR-EXPAND:TRUE
RECUR-EXPAND:FALSE
8.32. RESTRICTION Property
Property Name: RESTRICTION
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Purpose: This property defines restrictions on the result value of
new or existing components.
Value Type: CAL-QUERY
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in "VRIGHT" components,
but only when the "PERMISSION" property is set to "CREATE",
"MODIFY", or "*" property value.
Description: This property is used in the "VRIGHT" component to
define restrictions on the components that can be written (i.e.,
by using the "CREATE" or "MOVE" commands) as well as on the values
that may take existent calendar store properties, calendar
properties, components, and properties (i.e., by using the
"MODIFY" command). Accepted values MUST match any specified
"RESTRICTION" property values.
Formal Definition: The property is defined by the following notation:
restriction = "RESTRICTION" other-params ":" cal-query CRLF
Example: The following are examples of this property:
RESTRICTION:SELECT * FROM VCALENDAR WHERE METHOD = 'REQUEST'
RESTRICTION:SELECT * FROM VEVENT WHERE
SELF() IN ORGANIZER
RESTRICTION:SELECT * FROM VEVENT WHERE 'BUSINESS' IN
CATEGORIES
8.33. SCOPE Property
Property Name: SCOPE
Purpose: This property identifies the objects in the CS to which the
access rights apply.
Value Type: CAL-QUERY
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in "VRIGHT" components.
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Description: This property is used in the "VRIGHT" component to
define the set of objects, subject to the access right being
defined.
Formal Definition: The property is defined by the following notation:
scope = "SCOPE" other-params ":" cal-query CRLF
Example: The following is an example of this property:
SCOPE:SELECT DTSTART,DTEND FROM VEVENT WHERE CLASS = 'PUBLIC'
8.34. STORES-EXPANDED Property
Property Name: STORES-EXPANDED
Purpose: This property specifies if the sending endpoint expands
recurrence rules prior to storing them into the CS.
Value Type: BOOLEAN
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in a "VREPLY" component
in response to a "GET-CAPABILITY" command.
Description: If the value is "TRUE", then the endpoint expands
recurrence rules and stores the results into the CS. If this is
"TRUE", then the "RECUR-LIMIT" property is significant because an
infinitely-recurring appointment will store no more than "RECUR-
LIMIT" property values into the CS and all other instances will be
lost.
Formal Definition: The property is specified by the following
notation:
stores-expanded = "STORES-EXPANDED" other-params ":" boolean
CRLF
The following is an example of this property:
STORES-EXPANDED:TRUE
STORES-EXPANDED:FALSE
8.35. TARGET Property
Property Name: TARGET
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Purpose: This property defines the container that the issued command
will act upon. Its value is a capurl, as defined in Section 5.
Value Type: URI
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in a command component.
Description: This property value is used to specify the container
that the command will effect. When used in a command, the command
will be performed on the container that has a capurl matching the
value.
Formal Definition: The property is specified by the following
notation:
target = "TARGET" other-params ":" ( capurl / relcalid ) CRLF
Example: The following is an example of this property:
TARGET:cap://mycal.example.com
TARGET:SomeRelCalid
8.36. TRANSP Property
Property Name: TRANSP
Purpose: This property defines whether a component is transparent or
not to busy-time searches. This is a modification to [iCAL]
"TRANSP" property, in that it adds some values.
Value Type: TEXT
Property Parameters: Non-standard property parameters can be
specified on this property.
Conformance: This property can be specified in a component.
Description: Time Transparency is the characteristic of an object
that determines whether it appears to consume time on a calendar.
Objects that consume actual time for the individual or resource
associated with the calendar SHOULD be recorded as "OPAQUE",
allowing them to be detected by free-busy time searches. Other
objects, which do not take up the individual's (or resource's)
time SHOULD be recorded as "TRANSPARENT", making them invisible to
free/busy time searches.
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Formal Definition: The property is specified by the following
notation:
transp = "TRANSP" other-params ":" transvalue CRLF
;
transvalue = "OPAQUE" ;Blocks or opaque on busy time searches.
/ "TRANSPARENT"
; Transparent on busy time searches.
/ "TRANSPARENT-NOCONFLICT"
; Transparent on busy time searches,
; and no other OPAQUE or OPAQUE-
; NOCONFLICT objects can overlap it.
;
/ "OPAQUE-NOCONFLICT"
; Opaque on busy time searches, and
; no other OPAQUE or OPAQUE-NOCONFLICT
; objects can overlap it.
;
; Default value is OPAQUE
The following is an example of this property for an object that is
opaque or blocks on free/busy time searches, and no other object
can overlap it:
TRANSP:OPAQUE-NOCONFLICT
9. New Components
9.1. VAGENDA Component
Component Name: VAGENDA
Purpose: Provide a grouping of properties that defines an agenda.
Formal Definition: There are two formats of the "VAGENDA" component.
(1) When it is being created, and (2) how it exists in the
"VCALSTORE" component.
A "VAGENDA" component in a "VCALSTORE" component is defined by the
following notes and ABNF notation:
CALSCALE - The value MUST be from the "VCALSTORE" "CALSCALE"
property list. The default is the first entry in the
VCALSTORE CALSCALE list.
CREATED - The timestamp of the calendar's create date. This
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is a READ ONLY property in a "VAGENDA".
LAST-MODIFIED - The timestamp of any change to the "VAGENDA"
properties or when any component was last created, modified,
or deleted.
agenda = "BEGIN" ":" "VAGENDA" CRLF
agendaprop
*(icalobject) ; as defined in [iCAL]
"END" ":" "VAGENDA" CRLF
agendaprop = *(
; The following MUST occur exactly once.
;
allow-conflict / relcalid / calscale / created
/ default-charset / default-locale
/ default-tzid / last-mod
;
; The following MUST occur at least once.
; and the value MUST NOT be empty.
;
/ owner
;
; The following are optional,
; and MAY occur more than once.
;
/ name / related-to / other-props / x-comp
)
icalobject = ; As defined in [iCAL].
;
created = ; As defined in [iCAL].
;
related-to = ; As defined in [iCAL].
When creating a VAGENDA, use the following notation:
agendac = "BEGIN" ":" "VAGENDA" CRLF
agendacprop
*(icalobject) ; as defined in [iCAL].
"END" ":" "VAGENDA" CRLF
agendacprop = *(
; The following MUST occur exactly once.
;
allow-conflict / relcalid / calscale
/ default-charset / default-locale
/ default-tzid
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;
; The following MUST occur at least once.
; and the value MUST NOT be empty.
;
/ owner
;
; The following are optional,
; and MAY occur more than once.
;
/ name / related-to / other-props / x-comp
)
To fetch all of the properties from the targeted "VAGENDA" component
but do not fetch any components, use:
SELECT * FROM VAGENDA
To fetch all of the properties from the targeted VAGENDA and all of
the contained components, use the special '*.*' value:
SELECT *.* FROM VAGENDA
9.2. VCALSTORE Component
Component Name: VCALSTORE
Purpose: Provide a grouping of properties that defines a calendar
store.
Formal Definition: A "VCALSTORE" component is defined by the
following table and ABNF notation. The creation of a "VCALSTORE"
component is an administrative task and not part of the CAP
protocol.
The following are notes to some of the properties in the
"VCALSTORE" component.
CALSCALE - A comma-separated list of CALSCALEs supported by
this CS. All "VAGENDA" component calendar CALSCALE
properties MUST be from this list. This list MUST contain
at least "GREGORIAN". The default for newly created
"VAGENDA" components is the first entry.
RELATED-TO - This is a multiple-instance property. There MUST
be a "RELATED-TO" property for each of the "VAGENDA"
components contained in the "VCALSTORE" component, each with
the "RELTYPE" parameter value set to "CHILD". Other
"RELATED-TO" properties may be included.
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CREATED - The timestamp of the CS creation time. This is a
READ ONLY property.
CSID - The CSID of this calendar store. This MUST NOT be
empty. How this property is set in the VCALSTORE is an
administrative or implementation-specific issue and is not
covered in CAP. This is a READ ONLY property. A suggested
value is the fully-qualified host name or a fully-qualified
virtual host name supported by the system.
LAST-MODIFIED - The timestamp when the Properties of the
"VCALSTORE" component were last updated or calendars were
created or deleted. This is a READ ONLY PROPERTY.
calstorec = "BEGIN" ":" "VCALSTORE" CRLF
calstoreprop
*(vagendac)
"END" ":" "VCALSTORE" CRLF
;
calstoreprop = *(
; the following MUST occur exactly once
;
allow-conflict / calscale / calmaster
/ created / csid / default-charset
/ default-locale / default-vcars
/ default-tzid / last-mod / maxdate / mindate
;
; the following are optional,
; and MAY occur more than once
;
/ name / related-to / other-props / x-comp
)
;
vagendac = ; As defined in [iCAL].
;
last-mod = ; As defined in [iCAL].
To fetch all of the properties from the targeted VCALSTORE and not
fetch the calendars that it contains, use:
SELECT * FROM VCALSTORE
To fetch all of the properties from the targeted "VCALSTORE"
component and all of the contained calendars and all of those
calendars' contained properties and components, use the special '*.*'
value:
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SELECT *.* FROM VCALSTORE
9.3. VCAR Component
Component Name: VCAR
Purpose: Provide a grouping of calendar access rights.
Formal Definition: A "VCAR" component is defined by the following
notation:
carc = "BEGIN" ":" "VCAR" CRLF
carprop 1*rightc
"END" ":" "VCAR" CRLF
;
carprop = 1*(
;
; 'carid' is REQUIRED,
; but MUST NOT occur more than once
;
carid /
;
; the following are OPTIONAL,
; and MAY occur more than once
;
name / decreed / other-props
)
Description: A "VCAR" component is a grouping of properties, and
"VRIGHT" components, that represents access rights granted or
denied to UPNs.
The "CARID" property specifies the local identifier for the "VCAR"
component. The "NAME" property specifies a localizable display
name.
Example: In the following example, the UPN "foo@example.com" is given
search access to the "DTSTART" and "DTEND" VEVENT properties. No
other access is specified:
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BEGIN:VCAR
CARID:View Start and End Times
NAME:View Start and End Times
BEGIN:VRIGHT
GRANT:foo@example.com
PERMISSION:SEARCH
SCOPE:SELECT DTSTART,DTEND FROM VEVENT
END:VRIGHT
END:VCAR
In this example, all UPNs are given search access to "DTSTART" and
"DTEND" properties of VEVENT components. "All CUs and UGs" are
specified by the UPN value "*". Note that this enumerated UPN
value is not in quotes:
BEGIN:VCAR
CARID:ViewStartEnd2
NAME:View Start and End Times 2
BEGIN:VRIGHT
GRANT:*
PERMISSION:SEARCH
SCOPE:SELECT DTSTART,DTEND FROM VEVENT
END:VRIGHT
END:VCAR
In these examples, full calendar access rights are given to the
CAL-OWNERS(), and a hypothetical administrator is given access
rights to specify calendar access rights. If no other rights are
specified, only these two UPNs can specify calendar access rights:
BEGIN:VCAR
CARID:some-id-3
NAME:Only OWNER or ADMIN Settable VCARs
BEGIN:VRIGHT
GRANT:CAL-OWNERS()
PERMISSION:*
SCOPE:SELECT * FROM VAGENDA
END:VRIGHT
BEGIN:VRIGHT
GRANT:cal-admin@example.com
PERMISSION:*
SCOPE:SELECT * FROM VCAR
RESTRICTION:SELECT * FROM VCAR
END:VRIGHT
END:VCAR
In this example, rights to write, search, modify or delete
calendar access are denied to all UPNs. This example would
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disable providing different access rights to the calendar store or
calendar. This calendar access right should be specified with
great care, as it removes the ability to change calendar access;
even for the owner or administrator. It could be used by small
devices that do not support changing any VCAR:
BEGIN:VCAR
CARID:VeryRestrictiveVCAR-2
NAME:No CAR At All
BEGIN:VRIGHT
DENY:*
PERMISSION:*
SCOPE:SELECT * FROM VCAR
END:VRIGHT
END:VCAR
9.4. VRIGHT Component
Component Name: "VRIGHT"
Purpose: Provide a grouping of properties that describe an access
right (granted or denied).
Formal Definition: A "VRIGHT" component is defined by the following
notation:
rightc = "BEGIN" ":" "VRIGHT" CRLF
rightprop
"END" ":" "VRIGHT" CRLF
;
rightprop = 2*(
;
; either 'grant' or 'deny' MUST
; occur at least once
; and MAY occur more than once
;
grant / deny /
;
; 'permission' MUST occur at least once
; and MAY occur more than once
;
permission /
;
; the following are optional,
; and MAY occur more than once
;
scope / restriction / other-props
)
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Description: A "VRIGHT" component is a grouping of calendar access
right properties.
The "GRANT" property specifies the UPN that is being granted
access. The "DENY" property specifies the UPN that is being
denied access. The "PERMISSION" property specifies the actual
permission being set. The "SCOPE" property identifies the
calendar store properties, calendar properties, components, or
properties to which the access right applies. The "RESTRICTION"
property specifies restrictions on commands and results. If the
command does not match the restrictions, or if the results of the
command do not match the restrictions, then it is an access
violation.
9.5. VREPLY Component
Component Name: "VREPLY"
Purpose: Provide a grouping of arbitrary properties and components
that are the data set result from an issued command.
Formal Definition: A "VREPLY" component is defined by the following
notation:
replyc = "BEGIN" ":" "VREPLY" CRLF
any-prop-or-comp
"END" ":" "VREPLY" CRLF
;
any-prop-or-comp = ; Zero or more iana or experimental
; properties and components, in any order.
Description: Provide a grouping of arbitrary properties and
components that are the data set result from an issued command.
A query can return a predictable set of arbitrary properties and
components. This component is used by query and other commands to
return data that does not fit into any other component. It may
contain any valid property or component, even if they are not
registered.
9.6. VQUERY Component
Component Name: VQUERY
Purpose: A component describes a set of objects to be acted upon.
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Formal Definition: A "VQUERY" component is defined by the following
notation:
queryc = "BEGIN" ":" "VQUERY" CRLF
queryprop
"END" ":" "VCAR" CRLF
;
queryprop = 1*(
;
; 'queryid' is OPTIONAL but MUST NOT occur
; more than once. If the "TARGET" property
; is supplied then the "QUERYID" property
; MUST be supplied.
;
queryid / target
;
; 'expand' is OPTIONAL but MUST NOT occur
; more than once.
;
expand
;
; the following are OPTIONAL, and MAY occur
; more than once
;
/ name / other-props
;
; the following MUST occur at least once if
; queryid is not supplied.
;
/ query
)
Description: A "VQUERY" contains properties that describe which
properties and components the CS is requested to act upon.
The "QUERYID" property specifies the local identifier for a
"VQUERY" component.
For a search, if the "TARGET" property is supplied in a "VQUERY"
component, then the CS is to search for the query in the CALID
supplied by the "TARGET" property value.
For a create, the "TARGET" property MUST NOT be supplied because
the destination container is already supplied in the "TARGET"
property of the "VCALENDAR" component.
Examples: see Section 6.1.1.
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10. Commands and Responses
CAP commands and responses are described in this section.
10.1. CAP Commands (CMD)
All commands are sent using the CMD property.
Property Name: CMD
Purpose: This property defines the command to be sent.
Value Type: TEXT
Property Parameters: Non-standard, id, localize, latency, action or
options.
Conformance: This property is the method used to specify the commands
to a CS; it can exist in any object sent to the CS.
Description: All of the commands to the CS are supplied in this
property. The "OPTIONS" parameter is overloaded and its meaning
is dependent on the CMD value supplied.
Formal Definition: The property is defined by the following
notation:
cmd = "CMD" (
abort-cmd
/ continue-cmd
/ create-cmd
/ delete-cmd
/ generate-uid-cmd
/ get-capability-cmd
/ identify-cmd
/ modify-cmd
/ move-cmd
/ reply-cmd
/ search-cmd
/ set-locale-cmd
/ iana-cmd
/ x-cmd
) CRLF
;
option-value = "OPTION" "=" paramtext
;
paramtext ; As defined in [iCAL].
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RFC 4324 Calendar Access Protocol December 2005
Calendaring commands allow a CUA to directly manipulate a calendar.
Calendar access rights can be granted or denied for any commands.
10.1.1. Bounded Latency
A CAP command can have an associated maximum latency time by
specifying the "LATENCY" parameter. If the command is unable to be
completed in the specified amount of time (as specified by the
"LATENCY" parameter value with an "ACTION" parameter set to the "ASK"
value), then a "TIMEOUT" command MUST be sent on the same channel".
The reply MUST be a an "ABORT" or a "CONTINUE" command. If the CUA
initiated the original command, then the CS would issue the "TIMEOUT"
command and the CUA would then have to issue an "ABORT" or "CONTINUE"
command. If the CS initiated the original command then the CUA would
have to issue the "TIMEOUT" and the CS would send the "ABORT" or
"CONTINUE".
Upon receiving an "ABORT" command, the command must then be
terminated. Only the "ABORT", "TIMEOUT", "REPLY, and "CONTINUE"
commands cannot be aborted. The "ABORT", "TIMEOUT", and "REPLY"
commands MUST NOT have latency set.
Upon receiving a "CONTINUE" command the work continues as if it had
not been delayed or stopped. Note that a new latency time MAY be
included in a "CONTINUE" command indicating to continue the original
command until the "LATENCY" parameter value expires or the results of
the original command can be returned.
Both the "LATENCY" parameter and the "ACTION" parameter MUST be
supplied to any "CMD" property, or nether can be added to the "CMD"
property. The "LATENCY" parameter MUST be set to the maximum latency
time in seconds. The "ACTION" parameter accepts the following
values: "ASK" and "ABORT" parameters.
If the maximum latency time is exceeded and the "ACTION" parameter is
set to the "ASK" value, then "TIMEOUT" command MUST be sent.
Otherwise, if the "ACTION" parameter is set to the "ABORT" value,
then the command MUST be terminated and return a REQUEST-STATUS code
of 2.0.3 for the original command.
If a CS can both start sending the reply to a command and guarantee
that all of the results can be sent from a command (short of
something like network or power failure) prior to the "LATENCY"
timeout value, then the "LATENCY" time has not expired.
Example:
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RFC 4324 Calendar Access Protocol December 2005
In this example the initiator asks for the listeners capabilities.
I: Content-Type: text/calendar
I:
I: BEGIN:VCALENDAR
I: VERSION:2.0
I: PRODID:The CUA's PRODID
I: CMD;ID=xyz12346;LATENCY=3;ACTION=ask:GET-CAPABILITY
I: END:VCALENDAR
# After 3 seconds
L: Content-Type: text/calendar
L:
L: BEGIN:VCALENDAR
L: PRODID:-//someone's prodid
L: VERSION:2.0
L: CMD;ID=xyz12346:TIMEOUT
L: END:VCALENDAR
In order to continue and give the CS more time, the CUA would issue a
"CONTINUE" command:
I: Content-Type: text/calendar
I:
I: BEGIN:VCALENDAR
I: VERSION:2.0
I: PRODID:-//someone's prodid
I: CMD;ID=xyz12346;LATENCY=3;ACTION=ask:CONTINUE
I: END:VCALENDAR
L: Content-Type: text/calendar
L:
L: BEGIN:VCALENDAR
L: VERSION:2.0
L: PRODID:-//someone's prodid
L: CMD;ID=xyz12346:REPLY
L: BEGIN:VREPLY
L: REQUEST-STATUS:2.0.3;Continued for 3 more seconds
L: END:VREPLY
L: END:VCALENDAR
Here the "2.0.3" status is returned because it is not an error, it is
a progress status sent in reply to the "CONTINUE" command.
To abort the command and not wait any further, issue an "ABORT"
command:
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RFC 4324 Calendar Access Protocol December 2005
I: Content-Type: text/calendar
I:
I: BEGIN:VCALENDAR
I: VERSION:2.0
I: PRODID:-//someone's prodid
I: CMD;ID=xyz12346:ABORT
I: END:VCALENDAR
# Which would result in a 2.0.3 reply.
L: Content-Type: text/calendar
L:
L: BEGIN:VCALENDAR
L: VERSION:2.0
L: PRODID:-//someone's prodid
L: CMD;ID=xyz12346:REPLY
L: BEGIN:VREPLY
L: REQUEST-STATUS:2.0.3;Aborted As Requested.
L: END:VREPLY
L: END:VCALENDAR
If the "ACTION" value had been set to "ABORT", then the listner would
send a "7.0" error on timeout in the reply to the command that
initiated the command that timed out.
10.2. ABORT Command
CMD: ABORT
Purpose: The "ABORT" command is sent to request that the named or the
only in-process command be aborted. Latency MUST not be supplied
with the "ABORT" command.
Formal Definition: An "ABORT" command is defined by the following
notation:
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RFC 4324 Calendar Access Protocol December 2005
abort-cmd = abortparam ":" "ABORT"
;
abortparam = *(
;
; the following are optional,
; but MUST NOT occur more than once
;
id-param
/ localize-param
;
; the following is optional,
; and MAY occur more than once
;
/ other-params
)
The REPLY of any "ABORT" command is:
abort-reply = "BEGIN" ":" "VCALENDAR" CRLF
calprops
abort-vreply
"END" ":" "VCALENDAR" CRLF
;
abort-vreply = "BEGIN" ":" "VREPLY" CRLF
rstatus
other-props
"END" ":" "VREPLY" CRLF
10.3. CONTINUE Command
CMD: CONTINUE
Purpose: The "CONTINUE" command is only sent after a "TIMEOUT"
command has been received to inform the other end of the session
to resume working on a command.
Formal Definition: A "CONTINUE" command is defined by the following
notation:
continue-cmd = continueparam ":" "CONTINUE"
;
continueparam = *(
;
; the following are optional,
; but MUST NOT occur more than once
;
id-param
/ localize-param
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RFC 4324 Calendar Access Protocol December 2005
/ latency-param
;
; the following MUST occur exactly once and only
; when the latency-param has been supplied and
; MUST NOT be supplied if the latency-param is
; not supplied.
;
/ action-param
;
; the following are optional,
; and MAY occur more than once
;
/ other-params
)
The REPLY of any "CONTINUE" command is:
continue-reply = "BEGIN" ":" "VCALENDAR" CRLF
calprops
continue-vreply
"END" ":" "VCALENDAR" CRLF
;
continue-vreply = "BEGIN" ":" "VREPLY" CRLF
rstatus
other-props
"END" ":" "VREPLY" CRLF
10.4. CREATE Command
CMD: CREATE
Purpose: The "CREATE" command is used to create one or more
iCalendar objects in the store in the "BOOKED" or "UNPROCESSED"
state.
A CUA MAY send a "CREATE" command to a CS. The "CREATE" command
MUST be implemented by all CSs.
The CS MUST NOT send a "CREATE" command to any CUA.
Formal Definition: A "CREATE" command is defined by the following
notation and the hierarchy restrictions, as defined in Section
3.2:
create-cmd = createparam ":" "CREATE"
;
createparam = *(
;
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RFC 4324 Calendar Access Protocol December 2005
; the following are optional,
; but MUST NOT occur more than once
;
id-param
/ localize-param
/ latency-param
;
; the following MUST occur exactly once and only
; when the latency-param has been supplied and
; MUST NOT be supplied if the latency-param is
; not supplied.
;
/ action-param
;
; the following is optional,
; and MAY occur more than once
;
/ other-params
)
Response:
One iCalendar object per TARGET property MUST be returned.
The REPLY of any "CREATE" command is limited to the restriction
tables defined in [iTIP] for iTIP objects, in addition to this
ABNF:
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RFC 4324 Calendar Access Protocol December 2005
create-reply = "BEGIN" ":" "VCALENDAR" CRLF
creply-props
1*(create-vreply)
"END" ":" "VCALENDAR" CRLF
;
create-vreply = "BEGIN" ":" "VREPLY" CRLF
created-id
rstatus
other-props
"END" ":" "VREPLY" CRLF
;
; Where the id is appropriate for the
; type of object created:
;
; VAGENDA = relcalid
; VALARM = sequence
; VCAR = carid
; VEVENT, VFREEBUSY, VJOURNAL, VTODO = uid
; VQUERY = queryid
; VTIMEZONE = tzid
; x-comp = x-id
;
created-id = ( relcalid / carid / uid / queryid /
tzid / sequence / x-id)
;
tzid = ; As defined in [iCAL].
;
sequence = ; As defined in [iCAL].
;
uid = ; As defined in [iCAL].
;
x-id = ; An ID for an x-component.
;
creply-props = 4*(
; These are REQUIRED and MUST NOT occur
; more than once.
;
prodid /version / target / reply-cmd
;
; These are optional, and may occur more
; than once.
;
other-props )
For a "CREATE" command, the "TARGET" property specifies the
containers where the components will be created.
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RFC 4324 Calendar Access Protocol December 2005
If the iCalendar object being created does not have a "METHOD"
property, then its state is "BOOKED" and it is not an [iTIP]
scheduling object. Use the "DELETE" command to set the state of
an object to the "DELETED" state (tagged for deletion). A CUA
cannot use the "CREATE" command to create an object in the
"DELETED" state.
If the intention is to book an [iTIP] object, then the "METHOD"
property MUST NOT be supplied. Otherwise, any [iTIP] object MUST
have a valid [iTIP] "METHOD" property value and it is a scheduling
request being deposited into the CS with its state set to
"UNPROCESSED".
Format Definition: ABNF for a "CREATE" object is:
create-object = "BEGIN" ":" "VCALENDAR" CRLF
; If 'calprops' contain the "METHOD" property
; then this 'create-object' component MUST
; conform to [iTIP] restrictions.
;
; calprops MUST include 'create-cmd'
;
calprops
other-props
1*(create-comp)
"END" ":" "VCALENDAR" CRLF
; NOTE: The 'VCALSTORE' component is not included in
; 'create-comp' as it is out of scope for CAP to create
; a new CS.
;
create-comp = agendac / carc / queryc
/ timezonec / freebusyc
/ eventc / todoc / journalc
/ iana-comp / x-comp
;
freebusyc = ; As defined in [iCAL].
;
eventc = ; As defined in [iCAL].
;
journalc = ; As defined in [iCAL].
;
timezonec = ; As defined in [iCAL].
;
todoc = ; As defined in [iCAL].
In the following example, two new top level "VAGENDA" components are
created. Note that the "CSID" value of the server is
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RFC 4324 Calendar Access Protocol December 2005
cal.example.com, which is where the new "VAGENDA" components are
going to be created.
C: Content-Type: text/calendar
C:
C: BEGIN:VCALENDAR
C: PRODID:-//someone's prodid
C: VERSION:2.0
C: CMD;ID=creation01:CREATE
C: TARGET:cal.example.com
C: BEGIN:VAGENDA <- data for 1st new calendar
C: CALID:relcalz1
C: NAME;LANGUAGE=en_US:Bill's Soccer Team
C: OWNER:bill
C: CALMASTER:mailto:bill@example.com
C: TZID:US/Pacific
C: END:VAGENDA
C: BEGIN:VAGENDA <- data for 2nd new calendar
C: CALID:relcalz2
C: NAME;LANGUAGE=EN-us:Mary's personal calendar
C: OWNER:mary
C: CALMASTER:mailto:mary@example.com
C: TZID:US/Pacific
C: END:VAGENDA
C: END:VCALENDAR
S: Content-Type: text/calendar
S:
S: BEGIN:VCALENDAR
S: VERSION:2.0
S: PRODID:-//someone's prodid
S: CMD;ID=creation01:REPLY
S: TARGET:cal.example.com
S: BEGIN:VREPLY <- Reply for 1st calendar create
S: CALID:relcalz1
S: REQUEST-STATUS:2.0
S: END:REPLY
S: BEGIN:VREPLY <- Reply for 2nd calendar create
S: CALID:relcalz2
S: REQUEST-STATUS:2.0
S: END:VREPLY
S: END:VCALENDAR
To create a new component in multiple containers, simply name all
of the containers in the "TARGET" in the create command. A new
"VEVENT" component is created in two TARGET components. In this
example, the "VEVENT" component is one new [iTIP] "REQUEST" to be
Royer, et al. Experimental PAGE 94
RFC 4324 Calendar Access Protocol December 2005
stored in two calendars. The results would be iCalendar objects
that conform to the [iTIP] replies as defined in [iTIP].
This example shows two [iTIP] "VEVENT" components being created in
each of the two supplied "TARGET" properties. As it contains the
"METHOD" property, they will be stored in the "UNPROCESSED" state:
C: Content-Type: text/calendar
C:
C: BEGIN:VCALENDAR
C: VERSION:2.0
C: PRODID:-//someone's prodid
C: CMD;ID=creation02:CREATE
C: METHOD:REQUEST
C: TARGET:relcalz1
C: TARGET:relcalz2
C: BEGIN:VEVENT
C: DTSTART:20030307T180000Z
C: UID:FirstInThisExample-1
C: DTEND:20030307T190000Z
C: SUMMARY:Important Meeting
C: END:VEVENT
C: BEGIN:VEVENT
C: DTSTART:20040307T180000Z
C: UID:SecondInThisExample-2
C: DTEND:20040307T190000Z
C: SUMMARY:Important Meeting
C: END:VEVENT
C: END:VCALENDAR
The CS sends the "VREPLY" commands in separate MIME objects, one
per supplied "TARGET" property value.
S: Content-Type: text/calendar
S:
S: BEGIN:VCALENDAR
S: VERSION:2.0
S: PRODID:-//someone's prodid
S: CMD;ID=creation02:REPLY
S: TARGET:relcalz1 <- 1st TARGET listed.
S: BEGIN:REPLY <- Reply for 1st VEVENT create in 1st TARGET.
S: UID:FirstInThisExample-1
S: REQUEST-STATUS:2.0
S: END:VREPLY
S: BEGIN:REPLY <- Reply for 2nd VEVENT crate in 1st TARGET.
S: UID:SecondInThisExample-2
S: REQUEST-STATUS:2.0
S: END:VREPLY
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S: END:VCALENDAR
And the second reply for the 2nd TARGET:
S: Content-Type: text/calendar
S:
S: BEGIN:VCALENDAR
S: VERSION:2.0
S: PRODID:-//someone's prodid
S: CMD;ID=creation02:REPLY
S: TARGET:relcalz2 <- 2nd TARGET listed
S: BEGIN:REPLY <- Reply for 1st VEVENT create in 2nd TARGET.
S: UID:FirstInThisExample-1
S: REQUEST-STATUS:2.0
S: END:VREPLY
S: BEGIN:REPLY <- Reply for 2nd VEVENT crate in 2nd TARGET.
S: UID:SecondInThisExample-2
S: REQUEST-STATUS:2.0
S: END:VREPLY
S: END:VCALENDAR
10.5. DELETE Command
CMD: DELETE
Purpose: The "DELETE" command physically removes the QUERY result
from the store or marks it for deletion.
A CUA MAY send a "DELETE" command to a CS. The "DELETE" command
MUST be implemented by all CSs.
The CS MUST NOT send a "DELETE" command to any CUA.
Formal Definition: A "DELETE" command is defined by the following
notation:
delete-cmd = deleteparam ":" "DELETE"
;
deleteparam = *(
;
; the following are optional,
; but MUST NOT occur more than once
;
id-param
/ localize-param
/ latency-param
/ option-param "MARK"
;
Royer, et al. Experimental PAGE 96
RFC 4324 Calendar Access Protocol December 2005
; The following MUST occur exactly once and
; only when the latency-param has been supplied.
; It MUST NOT be supplied if the latency-param
; is not supplied.
;
/ action-param
;
; the following is optional,
; and MAY occur more than once
;
/ other-params
)
The "DELETE" command is used to delete calendars or components.
The included "VQUERY" component(s) specifies the container(s) to
delete.
To mark a component for delete without physically removing it,
include the "OPTIONS" parameter with its value set to the "MARK"
value in order to alter its state to "DELETED".
When components are deleted, only the top-most component
"REQUEST-STATUS" properties are returned. No "REQUEST-STATUS"
properties are returned for components inside of the selected
components. There MUST be one "VREPLY" component returned for
each object that is deleted or marked for delete. Note that if no
"VREPLY" components are returned, then nothing matched and nothing
was deleted.
Restriction Table for the "REPLY" command for any "DELETE"
command.
delete-reply = "BEGIN" ":" "VCALENDAR" CRLF
calprops ; MUST include 'reply-cmd'
*(delete-vreply)
"END" ":" "VCALENDAR" CRLF
;
delete-vreply = "BEGIN" ":" "VREPLY" CRLF
deleted-id
rstatus
"END" ":" "VREPLY" CRLF
;
; Where the id is appropriate for the
; type of object deleted:
;
; VAGENDA = relcalid
; VCAR = carid
; VEVENT, VFREEBUSY, VJOURNAL, VTODO = uid
Royer, et al. Experimental PAGE 97
RFC 4324 Calendar Access Protocol December 2005
; VQUERY = queryid
; ALARM = sequence
; VTIMEZONE = tzid
; x-comp = x-id
; An instance = uid recurid
;
deleted-id = ( relcalid / carid / uid / uid recurid
/ queryid / tzid / sequence / x-id )
Example: to delete a "VEVENT" component with "UID" value of
"abcd12345" from the calendar "relcalid-22" from the current CS:
C: Content-Type: text/calendar
C:
C: BEGIN:VCALENDAR
C: TARGET:relcalid-22
C: CMD;ID:"random but unique per CUA":DELETE
C: BEGIN:VQUERY
C: QUERY:SELECT VEVENT FROM VAGENDA WHERE UID = 'abcd12345'
C: END:VQUERY
C: END:VCALENDAR
S: BEGIN:VCALENDAR
S: TARGET:relcalid-22
S: CMD;ID:"random but unique per CUA":REPLY
S: BEGIN:VREPLY
S: UID:abcd12345
S: REQUEST-STATUS:3.0
S: END:VREPLY
S: END:VCALENDAR
One or more iCalendar objects will be returned that contain
"REQUEST-STATUS" properties for the deleted components. More than
one component could have been deleted. Any booked component and
any number of unprocessed [iTIP] scheduling components that
matched the QUERY value in the above example will be returned.
Each unique "METHOD" property value that was deleted from the
store MUST be in a separate iCalendar object. This is because
only one "METHOD" property is allowed in a single "VCALENDAR"
BEGIN/END block.
10.6. GENERATE-UID Command
CMD: GENERATE-UID
Purpose: The "GENERATE-UID" command returns one or more unique
identifiers that MUST be globally unique.
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The "GENERATE-UID" command MAY be sent to any CS. The "GENERATE-
UID" command MUST be implemented by all CSs.
The "GENERATE-UID" command MUST NOT be sent to a CUA.
Formal Definition: A "GENERATE-UID" command is defined by the
following notation:
generate-uid-cmd = genuidparam ":" "GENERATE-UID"
;
genuidparam = *(
;
; The following are optional,
; but MUST NOT occur more than once.
;
id-param
/ localize-param
/ latency-param
;
; The following MUST occur exactly once and
; only when the latency-param has been supplied.
; It MUST NOT be supplied if the latency-param
; is not supplied.
;
/ action-param
;
; The following is optional,
; and MAY occur more than once.
;
/ other-params
;
; The following MUST be supplied exactly once.
; The value specifies the number of UIDs to
; be returned.
;
/ option-param posint1
)
Response:
gen-reply = "BEGIN" ":" "VCALENDAR" CRLF
calprops ; Which MUST include 'reply-cmd'
1*(gen-vreply)
"END" ":" "VCALENDAR" CRLF
gen-vreply = "BEGIN" ":" "VREPLY" CRLF
1*(uid)
rstatus
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RFC 4324 Calendar Access Protocol December 2005
"END" ":" "VREPLY" CRLF
{%%%IS THIS RIGHT%%%?]
Example:
C: BEGIN:VCALENDAR
C: VERSION:2.0
C: PRODID:-//someone's prodid
C: CMD;ID=unique-per-cua-124;OPTIONS=5:GENERATE-UID
C: END:VCALENDAR
S: Content-Type: text/calendar
S:
S: BEGIN:VCALENDAR
S: VERSION:2.0
S: PRODID:-//someone's prodid
S: CMD;ID=unique-per-cua-124:REPLY
S: BEGIN:VREPLY
S: UID:20011121T120000Z-12340@cal.example.com
S: UID:20011121T120000Z-12341@cal.example.com
S: UID:20011121T120000Z-12342@cal.example.com
S: UID:20011121T120000Z-12343@cal.example.com
S: UID:20011121T120000Z-12344@cal.example.com
S: REQUEST-STATUS:2.0
S: END:VREPLY
S: END:VCALENDAR
10.7. GET-CAPABILITY Command
CMD: GET-CAPABILITY
Purpose: The "GET-CAPABILITY" command returns the capabilities of the
other end point of the session.
A CUA MUST send a "GET-CAPABILITY" command to a CS after the
initial connection. A CS MUST send a "GET-CAPABILITY" command to
a CUA after the initial connection. The "GET-CAPABILITY" command
and reply MUST be implemented by all CSs and CUAs.
Formal Definition: A "GET-CAPABILITY" command is defined by the
following notation:
get-capability-cmd = capabilityparam ":" "GET-CAPABILITY"
capabilityparam = *(
; the following are optional,
; but MUST NOT occur more than once
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RFC 4324 Calendar Access Protocol December 2005
;
id-param / localize-param / latency-param
;
; the following MUST occur exactly once and only
; when the latency-param has been supplied and
; MUST NOT be supplied if the latency-param is
; not supplied.
;
/ action-param
;
; the following is optional,
; and MAY occur more than once
;
/ other-params
)
Response:
The "GET-CAPABILITY" command returns information about the
implementation at the other end of the session. The values
returned may differ depending on current user identify and the
security level of the connection.
Client implementations SHOULD NOT require any capability element
beyond those defined in this specification or future RFC
publications. They MAY ignore any nonstandard, experimental
capability elements. The "GET-CAPABILITY" reply may return
different results, depending on the UPN and if the UPN is
authenticated.
When sending a reply to a "GET-CAPABILITY" command, all of these
MUST be supplied. The following properties are returned in
response to a "GET-CAPABILITY" command:
cap-vreply = "BEGIN" ":" "VCALENDAR" CRLF
; The following properties may be in any order.
;
rodid
version
reply-cmd
other-props
"BEGIN" ":" "VREPLY" CRLF
; The following properties may be in any order.
;
cap-version
car-level
components
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RFC 4324 Calendar Access Protocol December 2005
stores-expanded
maxdate
mindate
itip-version
max-comp-size
multipart
query-level
recur-accepted
recur-expand
recur-limit
other-props
"END" ":" "VREPLY" CRLF
"END" ":" "VCALENDAR" CRLF
Example:
I: Content-Type: text/calendar
I:
I: BEGIN:VCALENDAR
I: VERSION:2.0
I: PRODID:-//someone's prodid
I: CMD;ID=unique-per-cua-125:GET-CAPABILITY
I: END:VCALENDAR
L: Content-Type: text/calendar
L:
L: BEGIN:VCALENDAR
L: VERSION:2.0
L: PRODID:-//someone's prodid
L: CMD;ID=unique-per-cua-125:REPLY
L: BEGIN:VREPLY
L: CAP-VERSION:1.0
L: PRODID:The CS prodid
L: QUERY-LEVEL:CAL-QL-1
L: CAR-LEVEL:CAR-FULL-1
L: MAXDATE:99991231T235959Z
L: MINDATE:00000101T000000Z
L: MAX-COMPONENT-SIZE:0
L: COMPONENTS:VCALENDAR,VTODO,VJOURNAL,VEVENT,VCAR,
L: VALARM,VFREEBUSY,VTIMEZONE,STANDARD,DAYLIGHT,VREPLY
L: ITIP-VERSION:2446
L: RECUR-ACCEPTED:TRUE
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L: RECUR-EXPAND:TRUE
L: RECUR-LIMIT:0
L: STORES-EXPANDED:FALSE
L: X-INET-PRIVATE-COMMANDS:1.0
L: END:VREPLY
L: END:VCALENDAR
10.8. IDENTIFY Command
CMD: IDENTIFY
Purpose: The "IDENTIFY" command allows the CUA to set a new identity
to be used for calendar access.
A CUA MAY send an "IDENTIFY" command to a CS. The "IDENTIFY"
command MUST be implemented by all CSs. A CS implementation MAY
reject all "IDENTIFY" commands.
The CS MUST NOT send an "IDENTIFY" command to any CUA.
Formal Definition: An "IDENTIFY" command is defined by the following
notation:
identify-cmd = identifyparam ":" "IDENTIFY"
;
identifyparam = *(
;
; the following are optional,
; but MUST NOT occur more than once
;
id-param
/ localize-param
/ latency-param
;
; the following MUST occur exactly once and only
; when the latency-param has been supplied and
; MUST NOT be supplied if the latency-param is
; not supplied.
;
/ action-param
;
; the following is optional,
; and MAY occur more than once
;
/ other-params
;
; The value is the UPN of the requested
; identity. If option is not supplied it is
Royer, et al. Experimental PAGE 103
RFC 4324 Calendar Access Protocol December 2005
; a request to return to the original
; authenticated identity.
;
/ option-param upn
)
Response:
A "REQUEST-STATUS" property wrapped in a "VREPLY" component with
only one of the following request-status codes:
2.0 Successful.
6.4 Identity not permitted. VCAR restriction.
The CS determines, through an internal mechanism, if the credentials
supplied at authentication permit the operation as the selected
identity. If they do, the session assumes the new identity;
otherwise, a security error is returned.
Example:
C: Content-Type: text/calendar
C:
C: BEGIN:VCALENDAR
C: VERSION:2.0
C: PRODID:-//someone's prodid
C: CMD;ID=unique-per-cua-999;OPTIONS=newUserId:IDENTIFY
C: END:VCALENDAR
S: Content-Type: text/calendar
S:
S: BEGIN:VCALENDAR
S: VERSION:2.0
S: PRODID:-//someone's prodid
S: BEGIN:VREPLY
S: REQUEST-STATUS:2.0;Request Approved
S: END:VREPLY
S: END:VCALENDAR
Or if denied:
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RFC 4324 Calendar Access Protocol December 2005
S: Content-Type: text/calendar
S:
S: BEGIN:VCALENDAR
S: PRODID:-//someone's prodid
S: VERSION:2.0
S: BEGIN:VREPLY
S: REQUEST-STATUS:6.4;Request Denied
S: END:VREPLY
S: END:VCALENDAR
For the CUA to return to its original authenticated identity, the
OPTIONS parameter is omitted:
C: Content-Type: text/calendar
C:
C: BEGIN:VCALENDAR
C: VERSION:2.0
C: PRODID:-//someone's prodid
C: CMD;ID=unique-per-cua-995:IDENTIFY
C: END:VCALENDAR
The CS may accept (2.0) or deny (6.4) the request to return to the
original identity.
If a CS considers the "IDENTIFY" command an attempt to violate
security, the CS MAY terminate the [BEEP] session without any further
notice to the CUA after sending the "REQUEST-STATUS" 6.4 reply.
10.9. MODIFY Command
CMD: MODIFY
Purpose: The "MODIFY" command is used to modify existing components.
A CUA MAY send a "MODIFY" command to a CS. The "MODIFY" command
MUST be implemented by all CSs.
The CS MUST NOT send a "MODIFY" command to any CUA.
Formal Definition: A "MODIFY" command is defined by the following
notation:
modify-cmd = modifyparam ":" "MODIFY"
;
modifyparam = *(
;
; the following are optional,
; but MUST NOT occur more than once
Royer, et al. Experimental PAGE 105
RFC 4324 Calendar Access Protocol December 2005
;
id-param
/ localize-param
/ latency-param
;
; the following MUST occur exactly once and only
; when the latency-param has been supplied and
; MUST NOT be supplied if the latency-param is
; not supplied.
;
/ action-param
;
; the following is optional,
; and MAY occur more than once
;
/ other-params
)
The "MODIFY" command is used to modify existing components. The
TARGET property specifies the calendars that contain the
components that are going to be modified.
The format of the request is three components inside of
"VCALENDAR" component:
BEGIN:VCALENDAR
BEGIN:VQUERY
END:VQUERY
BEGIN:XXX
END:XXX
BEGIN:XXX
END:XXX
END:VCALENDAR
The "VQUERY" component selects the components that are to be
modified.
The "XXX" above is a named component type (VEVENT, VTODO, ...).
Both the old and new components MUST be of the same type.
The old-values is a component and the contents of that component
are going to change and may contain information that helps
uniquely identify the original component (SEQUENCE in the example
below). If the CS cannot find a component that matches the QUERY
and does not have at least all of the OLD-VALUES, then a 6.1 error
is returned.
Royer, et al. Experimental PAGE 106
RFC 4324 Calendar Access Protocol December 2005
The new-values is a component of the same type as old-values and
new-values contains the new data for each selected component. Any
data that is in old-values and not in new-values is deleted from
the selected component. Any values in new-values that was not in
old-values is added to the component.
In this example, the "VEVENT" component with a "UID" property
value of 'unique-58' has the "LOCATION" property and "LAST-
MODIFIED" properties changed, the "VALARM" component with the
"SEQUENCE" property with a value of "3" has its "TRIGGER" property
disabled, the "X-LOCAL" property is removed from the "VEVENT"
component, and a "COMMENT" property is added.
Because "SEQUENCE" property is used to locate the "VALARM"
component in this example, both the old-values and the new-values
contain the "SEQUENCE" property with a value of "3". If the
"SEQUENCE" property were to be left out of new-values, it would
have been deleted.
Example:
C: Content-Type: text/calendar
C:
C: BEGIN:VCALENDAR
C: VERSION:2.0
C: PRODID:-//someone's prodid
C: TARGET:my-cal
C: CMD:ID=unique-mod:MODIFY
C: BEGIN:VQUERY <- Query to select data set.
C: QUERY:SELECT * FROM VEVENT WHERE UID = 'unique-58'
C: END:VQUERY
C: BEGIN:VEVENT <- Start of old data.
C: LOCATION:building 3
C: LAST-MODIFIED:20020101T123456Z
C: X-LOCAL:some private stuff
C: BEGIN:VALARM
C: SEQUENCE:3
C: TRIGGER;RELATED=END:PT5M
C: END:VALARM
C: END:VEVENT <- End of old data.
C: BEGIN:VEVENT <- Start of new data.
C: LOCATION:building 4
C: LAST-MODIFIED:20020202T010203Z
C: COMMENT:Ignore global trigger.
C: BEGIN:VALARM
C: SEQUENCE:3
C: TRIGGER;ENABLE=FALSE:RELATED=END:PT5M
C: END:VALARM
Royer, et al. Experimental PAGE 107
RFC 4324 Calendar Access Protocol December 2005
C: END:VEVENT <- End of new data.
C: END:VCALENDAR
The "X-LOCAL" property was not supplied in the new-values, so it
was deleted. The "LOCATION" property value was altered, as was
the "LAST-MODIFIED" value. The "VALARM" component with a
"SEQUENCE" property value of "3" had its "TRIGGER" property
disabled, and the "SEQUENCE" property value did not change so it
was not effected. The "COMMENT" property was added.
When it comes to inline ATTACHMENTs, the CUA only needs to
uniquely identify the contents of the ATTACHMENT value in the
old-values in order to delete them. When the CS compares the
attachment data, it is compared in its binary form. The
ATTACHMENT value supplied by the CUA MUST be valid encoded
information.
For example, to delete the same huge inline attachment from every
VEVENT in 'my-cal' that has an "ATTACH" property value with the
old-values:
BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//someone's prodid
TARGET:my-cal
CMD:MODIFY
BEGIN:VQUERY
QUERY:SELECT ATTACH FROM VEVENT
END:VQUERY
BEGIN:VEVENT
ATTACH;FMTTYPE=image/basic;ENCODING=BASE64;VALUE=BINARY:
MIICajCCAdOgAwIBAgICbeUwDQYJKoZIhvcNAQEEBQAwdzELMAkGA1U
EBhMCVVMxLDAqBgNVBAoTI05ldHNjYXBlIENvbW11bmljYXRpb25zIE
...< remainder of attachment data NOT supplied >....
END:VEVENT
BEGIN:VEVENT
END:VEVENT
END:VCALENDAR
Here the new-values is empty, so everything in the old-values is
deleted.
Furthermore, the following additional restrictions apply:
1. One cannot change the "UID" property of a component.
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RFC 4324 Calendar Access Protocol December 2005
2. If a contained component is changed inside of a selected
component, and that contained component has multiple instances,
then old-values MUST contain information that uniquely
identifies the instance or instances that are changing. It is
valid to change more than one. All contained components that
match old-values will be modified. In the first modify example
above, if "SEQUENCE" properties were to be deleted from both the
old-values and new-values, then all "TRIGGER" properties that
matched the old-values in all "VALARM" components in the
selected "VEVENT" components would be disabled.
3. The result of the modify MUST be a valid iCalendar object.
Response:
A "VCALENDAR" component is returned with one ore more "REQUEST-
STATUS" property values.
If any error occurred:
No component will be changed at all. That is, it will appear just
as it was prior to the modify and the CAP server SHOULD return a
"REQUEST-STATUS" property for each error that occurred. There
MUST be at least one error reported.
If multiple components are selected, then what uniquely identified
the component MUST be returned (UID, QUERYID, ...) if the component
contains a unique identifier. If it does not, sufficient information
to uniquely identify the modified components MUST be returned in the
reply.
S: Content-Type: text/calendar
S:
S: BEGIN:VCALENDAR
S: TARGET:relcalid
S: CMD;ID=delete#1:REPLY
S: BEGIN:VREPLY
S: BEGIN:VEVENT
S: UID:123
S: REQUEST-STATUS:2.0
S: END:VEVENT
S: END:VREPLY
S: END:VCALENDAR
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10.10. MOVE Command
CMD: MOVE
Purpose: The "MOVE" command is used to move components within the CS.
A CUA MAY send a "MOVE" command to a CS. The "MOVE" command MUST
be implemented by all CSs.
The CS MUST NOT send a "MOVE" command to any CUA.
Formal Definition: A "MOVE" command is defined by the following
notation:
move-cmd = moveparam ":" "MOVE"
;
moveparam = *(
;
; the following are optional,
; but MUST NOT occur more than once
;
id-param
/ localize-param
/ latency-param
;
; the following MUST occur exactly once and only
; when the latency-param has been supplied and
; MUST NOT be supplied if the latency-param is
; not supplied.
;
/ action-param
;
; the following is optional,
; and MAY occur more than once
;
/ other-params
;
)
Response:
The REQUEST-STATUS in a VCALENDAR object.
The content of each "result" is subject to the result restriction
table defined below.
The access control on the "VAGENDA" component, after it has been
moved to its new location in the calstore, MUST be at least as
Royer, et al. Experimental PAGE 110
RFC 4324 Calendar Access Protocol December 2005
secure as it was prior to the move. If the CS is not able to
ensure the same level of security, a permission-denied "REQUEST-
STATUS" property value MUST be returned, and the "MOVE" command
MUST NOT be performed.
The "TARGET" property value specifies the new location, and the
"VQUERY" component specifies the old location.
Restriction Table for the "REPLY" command of any "MOVE" command.
move-reply = "BEGIN" ":" "VCALENDAR" CRLF
calprops
1*(move-vreply)
"END" ":" "VCALENDAR" CRLF
move-vreply = "BEGIN" ":" "VREPLY" CRLF
move-id
rstatus
"END" ":" "VREPLY" CRLF
; Where the id is appropriate for the
; type of object moved:
;
; VAGENDA = relcalid
; VCAR = carid
; VEVENT, VFREEBUSY, VJOURNAL, VTODO = uid
; VQUERY = queryid
; ALARM = sequence
; An instance = uid recurid
; x-comp = x-id
;
move-id = ( relcalid / carid / uid / uid recurid
/ queryid / tzid / sequence / x-id)
Example: moving the VAGENDA Nellis to Area-51
C: Content-Type: text/calendar
C:
C: BEGIN:VCALENDAR
C: VERSION:2.0
C: PRODID:-//someone's prodid
C: CMD:MOVE
C: TARGET:Area-51
C: BEGIN:VQUERY
C: QUERY: SELECT *.* FROM VAGENDA WHERE CALID='Nellis'
C: END:VQUERY
C: END:VCALENDAR
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RFC 4324 Calendar Access Protocol December 2005
S: Content-Type: text/calendar
S:
S: BEGIN:VCALENDAR
S: VERSION:2.0
S: PRODID:-//someone's prodid
S: TARGET:Area-51
S: BEGIN:VREPLY
S: CALID:Nellis
S: REQUEST-STATUS: 2.0
S: END:VREPLY
S: END:VCALENDAR
10.11. REPLY Response to a Command
CMD: REPLY
Purpose: The "REPLY" value to the "CMD" property is used to return
the results of all other commands to the CUA.
A CUA MUST send a "REPLY" command to a CS for any command a CS MAY
send to the CUA. The "REPLY" command MUST be implemented by all
CUAs that support getting the "GET-CAPABILITY" command.
A CS MUST send a "REPLY" command to a CUA for any command a CUA
MAY send to the CS. The "REPLY" command MUST be implemented by
all CSs.
Formal Definition: A "REPLY" command is defined by the following
notation:
reply-cmd = replyparam ":" "REPLY"
;
replyparam = *(
;
; The 'id' parameter value MUST be exactly the
; same as the value sent in the original
; CMD property. If the original CMD did
; not have an 'id' parameter, then the 'id'
; MUST NOT be supplied in the REPLY.
;
id-param
;
; the following is optional,
; and MAY occur more than once
;
/ other-params
)
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10.12. SEARCH Command
CMD: SEARCH
Purpose: The "SEARCH" command is used to return selected components
to the CUA.
A CUA MAY send a "SEARCH" command to a CS. The "SEARCH" command
MUST be implemented by all CSs.
The CS MUST NOT send a "SEARCH" command to any CUA.
Formal Definition: A "SEARCH" command is defined by the following
notation:
search-cmd = searchparam ":" "SEARCH"
;
searchparam = *(
;
; the following are optional,
; but MUST NOT occur more than once
;
id-param
/ localize-param
/ latency-param
;
; the following MUST occur exactly once and only
; when the latency-param has been supplied and
; MUST NOT be supplied if the latency-param is
; not supplied.
;
/ action-param
;
; the following is optional,
; and MAY occur more than once
;
/ other-params
)
The format of the request is the search command (search-cmd)
followed by one or more (query) "VQUERY" components
Response:
The data in each result set contains one or more iCalendar
components composed of all the selected results enclosed in a
single "VREPLY" component per "QUERY".
Royer, et al. Experimental PAGE 113
RFC 4324 Calendar Access Protocol December 2005
Only "REQUEST-STATUS" property and the properties mentioned in the
"SELECT" clause of the QUERY are included in the components. Each
"VCALENDAR" component is tagged with the "TARGET" property.
Searching for objects
In the example below, objects on March 10,1999 between 080000Z and
190000Z are read. In this case only four properties for each
object are returned. Two calendars are specified. Only booked
(vs. scheduled) entries are to be returned (this example only
selected VEVENT objects are to be returned):
C: Content-Type: text/calendar
C:
C: BEGIN:VCALENDAR
C: VERSION:2.0
C: PRODID:-//someone's prodid
C: CMD:SEARCH
C: TARGET:relcal2
C: TARGET:relcal3
C: BEGIN:VQUERY
C: QUERY:SELECT DTSTART,DTEND,SUMMARY,UID
C: FROM VEVENT
C: WHERE DTEND >= '19990310T080000Z'
C: AND DTSTART <= '19990310T190000Z'
C: AND STATE() = 'BOOKED'
C: END:VQUERY
C: END:VCALENDAR
The return values are subject to VCAR filtering. That is, if the
request contains properties to which the UPN does not have access,
those properties will not appear in the return values. If the UPN
has access to at least one property of the component, but has been
denied access to all properties called out in the request, the
response will contain a single "REQUEST-STATUS" property
indicating the error.
Here the request was successful, however one of the "VEVENT"
components contents were not accessible (4.1).
Royer, et al. Experimental PAGE 114
RFC 4324 Calendar Access Protocol December 2005
S: Content-Type: text/calendar
S:
S: BEGIN:VCALENDAR
S: TARGET:relcalid
S: CMD:REPLY
S: VERSION:2.0
S: PRODID:-//someone's prodid
S: BEGIN:VREPLY
S: BEGIN:VEVENT
S: REQUEST-STATUS:4.1
S: END:VEVENT
S: BEGIN:VEVENT
S: REQUEST-STATUS:2.0
S: UID:123
S: DTEND:19990310T080000Z
S: DSTART:19990310T190000Z
S: SUMMARY: Big meeting
S: END:VEVENT
S: END:VREPLY
S: END:VCALENDAR
If the UPN has no access to any components at all, the response
will simply be an empty data set. The response will look the same
if the particular components do not exist.
S: Content-Type: text/calendar
S:
S: BEGIN:VCALENDAR
S: VERSION:2.0
S: PRODID:-//someone's prodid
S: CMD:REPLY
S: TARGET:ralcalid
S: BEGIN:VREPLY
S: REQUEST-STATUS:2.0
S: END:VREPLY
S: END:VCALENDAR
If there are multiple targets, each iCalendar reply is contained
within its own iCalendar object.
10.12.1. Searching for VFREEBUSY
If a CS sets the "RECUR-EXPAND" property to "TRUE" and contains the
"VFREEBUSY" component in the "COMPONENTS" value in a reply to the
"GET-CAPABILITY" command, then it is the CS's responsibility (and not
the CUA's responsibility) to provide the correct "VFREEBUSY"
information for a calendar.
Royer, et al. Experimental PAGE 115
RFC 4324 Calendar Access Protocol December 2005
If a CUA issues a "CREATE" "VFREEBUSY", such a CS MUST return success
and not store the "VFREEBUSY" component as the results would never be
used.
Such a CS MUST dynamically create the results of a search for
"VFREEBUSY" components at search time when searching for STATE() =
'BOOKED' items.
If a CUA searches for "VFREEBUSY" components with STATE() =
'UNPROCESSED', such a CS MUST return a "VREPLY" with no components.
If a CUA searches for "VFREEBUSY" components without specifying the
STATE, such a CS MUST return the same result as if STATE()='BOOKED'
had been specified.
For CSs that set the "CAPABILITY" "RECUR-EXPAND" property to "FALSE"
and have the "VFREEBUSY" component in the "COMPONENTS" value in the
"CAPABILITY" reply, a CUA MAY store the "VFREEBUSY" information on
the CS. These CSs then MUST return a "VFREEBUSY" component
calculated from the stored components. If no "VFREEBUSY" information
is available for the "TARGET" calendar, then a "VFREEBUSY" with no
blocked out time will be returned with a success code. A CUA sets
the "VFREEBUSY" time on a/those calendars by creating a "VFREEBUSY"
component without a "METHOD" creating a "BOOKED" entry.
If a CS does not set the "VFREEBUSY" value in the "COMPONENTS"
"CAPABILITY" value, the CS does not support the "VFREEBUSY" component
and all creation and searching for a "VFREEBUSY" component MUST fail.
Examples of calendars that may be in this category are public event
calendars that will never require scheduling with other UPNs.
10.13. SET-LOCALE Command
CMD: SET-LOCALE
Purpose: The "SET-LOCALE" command is used to select the locale that
will be used in error codes that are used in the "REQUEST-STATUS"
property.
A CUA MAY send a "SET-LOCALE" command to a CS. The SET-LOCALE
command MUST be implemented by all CSs.
The CS MUST NOT send a "SET-LOCALE" command to any CUA.
Formal Definition: A "SET-LOCALE" command is defined by the following
notation:
setlocale-cmd = setlocaleparam ":" "SET-LOCALE"
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RFC 4324 Calendar Access Protocol December 2005
;
setlocaleparam = *(
;
; the following are optional,
; but MUST NOT occur more than once
;
id-param
/ localize-param
/ latency-param
/ setlocale-option
;
; the following MUST occur exactly once and only
; only when the latency-param has been supplied.
; It MUST NOT be supplied if the latency-param
; is not supplied.
;
/ action-param
;
; the following is optional,
; and MAY occur more than once
;
/ other-params )
setlocale-option = option-param newlocale
;
newlocale = ; Any locale supplied in the initial [BEEP]
; "greeting" "localize" parameter and
; and any charset supported by the CS
; and listed in the DEFAULT-CHARSET property
; of the VCALSTORE
Examples:
CMD:OPTIONS=en_US.UTF-8:SET-LOCALE
CMD:OPTIONS=th_TH.ISO8859-11:SET-LOCALE
CMD:OPTIONS=es_MX.ISO8859-1:SET-LOCALE
Restriction Table for the "REPLY" command of any "SET-LOCALE"
command.
setlocale-reply = "BEGIN" ":" "VCALENDAR" CRLF
calprops
1*(setlocale-vreply)
"END" ":" "VCALENDAR" CRLF
setlocale-vreply = "BEGIN" ":" "VREPLY" CRLF
rstatus
"END" ":" "VREPLY" CRLF
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10.14. TIMEOUT Command
CMD: TIMEOUT
Purpose: The "TIMEOUT" command is only sent after a command has been
sent with a latency value set. When received, it means the
command could not be completed in the time allowed.
Formal Definition: A "TIMEOUT" command is defined by the following
notation:
timeout-cmd = timeoutparam ":" "TIMEOUT"
timeoutparam = *(
; the following are optional,
; but MUST NOT occur more than once
id-param
/ localize-param
/ other-params
)
10.15. Response Codes
Numeric response codes are returned using the "REQUEST-STATUS"
property.
The format of these codes is described in [iCAL] and extended in
[iTIP] and [iMIP]. The following describes new codes added to this
set and how existing codes apply to CAP.
At the application layer, response codes are returned as the value of
a "REQUEST-STATUS" property. The value type of this property is
modified from that defined in [iCAL], in order to make the
accompanying "REQUEST-STATUS" property text optional.
Code Description
--------------------------------------------------------------
2.0 Success. The parameters vary with the
operation and are specified.
2.0.3 In response to the client issuing an
"abort" reply, this reply code indicates
that any command currently underway was
successfully aborted.
3.1.4 Capability not supported.
4.1 Calendar store access denied.
Royer, et al. Experimental PAGE 118
RFC 4324 Calendar Access Protocol December 2005
6.1 Container not found.
6.2 Attempt to create or modify an object
that would overlap another object
in either of the following two circumstances:
(a) One of the objects has a TRANSP
property set to OPAQUE-NOCONFLICT or
TRANSPARENT-NOCONFLICT.
(b) The calendar's ALLOW-CONFLICT
property is set to FALSE.
6.3 Bad args.
6.4 Permission denied - VCAR restriction.
A VCAR exists and the CS will not perform
the operation.
7.0 A timeout has occurred. The server was
unable to complete the operation in the
requested time.
8.0 A failure has occurred in the CS
that prevents the operation from
succeeding.
8.1 A query was performed and the query is
too complex for the CS. The operation
was not performed.
8.2 Used to signal that an iCalendar object has
exceeded the server's size limit
8.3 A DATETIME value was too far in the future
to be represented on this Calendar.
8.4 A DATETIME value was too far in the past
to be represented on this Calendar.
8.5 An attempt was made to create a new
object, but the unique UID specified is
already in use.
9.0 An unrecognized command was received.
Or an unsupported command was received.
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RFC 4324 Calendar Access Protocol December 2005
10.4 The operation has not been performed
because it would cause the resources
(memory, disk, CPU, etc) to exceed the
allocated quota.
--------------------------------------------------------------
11. Object Registration
This section provides the process for registration of new or modified
properties, parameters, commands, or other modifications, additions,
or deletions to objects.
11.1. Registration of New and Modified Entities
New objects are registered by the publication of an IETF Request for
Comment (RFC). Changes to objects are registered by the publication
of a revision to the RFC in a new RFC.
11.2. Post the Item Definition
The object description MUST be posted to the new object discussion
list: ietf-calendar@imc.org.
11.3. Allow a Comment Period
Discussion on a new object MUST be allowed to take place on the list
for a minimum of two weeks. Consensus MUST be reached on the object
before proceeding to the next step.
11.4. Release a New RFC
The new object will be submitted for publication like any other
Internet Draft requesting RFC status.
12. BEEP and CAP
12.1. BEEP Profile Registration
BEEP replies will be one-to-one (1:1 MSG/RPY) if possible, and one-
to-many (1:many MSG/ANS) when the "TARGET" property value changes.
No more than one "TARGET" property value is allowed per reply.
Profile Identification: specify a [URI] that authoritatively
identifies this profile.
http://iana.org/beep/cap/1.0
Message Exchanged during Channel Creation:
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RFC 4324 Calendar Access Protocol December 2005
CUAs SHOULD supply the BEEP "localize" attributes in the BEEP
"greeting" messages.
CSs SHOULD supply the BEEP "localize" attributes in the BEEP
"greeting" messages.
CUAs SHOULD supply the BEEP "serverName" attribute at channel
creation time to the CS, so that, if the CS is performing virtual
hosting, the CS can determine the intended virtual host. CSs that
do not support virtual hosting may ignore the BEEP "serverName"
attribute.
Messages starting one-to-one exchanges:
The initial message, after authentication in each direction, MUST
be a single "text/calendar" object containing a CAP "CAPABILITY"
CMD. It must not be part of a MIME multipart message.
After the initial message, a BEEP "MSG" may contain one or more
MIME objects (at least one of which MUST be "text/calendar"), and
each "text/calendar" MIME object MUST contain a CAP "CMD"
property.
Multiple iCalendar objects may be sent in a single BEEP message
either by representing them as separate MIME text/calendar parts
contained within a MIME multipart/mixed part or by simple
concatenation within a single text/calendar MIME object.
In either case, all iCalendar objects that are transmitted
together must have the same TARGET property.
The sending of multipart MIME entities over BEEP is not permitted
for CAP unless the other endpoint has indicated its ability to
accept them via the appropriate CAPABILITY.
Messages in positive replies:
After the initial message, a BEEP "RPY" may contain one or more
MIME objects (at least one of which MUST be "text/calendar"), and
each "text/calendar" MIME object MUST contain a CAP "CMD"
property. All "text/calendar" MIME objects in a single BEEP "RPY"
messages MUST have the same "TARGET" property value.
Multiple iCalendar objects may be sent in a single BEEP message by
either representing them as separate MIME text/calendar parts
contained within a MIME multipart/mixed part or by simple
concatenation within a single text/calendar MIME object.
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RFC 4324 Calendar Access Protocol December 2005
In either case, all iCalendar objects transmitted together must
have the same TARGET property.
Sending multipart MIME entities over BEEP is not permitted for CAP
unless the other endpoint has indicated its ability to accept them
via the appropriate CAPABILITY.
Messages in negative replies:
Will contain any valid "text/calendar" MIME object that contains
CAP "REQUEST-STATUS" property and a CAP "CMD" property with a
property value of "REPLY". And where the CS has determined the
requested operation to be a fatal error. And when the CS has
performed NO operation that effected the contents of any part of
the CS or any calendar controlled by the CS.
Messages in one-to-many exchanges:
After the initial message then a BEEP "MSG" may contain one or
more MIME objects at least one of which MUST be "text/calendar"
and each "text/calendar" MIME object MUST contain a CAP "CMD"
property.
The BEEP "MSG" messages can only contain MIME "multipart" MIME
objects if the other endpoint has received a CAP "CAPABILITY"
indicating the other endpoint supports multipart MIME objects.
This does not prevent the endpoint from sending multiple [iCAL]
'icalobject' objects in a single BEEP "MSG" so long as all of them
have the same "TARGET" property value.
Multiple iCalendar objects may be sent in a single BEEP message by
either representing them as separate MIME text/calendar parts
contained within a MIME multipart/mixed part or by simple
concatenation within a single text/calendar MIME object.
In either case, all iCalendar objects transmitted together must
have the same TARGET property.
The sending of multipart MIME entities over BEEP is not permitted
for CAP unless the other endpoint has indicated its ability to
accept them via the appropriate CAPABILITY.
Message Syntax:
They are CAP "text/calendar" MIME objects as specified in this
memo.
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RFC 4324 Calendar Access Protocol December 2005
Message Semantics:
As defined in this memo.
12.2. BEEP Exchange Styles
[BEEP] defines three styles of message exchange:
MSG/ANS,ANS,...,NUL - For one to many exchanges.
MSG/RPY - For one to one exchanges.
MSG/ERR - For requests the cannot be processed due to an error.
A CAP request targeted at more than one container MAY use a one- to-
many exchange with a distinct answer associated with each target. A
CAP request targeted at a single container MAY use a one-to-one
exchange or a one-to-many exchange. "MSG/ERR" MAY only be used when
an error condition prevents the execution of the request on all the
targeted calendars.
12.3. BEEP Connection Details
All CAP communications must be done securely, so the initial greeting
includes the TLS profile.
L: <wait for incoming connection>
I: <open connection>
L: RPY 0 0 . 0 110
L: Content-Type: application/beep+xml
L:
L: <greeting>
L: <profile uri='http://iana.org/beep/TLS' />
L: </greeting>
L: END
I: RPY 0 0 . 0 52
I: Content-Type: application/beep+xml
I:
I: <greeting/>
I: END
At this point, the connection is secure. The TLS profile 'resets'
the connection, so it resends the greetings, advertises the CAP
profiles that are supported, and replies with the profile selected
(only one profile exists at this time):
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RFC 4324 Calendar Access Protocol December 2005
L: <wait for incoming connection>
I: <open connection>
L: RPY 0 0 . 0 110
L: Content-Type: application/beep+xml
L:
L: <greeting>
L: <profile uri='http://iana.org/beep/cap/1.0'/>
L: </greeting>
L: END
I: RPY 0 0 . 0 110
I: Content-Type: application/beep+xml
I:
I: <greeting>
I: <profile uri='http://iana.org/beep/cap/1.0'/>
I: </greeting>
I: END
Each channel must be authenticated before work can start, but
starting a channel involves authentication. Any SASL profile may be
included, for example:
<profile uri='http://iana.org/beep/SASL/OTP'/>
<profile uri='http://iana.org/beep/SASL/DIGEST-MD5'/>
<profile uri='http://iana.org/beep/SASL/ANONYMOUS'/>
Example of anonymous channel:
C: <start number='1'>
C: <profile uri='http://iana.org/beep/SASL/ANONYMOUS'/>
C: </start>
S: RPY 0 1 . 221 87
S: Content-Type: application/beep+xml
S:
S: <profile uri='http://iana.org/beep/SASL/ANONYMOUS'/>
S: END
Example of DIGEST-MD5 channel:
C: <start number='1'>
C: <profile uri='http://iana.org/beep/SASL/DIGEST-MD5'/>
C: </start>
S: RPY 0 1 . 221 87
S: Content-Type: application/beep+xml
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RFC 4324 Calendar Access Protocol December 2005
S:
S: <profile uri='http://iana.org/beep/SASL/DIGEST-MD5'/>
S: END
Piggybacking the "CAPABILITY" command.
The "CAPABILITY" reply may be included during channel start (see
RFC 3080, section 2.3.1.2), as BEEP allows the start command to
include the initial data transfer. This reduces the number of round
trips to initiate a CAP session.
13. IANA Considerations
This memo defines IANA-registered extensions to the attributes
defined by iCalendar, as defined in [iCAL], and [iTIP].
IANA registration proposals for iCalendar and [iTIP] are to be mailed
to the registration agent for the "text/calendar" [MIME] content-
type, <MAILTO: ietf-calendar@imc.org> using the format defined in
section 7 of [iCAL].
The the IANA has registered the profile specified in Section 12.1,
and has selected an IANA-specific URI: http://iana.org/beep/cap/1.0.
14. Security Considerations
Access rights should be granted cautiously. Without careful
planning, it is possible to open up access to a greater degree than
desired.
The "IDENTIFY" command should be carefully implemented. If it is
done incorrectly, UPNs may gain access as other, unintended, UPNs.
The "IDENTIFY" command may not chain; that is, the identity is always
validated against the original UPN and not the new UPN.
Since CAP is a profile of [BEEP], consult [BEEP]'s Section 9 for a
discussion of BEEP-specific security issues.
There are risks of allowing anonymous UPNs to deposit REQUEST and
REFRESH objects (calendar spam and denial-of-service, for example).
Implementations should consider methods to restrict anonymous
requests to within acceptable usages.
CS implementations might consider automatically creating VCARs that
allow CAP ATTENDEEs in booked objects to deposit REFRESH and REPLY
objects for those UIDs if they otherwise do not have access rather
then opening up world access. And they may also consider allowing
COUNTER objects for those ATTENDEEs.
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RFC 4324 Calendar Access Protocol December 2005
When an object is booked by a CUA ,the CS reply may wish to include
warning messages to the CUA for ATTENDEEs that have CAP urls that do
not have local UPNs as those ATTENDEES may be unable to REPLY or
REFRESH. Some CSs may wish this to be an error.
Although service provisioning is a policy matter, at a minimum, all
implementations must provide the following tuning profiles:
o for authentication: http://iana.org/beep/SASL/DIGEST-MD5
o for confidentiality: http://iana.org/beep/TLS (using the
TLS_RSA_WITH_3DES_EDE_CBC_SHA cipher)
o for both: http://iana.org/beep/TLS (using the
TLS_RSA_WITH_3DES_EDE_CBC_SHA cipher supporting client-side
certificates)
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RFC 4324 Calendar Access Protocol December 2005
Appendix A. Acknowledgements
The following individuals were major contributors to the drafting and
discussion of this memo, and they are greatly appreciated:
Alan Davies, Andrea Campi, Andre Courtemanche, Andrew Davison, Anil
Srivastava, ArentJan Banck, Arnaud Quillaud, Benjamin Sonntag,
Bernard Desruisseaux, Bertrand Guiheneuf, Bob Mahoney, Bob Morgan,
Bruce Kahn, Chris Dudding, Chris Olds, Christopher Apple, Cortlandt
Winters, Craig Johnson, Cyrus Daboo, Damon Chaplin, Dan Hickman, Dan
Kohn, Dan Winship, Darryl Champagne, David C. Thewlis, David Nicol,
David Nusbaum, David West, Derik Stenerson, Eric R. Plamondon, Frank
Dawson, Frank Nitsch, Gary Frederick, Gary McGath, Gilles Fortin,
Graham Gilmore, Greg Barnes, Greg FitzPatrick, Harald Alvestrand,
Harrie Hazewinkel, Helge Hess, Jagan Garimella, Jay Parker, Jim Ray,
Jim Smith, Joerg Reichelt, John Berthels, John Smith, John Stracke,
Jonathan Lennox, JP Rosevear, Karen Chu, Katie Capps Parlante, Kees
Cook, Ken Crawford, Ki Wong, Lars Eggert, Lata Kannan, Lawrence
Greenfield, Libby Miller, Lisa Dusseault, Lyndon Nerenberg, Mark
Davidson, Mark Paterson, Mark Smith, Mark Swanson, Mark Tearle,
Marshall Rose, Martijn van Beers, Martin Jackson, Matthias Laabs, Max
Froumentin, Micah Gorrell, Michael Fair, Mike Higginbottom, Mike
Hixson, Murata Makoto, Natalia Syracuse, Nathaniel Borenstein, Ned
Freed, Olivier Gutknecht, Patrice Lapierre, Patrice Scattolin, Paul
Hoffman, Paul Sharpe, Payod Deshpande, Pekka Pessi, Peter Thompson,
Preston Stephenson, Prometeo Sandino Roman Corral, Ralph Patterson,
Robert Lusardi, Robert Ransdell, Rob Siemborski, Satyanarayana
Vempati, Satya Vempati, Scott Hollenbeck, Seamus Garvey, Shannon
Clark, Shriram Vishwanathan, Steve Coya, Steve Mansour, Steve Miller,
Steve Vinter, Stuart Guthrie, Suchet Singh Khalsa, Ted Hardie, Tim
Hare, Timo Sirainen, Vicky Oliver, Paul Hill, and Yael Shaham-Gafni.
Appendix B. References
Appendix B.1. Normative References
[ABNF] Crocker, D., Ed. and P. Overell, "Augmented BNF for
Syntax Specifications: ABNF", RFC 4234, October 2005.
[BEEP] Rose, M., "The Blocks Extensible Exchange Protocol Core",
RFC 3080, March 2001.
[BEEPTCP] Rose, M., "Mapping the BEEP Core onto TCP", RFC 3081,
March 2001.
[BEEPGUIDE] Rose, M., "BEEP, The Definitive Guide", ISBN 0-596-
00244-0, O'Reilly & Associates, Inc.
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RFC 4324 Calendar Access Protocol December 2005
[GUIDE] Mahoney, B., Babics, G., and A. Taler, "Guide to Internet
Calendaring", RFC 3283, June 2002.
[iCAL] Dawson, F. and D. Stenerson, "Internet Calendaring and
Scheduling Core Object Specification (iCalendar)", RFC
2445, November 1998.
[iTIP] Silverberg, S., Mansour, S., Dawson, F., and R. Hopson,
"iCalendar Transport-Independent Interoperability
Protocol (iTIP) Scheduling Events, BusyTime, To-dos and
Journal Entries", RFC 2446, November 1998.
[iMIP] Dawson, F., Mansour, S., and S. Silverberg, "iCalendar
Message-Based Interoperability Protocol (iMIP)", RFC
2447, November 1998.
[MIME] Freed, N. and N. Borenstein, "Multipurpose Internet Mail
Extensions (MIME) Part One: Format of Internet Message
Bodies", RFC 2045, November 1996.
[RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, BCP 14, March 1997.
Appendix B.2. Informative References
[CHARREG] Freed, N. and J. Postel, "IANA Charset Registration
Procedures", RFC 2278, January 1998.
[CHARPOL] Alvestrand, H., "IETF Policy on Character Sets and
Languages", RFC 2277, January 1998.
[RFC 2822] Resnick, P., Ed., "Internet Message Format", RFC 2822,
April 2001.
[SASL] Myers, J., "Simple Authentication and Security Layer
(SASL)", RFC 2222, October 1997.
[SQL92] "Database Language SQL", ANSI/ISO/IEC 9075: 1992, aka
ANSI X3.135-1992, aka FIPS PUB 127-2
[SQLCOM] ANSI/ISO/IEC 9075:1992/TC-1-1995, Technical corrigendum 1
to ISO/IEC 9075: 1992, also adopted as Amendment 1 to
ANSI X3.135.1992
[URLGUIDE] Masinter, L., Alvestrand, H., Zigmond, D., and R. Petke,
"Guidelines for new URL Schemes", RFC 2718, November
1999.
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RFC 4324 Calendar Access Protocol December 2005
[URI] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifiers (URI): Generic Syntax", RFC 3986,
January 2005.
[URL] Berners-Lee, T, Masinter, L., and M. McCahil, "Uniform
Resource Locators (URL)", RFC 1738, December 1994.
[X509CRL] Housley, R., Polk, W., Ford, W., and D. Solo, "Internet
X.509 Public Key Infrastructure Certificate and
Certificate Revocation List (CRL) Profile", RFC 3280,
April 2002.
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RFC 4324 Calendar Access Protocol December 2005
Authors' Addresses
Doug Royer
IntelliCal, LLC
267 Kentlands Blvd. #3041
Gaithersburg, MD 20878
US
Phone: +1-866-594-8574
Fax: +1-866-594-8574
EMail: Doug@IntelliCal.com
URI: http://Royer.com
George Babics
Oracle
600 Blvd. de Maisonneuve West
Suite 1900
Montreal, Quebec H3A 3J2
CA
Phone: +1-514-905-8694
EMail: george.babics@oracle.com
Steve Mansour
eBay
2145 Hamilton Avenue
San Jose, CA 95125
USA
Phone: +1-408-376-8817
EMail: smansour@ebay.com
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RFC 4324 Calendar Access Protocol December 2005
Full Copyright Statement
Copyright © The Internet Society (2005).
This document is subject to the rights, licenses and restrictions
contained in BCP 78, and except as set forth therein, the authors
retain all their rights.
This document and the information contained herein are provided on an
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OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
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Acknowledgement
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Internet Society.
Royer, et al. Experimental PAGE 131
Calendar Access Protocol (CAP)
RFC TOTAL SIZE: 254638 bytes
PUBLICATION DATE: Monday, December 19th, 2005
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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