iCalendar Element Registries

Created

2009-04-29

Last Updated

2023-02-21

Note

A Standards Track RFC is required for registration of iCalendar elements that 
modify elements previously documented in a Standards Track RFC.

Available Formats

XML

HTML

Plain text

Registries included below

Components
Properties
Parameters
Value Data Types
Calendar User Types
Free/Busy Time Types
Participation Statuses
Relationship Types
Participation Roles
Actions
Classifications
Methods
REQUEST-STATUS Values
Schedule Agent Values Registry
Schedule Force Send Values Registry
Display Types
Feature Types
Participant Types
Resource Types
Proximity Values

Components

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Available Formats

CSV

Component	Status	Reference
VCALENDAR	Current	[RFC5545], Section 3.4
VEVENT	Current	[RFC5545], Section 3.6.1
VTODO	Current	[RFC5545], Section 3.6.2
VJOURNAL	Current	[RFC5545], Section 3.6.3
VFREEBUSY	Current	[RFC5545], Section 3.6.4
VTIMEZONE	Current	[RFC5545], Section 3.6.5
VALARM	Current	[RFC5545], Section 3.6.6
STANDARD	Current	[RFC5545], Section 3.6.5
DAYLIGHT	Current	[RFC5545], Section 3.6.5
VAVAILABILITY	Current	[RFC7953], Section 3.1
AVAILABLE	Current	[RFC7953], Section 3.1
PARTICIPANT	Current	[RFC9073], Section 7.1
VLOCATION	Current	[RFC9073], Section 7.2
VRESOURCE	Current	[RFC9073], Section 7.3

Properties

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Available Formats

CSV

Property	Status	Reference
CALSCALE	Current	[RFC5545], Section 3.7.1
METHOD	Current	[RFC5545], Section 3.7.2
PRODID	Current	[RFC5545], Section 3.7.3
VERSION	Current	[RFC5545], Section 3.7.4
ATTACH	Current	[RFC5545], Section 3.8.1.1
CATEGORIES	Current	[RFC5545], Section 3.8.1.2; [RFC7986], Section 5.6
CLASS	Current	[RFC5545], Section 3.8.1.3
COMMENT	Current	[RFC5545], Section 3.8.1.4
DESCRIPTION	Current	[RFC5545], Section 3.8.1.5; [RFC7986], Section 5.2
GEO	Current	[RFC5545], Section 3.8.1.6
LOCATION	Current	[RFC5545], Section 3.8.1.7
PERCENT-COMPLETE	Current	[RFC5545], Section 3.8.1.8
PRIORITY	Current	[RFC5545], Section 3.8.1.9
RESOURCES	Current	[RFC5545], Section 3.8.1.10
STATUS	Current	[RFC5545], Section 3.8.1.11
SUMMARY	Current	[RFC5545], Section 3.8.1.12
COMPLETED	Current	[RFC5545], Section 3.8.2.1
DTEND	Current	[RFC5545], Section 3.8.2.2
DUE	Current	[RFC5545], Section 3.8.2.3
DTSTART	Current	[RFC5545], Section 3.8.2.4
DURATION	Current	[RFC5545], Section 3.8.2.5
FREEBUSY	Current	[RFC5545], Section 3.8.2.6
TRANSP	Current	[RFC5545], Section 3.8.2.7
TZID	Current	[RFC5545], Section 3.8.3.1
TZNAME	Current	[RFC5545], Section 3.8.3.2
TZOFFSETFROM	Current	[RFC5545], Section 3.8.3.3
TZOFFSETTO	Current	[RFC5545], Section 3.8.3.4
TZURL	Current	[RFC5545], Section 3.8.3.5
ATTENDEE	Current	[RFC5545], Section 3.8.4.1
CONTACT	Current	[RFC5545], Section 3.8.4.2
ORGANIZER	Current	[RFC5545], Section 3.8.4.3
RECURRENCE-ID	Current	[RFC5545], Section 3.8.4.4
RELATED-TO	Current	[RFC5545], Section 3.8.4.5; [RFC9253], Section 9.1
URL	Current	[RFC5545], Section 3.8.4.6; [RFC7986], Section 5.5
UID	Current	[RFC5545], Section 3.8.4.7; [RFC7986], Section 5.3
EXDATE	Current	[RFC5545], Section 3.8.5.1
EXRULE	Deprecated	[RFC2445], Section 4.8.5.2
RDATE	Current	[RFC5545], Section 3.8.5.2
RRULE	Current	[RFC5545], Section 3.8.5.3
ACTION	Current	[RFC5545], Section 3.8.6.1
REPEAT	Current	[RFC5545], Section 3.8.6.2
TRIGGER	Current	[RFC5545], Section 3.8.6.3
CREATED	Current	[RFC5545], Section 3.8.7.1
DTSTAMP	Current	[RFC5545], Section 3.8.7.2
LAST-MODIFIED	Current	[RFC5545], Section 3.8.7.3; [RFC7986], Section 5.4
SEQUENCE	Current	[RFC5545], Section 3.8.7.4
REQUEST-STATUS	Current	[RFC5545], Section 3.8.8.3
XML	Current	[RFC6321], Section 4.2
TZUNTIL	Current	[RFC7808], Section 7.1
TZID-ALIAS-OF	Current	[RFC7808], Section 7.2
BUSYTYPE	Current	[RFC7953], Section 3.2
NAME	Current	[RFC7986], Section 5.1
REFRESH-INTERVAL	Current	[RFC7986], Section 5.7
SOURCE	Current	[RFC7986], Section 5.8
COLOR	Current	[RFC7986], Section 5.9
IMAGE	Current	[RFC7986], Section 5.10
CONFERENCE	Current	[RFC7986], Section 5.11
CALENDAR-ADDRESS	Current	[RFC9073], Section 6.4
LOCATION-TYPE	Current	[RFC9073], Section 6.1
PARTICIPANT-TYPE	Current	[RFC9073], Section 6.2
RESOURCE-TYPE	Current	[RFC9073], Section 6.3
STRUCTURED-DATA	Current	[RFC9073], Section 6.6
STYLED-DESCRIPTION	Current	[RFC9073], Section 6.5
ACKNOWLEDGED	Current	[RFC9074], Section 6.1
PROXIMITY	Current	[RFC9074], Section 8.1
CONCEPT	Current	[RFC9253], Section 8.1
LINK	Current	[RFC9253], Section 8.2
REFID	Current	[RFC9253], Section 8.3

Parameters

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Available Formats

CSV

Parameter	Status	Reference
ALTREP	Current	[RFC5545], Section 3.2.1
CN	Current	[RFC5545], Section 3.2.2
CUTYPE	Current	[RFC5545], Section 3.2.3
DELEGATED-FROM	Current	[RFC5545], Section 3.2.4
DELEGATED-TO	Current	[RFC5545], Section 3.2.5
DIR	Current	[RFC5545], Section 3.2.6
ENCODING	Current	[RFC5545], Section 3.2.7
FMTTYPE	Current	[RFC5545], Section 3.2.8
FBTYPE	Current	[RFC5545], Section 3.2.9
LANGUAGE	Current	[RFC5545], Section 3.2.10
MEMBER	Current	[RFC5545], Section 3.2.11
PARTSTAT	Current	[RFC5545], Section 3.2.12
RANGE	Current	[RFC5545], Section 3.2.13
RELATED	Current	[RFC5545], Section 3.2.14
RELTYPE	Current	[RFC5545], Section 3.2.15
ROLE	Current	[RFC5545], Section 3.2.16
RSVP	Current	[RFC5545], Section 3.2.17
SCHEDULE-AGENT	Current	[RFC6638], Section 7.1
SCHEDULE-FORCE-SEND	Current	[RFC6638], Section 7.2
SCHEDULE-STATUS	Current	[RFC6638], Section 7.3
SENT-BY	Current	[RFC5545], Section 3.2.18
TZID	Current	[RFC5545], Section 3.2.19
VALUE	Current	[RFC5545], Section 3.2.20
DISPLAY	Current	[RFC7986], Section 6.1
EMAIL	Current	[RFC7986], Section 6.2
FEATURE	Current	[RFC7986], Section 6.3
LABEL	Current	[RFC7986], Section 6.4
SIZE	Current	[RFC8607], Section 4.1
FILENAME	Current	[RFC8607], Section 4.2
MANAGED-ID	Current	[RFC8607], Section 4.3
ORDER	Current	[RFC9073], Section 5.1
SCHEMA	Current	[RFC9073], Section 5.2
DERIVED	Current	[RFC9073], Section 5.3
GAP	Current	[RFC9253], Section 6.2
LINKREL	Current	[RFC9253], Section 6.1

Value Data Types

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Note

A Standards Track RFC is REQUIRED for the registration of new Value Data Types that modify
existing properties.

Available Formats

CSV

Value Data Type	Status	Reference
BINARY	Current	[RFC5545], Section 3.3.1
BOOLEAN	Current	[RFC5545], Section 3.3.2
CAL-ADDRESS	Current	[RFC5545], Section 3.3.3
DATE	Current	[RFC5545], Section 3.3.4
DATE-TIME	Current	[RFC5545], Section 3.3.5
DURATION	Current	[RFC5545], Section 3.3.6
FLOAT	Current	[RFC5545], Section 3.3.7
INTEGER	Current	[RFC5545], Section 3.3.8
PERIOD	Current	[RFC5545], Section 3.3.9
RECUR	Current	[RFC5545], Section 3.3.10
TEXT	Current	[RFC5545], Section 3.3.11
TIME	Current	[RFC5545], Section 3.3.12
UNKNOWN	Reserved - Do not use	[RFC7265], Section 5
URI	Current	[RFC5545], Section 3.3.13
UTC-OFFSET	Current	[RFC5545], Section 3.3.14
XML-REFERENCE	Current	[RFC9253], Section 7
UID	Current	[RFC9253], Section 7

Calendar User Types

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Available Formats

CSV

Calendar User Type	Status	Reference
INDIVIDUAL	Current	[RFC5545], Section 3.2.3
GROUP	Current	[RFC5545], Section 3.2.3
RESOURCE	Current	[RFC5545], Section 3.2.3
ROOM	Current	[RFC5545], Section 3.2.3
UNKNOWN	Current	[RFC5545], Section 3.2.3

Free/Busy Time Types

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Available Formats

CSV

Free/Busy Time Type	Status	Reference
FREE	Current	[RFC5545], Section 3.2.9
BUSY	Current	[RFC5545], Section 3.2.9
BUSY-UNAVAILABLE	Current	[RFC5545], Section 3.2.9
BUSY-TENTATIVE	Current	[RFC5545], Section 3.2.9

Participation Statuses

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Note

A Standards Track RFC is REQUIRED for the registration of Participation Status values 
to be used in "VEVENT" calendar components.

Available Formats

CSV

Participation Status	Status	Reference
NEEDS-ACTION	Current	[RFC5545], Section 3.2.12
ACCEPTED	Current	[RFC5545], Section 3.2.12
DECLINED	Current	[RFC5545], Section 3.2.12
TENTATIVE	Current	[RFC5545], Section 3.2.12
DELEGATED	Current	[RFC5545], Section 3.2.12
COMPLETED	Current	[RFC5545], Section 3.2.12
IN-PROCESS	Current	[RFC5545], Section 3.2.12

Relationship Types

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Available Formats

CSV

Relationship Type	Status	Reference
CHILD	Current	[RFC5545], Section 3.2.15
PARENT	Current	[RFC5545], Section 3.2.15
SIBLING	Current	[RFC5545], Section 3.2.15
SNOOZE	Current	[RFC9074], Section 7.1
CONCEPT	Current	[RFC9253], Section 5
DEPENDS-ON	Current	[RFC9253], Section 5
FINISHTOFINISH	Current	[RFC9253], Section 4
FINISHTOSTART	Current	[RFC9253], Section 4
FIRST	Current	[RFC9253], Section 5
NEXT	Current	[RFC9253], Section 5
REFID	Current	[RFC9253], Section 5
STARTTOFINISH	Current	[RFC9253], Section 4
STARTTOSTART	Current	[RFC9253], Section 4

Participation Roles

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Available Formats

CSV

Role Type	Status	Reference
CHAIR	Current	[RFC5545], Section 3.2.16
REQ-PARTICIPANT	Current	[RFC5545], Section 3.2.16
OPT-PARTICIPANT	Current	[RFC5545], Section 3.2.16
NON-PARTICIPANT	Current	[RFC5545], Section 3.2.16

Actions

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Available Formats

CSV

Action	Status	Reference
AUDIO	Current	[RFC5545], Section 3.8.6.1
DISPLAY	Current	[RFC5545], Section 3.8.6.1
EMAIL	Current	[RFC5545], Section 3.8.6.1
PROCEDURE	Deprecated	[RFC2445], Section 4.8.6.1

Classifications

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Available Formats

CSV

Classification	Status	Reference
PUBLIC	Current	[RFC5545], Section 3.8.1.3
PRIVATE	Current	[RFC5545], Section 3.8.1.3
CONFIDENTIAL	Current	[RFC5545], Section 3.8.1.3

Methods

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5545]

Available Formats

CSV

Method	Status	Reference
PUBLISH	Current	[RFC5546]
REQUEST	Current	[RFC5546]
REPLY	Current	[RFC5546]
ADD	Current	[RFC5546]
CANCEL	Current	[RFC5546]
REFRESH	Current	[RFC5546]
COUNTER	Current	[RFC5546]
DECLINECOUNTER	Current	[RFC5546]

REQUEST-STATUS Values

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Bernard Desruisseaux, Ken Murchison, Mike Douglass

Reference

[RFC5546]

Available Formats

CSV

Status Code	Status	Reference
1.0	Current	[RFC6638], Section 3.2.9.1
1.1	Current	[RFC6638], Section 3.2.9.2
1.2	Current	[RFC6638], Section 3.2.9.3
2.0	Current	[RFC5546], Section 3.6.1
2.1	Current	[RFC5546], Section 3.6.2
2.2	Current	[RFC5546], Section 3.6.3
2.3	Current	[RFC5546], Section 3.6.4
2.4	Current	[RFC5546], Section 3.6.5
2.5	Current	[RFC5546], Section 3.6.6
2.6	Current	[RFC5546], Section 3.6.7
2.7	Current	[RFC5546], Section 3.6.8
2.8	Current	[RFC5546], Section 3.6.9
2.9	Current	[RFC5546], Section 3.6.10
2.10	Current	[RFC5546], Section 3.6.11
2.11	Current	[RFC5546], Section 3.6.12
3.0	Current	[RFC5546], Section 3.6.13
3.1	Current	[RFC5546], Section 3.6.14
3.2	Current	[RFC5546], Section 3.6.15
3.3	Current	[RFC5546], Section 3.6.16
3.4	Current	[RFC5546], Section 3.6.17
3.5	Current	[RFC5546], Section 3.6.18
3.6	Current	[RFC5546], Section 3.6.19
3.7	Current	[RFC5546], Section 3.6.20
3.8	Current	[RFC5546], Section 3.6.21
3.9	Current	[RFC5546], Section 3.6.22
3.10	Current	[RFC5546], Section 3.6.23
3.11	Current	[RFC5546], Section 3.6.24
3.12	Current	[RFC5546], Section 3.6.25
3.13	Current	[RFC5546], Section 3.6.26
3.14	Current	[RFC5546], Section 3.6.27
4.0	Current	[RFC5546], Section 3.6.28
5.0	Current	[RFC5546], Section 3.6.29
5.1	Current	[RFC5546], Section 3.6.30
5.2	Current	[RFC5546], Section 3.6.31
5.3	Current	[RFC5546], Section 3.6.32

Schedule Agent Values Registry

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Unassigned

Reference

[RFC6638]

Available Formats

CSV

Schedule Agent	Status	Reference
SERVER	Current	[RFC6638], Section 7.1
CLIENT	Current	[RFC6638], Section 7.1
NONE	Current	[RFC6638], Section 7.1

Schedule Force Send Values Registry

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Unassigned

Reference

[RFC6638]

Available Formats

CSV

Schedule Force Send	Status	Reference
REQUEST	Current	[RFC6638], Section 7.2
REPLY	Current	[RFC6638], Section 7.2

Display Types

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Unassigned

Reference

[RFC7986]

Available Formats

CSV

Display Type	Status	Reference
BADGE	Current	[RFC7986], Section 6.1
GRAPHIC	Current	[RFC7986], Section 6.1
FULLSIZE	Current	[RFC7986], Section 6.1
THUMBNAIL	Current	[RFC7986], Section 6.1

Feature Types

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Unassigned

Reference

[RFC7986]

Available Formats

CSV

Name	Status	Reference
AUDIO	Current	[RFC7986], Section 6.3
CHAT	Current	[RFC7986], Section 6.3
FEED	Current	[RFC7986], Section 6.3
MODERATOR	Current	[RFC7986], Section 6.3
PHONE	Current	[RFC7986], Section 6.3
SCREEN	Current	[RFC7986], Section 6.3
VIDEO	Current	[RFC7986], Section 6.3

Participant Types

Registration Procedure(s)

Expert Review

Expert(s)

Ken Murchison, Michael Douglass

Reference

[RFC9073]

Available Formats

CSV

Participant Type	Status	Reference
ACTIVE	Current	[RFC9073], Section 6.2
INACTIVE	Current	[RFC9073], Section 6.2
SPONSOR	Current	[RFC9073], Section 6.2
CONTACT	Current	[RFC9073], Section 6.2
BOOKING-CONTACT	Current	[RFC9073], Section 6.2
EMERGENCY-CONTACT	Current	[RFC9073], Section 6.2
PUBLICITY-CONTACT	Current	[RFC9073], Section 6.2
PLANNER-CONTACT	Current	[RFC9073], Section 6.2
PERFORMER	Current	[RFC9073], Section 6.2
SPEAKER	Current	[RFC9073], Section 6.2

Resource Types

Registration Procedure(s)

Expert Review

Expert(s)

Ken Murchison, Michael Douglass

Reference

[RFC9073]

Available Formats

CSV

Resource Type	Status	Reference
PROJECTOR	Current	[RFC9073], Section 6.3
ROOM	Current	[RFC9073], Section 6.3
REMOTE-CONFERENCE-AUDIO	Current	[RFC9073], Section 6.3
REMOTE-CONFERENCE-VIDEO	Current	[RFC9073], Section 6.3

Proximity Values

Registration Procedure(s)

Expert Review with RFC Required

Expert(s)

Ken Murchison, Michael Douglass

Reference

[RFC9074]

Available Formats

CSV

Value	Status	Reference
ARRIVE	Current	[RFC9074], Section 8.1
DEPART	Current	[RFC9074], Section 8.1
CONNECT	Current	[RFC9074], Section 8.1
DISCONNECT	Current	[RFC9074], Section 8.1