iCalendar Element Registries

Created

2009-04-29

Last Updated

2023-12-06

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

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] [RFC Errata 7381]
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]

iCalendar Element Registries

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

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