WikiJuanan : i Cal

http://www.ietf.org/internet-drafts/draft-hare-xcalendar-03.txt
uses attributes for vcalendar prodid and version
defines a «-IETFDTD XCAL/iCalendar XML//EN» iCalendar dtd
uses attributes for parameters

Royer 2005 «iCalendar in XML Format (xCal-Basic)"

http://inet-consulting.com/xcal.html
draft-royer-calsch-xcal-02
puts prodid and version in elements
uses lowercase for tag names but upper case for param values like role="CHAIR" and rrule content like BYDAY

XML schema here:

http://sw.sbay.org/xml/

http://sw.sbay.org/xml/xcal-20040224.xsd

SKICal http://skical.metamatrix.se/

swedish; some good enhancements related to public events

“RDF Calendar”

http://esw.w3.org/topic/RdfCalendar

http://www.w3.org/2002/12/cal/

http://www.w3.org/TR/rdfcal/

hCalendar http://developers.technorati.com/wiki/hCalendar

http://microformats.org/wiki/hcalendar-brainstorming
xhtml encoding

iCalendar Basic http://www.ietf.org/internet-drafts/draft-royer-ical-basic-03.txt

simplifies iCalendar

http://xml.coverpages.org/draft-royer-ical-vcard-01.txt

Using VCARDs with iCalendar
allows ATTENDEE;VCARDURL="https:cal.example.com/user?uid=vcard=123.vcf":CAP:Doug@Royer.com?

http://www.iptc.org/EventsML/

seems to have died

Regarding vCard and XML:

http://xml.coverpages.org/vcard.html

overview

draft-dawson-vcard-xml-dtd-0[0–3]

http://www.watersprings.org/pub/id/draft-dawson-vcard-xml-dtd-03.txt
<vCard xmlns:xcfxml='http://www.ietf.org/internet-drafts/draft-dawson-vcard-xml-dtd-04.txt'>
<n><family>Dawson</family> <given>Frank</given></n>
<org><orgname>Lotus Development Corporation</orgname>
<adr adr.type="WORK POSTAL PARCEL">
<street>6544 Battleford Drive</street>

<locality>Raleigh</locality>
<region>NC</region>
<pcode>27613–3502</pcode>
<country>USA</country>

</adr>

http://www.jabber.org/jeps/jep-0054.html

carrying forward from Dawson
elements names are upper case
version is an attribute
params are self-closing element children
namespace is vcard-temp

=head1 Standard Protocols

Cal DAV? http://greenbytes.de/tech/webdav/draft-dusseault-caldav-01.html

http://www.faqs.org/rfcs/rfc2446.html

iCalendar Transport-indendent Interoperability Protocol (iTIP)
static and dynamic event, to-do, journal and free/busy objects
either store and forward (imip) or real-time
CU calendar user to CU communication
CUA and CS

http://www.faqs.org/rfcs/rfc2447.html

[iMIP] specifies an Internet email binding for [iTIP].

http://www.ietf.org/internet-drafts/draft-ietf-calsch-cap-02.txt

CAP Calendar Access Protocol
the CUA to CS communication

IRIP

real-time analog of imip. maybe being superseded by CAP?

ICAP – defunct proposal (96), see http://www.clearblue.com/draft-oleary-icap-00.htm

http://maelstrom.org.uk/

Steve Ferris implemented ICAP java client and server, with source

other proposals:

Scheduling Wide-area Transport Protocol SWTP

http://www.p2software.com/

intranet consulting

Simple Scheduling Transport Protocol (SSTP) presented by On Technology

dead?

Calendaring and Scheduling Interoperability Protocol (CSIP) presented by On Time / FTP? Software

now opentext
web based

Internet Calendar Access Protocol (ICAP) presented by Clear Blue Network Systems and Lotus

now criticalpath

=head1 Open Source Projects

Name Born Died URL
Free Association 2000 http://www.advogato.org/proj/Free%20Association/
Reefknot 2001 http://reefknot.sourceforge.net/
Hula 2005 http://www.hula-project.org/ Novell's old Net Mail? server
OSA/Chandler 2003 http://www.osafoundation.org/

=head1 Articles and Link Farms

http://www.innerjoin.org/iCalendar/index.html

http://linuxmafia.com/faq/Apps/scheduling.html

Date Lens? http://www.cs.umd.edu/hcil/datelens/screenshots.shtml

new design for a calendar
requires. NET

got eaten by Microsoft:

http://research.microsoft.com/news/monthlyfeature/datelens.aspx

http://www.w3.org/2001/sw/Europe/200210/calendar/vocab_usecases.html

Semantic Web Calendaring vocabularies and usecases
some interesting comments about the specs
discusses iCalendar, xCalendar, Ski Cap?

http://www.idealliance.org/papers/xml2001/papers/html/05-04-06.html

Calendaring and Scheduling with XML-RDF

draft-ietf-calsch-imp-guide-00.txt

Once more into the Breach: Calendars, Events and RSS 2003

http://laughingmeme.org/archives/001224.html

rant about calendar support in evolution:

http://luke.hates-software.com/2004/05/03/d940c010.html
also digs at mozilla calendar

Scheduling Ourselves to Death

http://www.kcoyle.net/schedule.html

=head1 Desired Features

Some desired features:

categories
email reminders
indicate public and private when publishing
publishing of free busy
scheduling system (somehow)
RSS feed
handle recurring events
handle multi-day and all-day events
booking of rooms or other equipment
send email to server to pick up an event (or pull from your email)
pull in public holiday db (country-specific), and/or commemorative day db
search by string in summary, qbe, etc.
merging of desired set of calendars
control of sorting by: recur vs. recur, has start time and duration, has start time only, neither start time nor duration

=head1 Google Base

See

http://base.google.com/base/atom_specs.html

http://base.google.com/base/attribute_list.html#event_date_range

<g:event_date_range>

<g:start>2005–12-20T14:00:00</g:start>
<g:end>2005–12-20T19:00:00</g:end>

</g:event_date_range>

<g:expiration_date>2005–12–20</g:expiration_date>
<g:expiration_date_time>2005–12-05T11:59:59</g:expiration_date_time>

<g:location>1600 Amphitheatre Parkway, Mountain View, CA, 94043, USA</g:location>
<g:location>37.423130,-122.083706</g:location>

<g:image_link>http://example.com/images/1006.jpg</g:image_link>

See some discussion here:

http://weblog.infoworld.com/udell/2006/06/13.html

http://www.snellspace.com/wp/?p=314

doesn't like the new elements vs just including xcal or hcalendar

=head1 Ji Cal?

See http://jical.sourceforge.net/

Has its own XML format that includes expanded events.

=head1 iCalendar RFC2445

See http://www.softwarestudio.org/iCal/2445Issues.html

Synctactically, iCalendar/vCalendar/vCard are similar.
It is roughly “field: value”, though the field names can be parametrized.
Field values can contain 8-bit characters.
Lines can be LWS wrapped (lines SHOULD be no longer than 75 octets).

RFC 2445 grammar, in part:

contentline = name *(";" param ) “:" value CRLF
name = x-name / iana-token
iana-token = 1*(ALPHA / DIGIT / “-")
x-name = “X-" [vendorid “-"] 1*(ALPHA / DIGIT / “-")
vendorid = 3*(ALPHA / DIGIT)
param = param-name "=" param-value *("," param-value)
param-name = iana-token / x-token
param-value = paramtext / quoted-string
paramtext = *SAFE-CHAR
value = *VALUE-CHAR
quoted-string = DQUOTE *QSAFE-CHAR DQUOTE
NON-US-ASCII = %x80-F8
QSAFE-CHAR = WSP / %x21 / %x23–7E / NON-US-ASCII
SAFE-CHAR = WSP / %x21 / %x23–2B / %x2D-39 / %x3C-7E / NON-US-ASCII
VALUE-CHAR = WSP / %x21–7E / NON-US-ASCII

Values can contain escapes: \, \" \n

cal-address type examples (for example for ORGANIZER property):

"MAILTO:jane_doe@host1.com"
«CN=John Smith?;DIR="ldap://host.com:6666/o=3DDC%20Associates,c=3DUS??(cn=3DJohn%20Smith)":MAILTO:jsmith@host1.com
«ROLE=CHAIR:MAILTO:mrbig@host.com»

URL property examples:

"URL:http://abc.com/pub/calendars/jsmith/mytime.ics"
«URL;VALUE=URI:http://davidcrow.ca/»
"URL:http://host2.com/pub/busy/jpublic-01.ifb" (for a VFREEBUSY)

=head1 iCalendar Issues

Recurrence is complex, probably overly so.

The standard requires that timezones be defined inline, yet
there may be redefinitions of those timezones in the future
that even affect future dates in existing calendars.
This can mean conflicts with the conventional definition
of the same-named timezones. This could happen with distant
future events in old calendars,, as well as recurring events
beyond a change in the definition.

The properties such as UID, DTSTAMP, CREATED contrast
“calendar store” with “object representation”. This has unclear
meaning when objects might be reformatted, republished, and so on.
The semantics of references to other objects such as by RELATED-TO are similarly
confusing.

DTEND is unclearly defined.

Many properties could be used with different semantics, and in
some cases you'd like to use more than one such meaning at once.
For example:

is URL the authoritative ics file? a web page? a brochure?
what about ATTACH? Note it can have a URI value also.
(cv. WHURL and PROMO in Ski Cal?)

iCalendar is focused on business meetings (ATTENDEE property, SENT-BY parameter, etc.),
without a similar degree of support for public events.
For example:

no distinction between event title and summary (Ski Cal? TITLE)
no way to indicate a set of multiple performers/speakers (Ski Cal? PERSONS, SKiROLE)
no way to indicate type of location (radio, TV, indoors, outdoors) (Ski Cal? VENUE)
no structured way to specify admission information (cost, tickets, reservations, etc.)

Ski Cal? ACCESS PRICE PAYMETHOD BOOKINGS PROHIBITED

no way to indicate the languages spoken at the event (vs. language of text in description) (Ski Cal? SKILANG)
no easy way to indicate a schedule within the event (Ski Cal? OPTIMESET)

It has weak support for alternate DESCRIPTIONs (html vs. text; short vs. long).
There is the ALTREP parameter, but it makes little sense outside of a MIME context that can provide additional attributes.
There is the LANGUAGE parameter which apparently allows for multiple LOCATION and DESCRIPTION
and other text properties that otherwise can occur only once --
although the RFC is unclear on this, as 4.6.1 “eventprop” production says
that “the following are optional, but MUST NOT occur more than once”.

There is no certain way of distinguishing an unknown time, an unspecified time,
and an all-day event. Or of saying «some day between may 1 and may 8".

What distinguishes COMMENT from DESCRIPTION?

The LOCATION is free text, with no structured address support such as with
vCard (place name, address, phone), nor a distinct directions field
(like Ski Cal? DIRECTIONS, PLACENAME properties; TRAVELBY parameter).

ORGANIZER is too limited as cal-address, and CONTACT is too free.
What if the real organizer is an organization with a title, phone, etc.?

There is weak and unclear specification for charsets: Can UTF-16BE be used?
What to do once a VCALENDAR is detached from a MIME container?

There is no property for a VCALENDAR title (like X-WR-CALNAME) or the owning organization of a VCALENDAR.

Multi-user change tracking is weak (no distinction between submitted by,
posted by, posted when, etc. — each of which might differ from the organizer).
Ski Cal? has PUBLISHER and MANAGEMENT, but those still don't really cover
it all either.

There is no suggested manner for namespace control on values of
enumerated properties and parameters (CATEGORIES property, RESOURCES property,
ROLE parameter, etc.) (see Ski Cal? NSREF).

=head1 Example Event

===================================================
Teaser

Hear From a Courageous African Woman Who Stood Up
to the Vicious Ethnic Cleansing of the Black Community of
Tampa, Florida – and Won!

Title:

“Is the San Francisco Bay Area for Whites Only? A Forum on Ethnic Cleansing”

Subtitle:

with housing community activist Connie Burton from Tampa, Florida

When:

Tuesday, June 29th, 7 to 9:30pm

Where:

Fellowship Hall of Humanity, 390- 27th St., ( between Telegraph and Broadway), Oakland

Contact:

African People's Solidarity Committee, (510) 295–7834
Call (510) 295–7834 for more info, leave a voicemail at 510–625-1106, or email uhurureparations@yahoo.com

Description:

On this coming Tuesday, June 29th from 7 to 9:30pm, the African
People's Solidarity Committee is holding “Is the San Francisco Bay
Area for Whites Only? A Forum on Ethnic Cleansing” at the Fellowship
Hall of Humanity at 390 – 27th St (between Broadway and Telegraph) in
Oakland.

Featured as the keynote speaker will be Connie Burton, leader in the
International People's Democratic Uhuru Movement out of Tampa,
Florida.

Several months ago, Burton led an African community struggle against
the city of Tampa's plans to kick African people out of the Tampa Park
apartments in what the city considered “prime real estate.”

Utilizing the combination of her weekly “Straight Talk” radio program
she hosts in Tampa with massive leafleting, bullhorning, protests and
participation in weekly Tampa housing authority meetings, the Uhuru
Movement in Tampa under Connie's leadership was able to push out the
city's latest ethnic cleansing plan to remove black people from the
neighborhood!

Join this discussion about the devastating situation that exists from
the Tampa Bay to the SF Bay as African people are forced from their
communities. Through policies of police containment and a U.S.-imposed
drug economy, young Africans in their communities in the Bay area face
prison, the military, or the grave while people people are able to
move into their neighborhoods.

Other speakers at the forum include:
Quetzaocelocuia of the Barrio Defense Committee in San Jose,
Maurice Campbell of the Community First Coalition of Bayview-Hunter's Point,
Bakari Olatunji of the International People's Democratic Uhuru Movement in Oakland,
Wendy Snyder of the African People's Solidarity Committee.

Let's take a stand from the white community to support genuine economic development and an end to the war on the African community!

Brochure:

download the leaflet at

http://mrwillis.crosswinds.net/Leaflet_Uploads/Gentrification.pdf

=head1 Proposed Schema

Here is a proposed schema.
We attempt to indicate here the mapping of field(s) between our schema,
iCalendar, and Atom.

Area
When

when_start DTSTART, @TZID

ISO8601 datetime with any precision (year down to second)
has a numerical tz offset, unless “floating”.
offset taken from @TZID param, which is a name

when_duration DTEND, DURATION

(we use duration instead of end to avoid extra rules about tz etc.)
if missing, then it is considered unknown (vs. 0 duration)
cannot have more precision than start

when_recur RRULE, EXRULE, RDATE, EXDATE

Where LOCATION (multi-line plain text)

whole location might be stored internally

where_name single line free text
where_addr_pobox the 7 vCard ADR fields; pobox and extended probably not used
where_addr_extended
where_addr_street
where_addr_city
where_addr_province
where_addr_postal
where_addr_country
where_phone
where_url URL, home page for location
where_directions type=content (might be a link to directions)
where_geo GEO (two floats long/lat)

What

all content fields can have content-type and lang

summary SUMMARY

type=content
in iCalendar, free plain text, typically single line.
used in isolation of rest of info. defaults to title, then to beginning of description

title -

if a movie, etc. that has a distinct title. will be shown in quotes.

subtitle shown with the title, should not be set without it
description DESCRIPTION

type=content
in iCalendar, multiple lines of free plain text which
includes all people involved, and any schedule

link* ATTACH, URL

RFC2445 URL;VALUE=URI could be either the event or an ICS; it is vague
attributes: rel href type (like Atom and HTML. Atom defines rel to be a URI or one of several tokens. type is media type here, and Atom says content/@type is broader)
HTML says rel is CDATA, space-separated:

http://www.w3.org/TR/REC-html40/struct/links.html#h-12.3
rel="eventhome" “flyer” “brochure” “registration”
eventhome = a html home page specifically for the event (vs. typically pdf for flyer)

category* CATEGORIES

exactly the same as Atom: term (text) label (text) scheme (URI)
no restrictions on term:

http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.2.2
(alternative designs: URIs, TOKENs, QNames, labels)
TBD: namespace declaration, and schema of choice labels (Ski Cal? NSREF is unspecified what the URI points to)
one or more from various vocabularies
event_type: concert, movie, art (poetry, dance, painting), conference,

forum, educational/training,protest(march,vigil), group meeting,
fundraiser, social (celebration, etc.)

topic: police,prisons,education,health,democracy,

human rights,environment,homelessness,international economy,history,law,race,labor,drugs
incident: Katrina
geoname (which it is about, not held at, such as from Getty or usgov Metropolitan Statistical Area): Iraq,Africa

http://www.getty.edu/research/conducting_research/vocabularies/tgn/

http://geography.about.com/cs/largecities/a/metromicro.htm

admission tickets, reservation, price, etc.

Who ORGANIZER, CONTACT

organizer_name organization name or individual name
contact_name specific individual to contact
organizer_email
organizer_url home page
organizer_phone

Changes CREATED LAST-MODIFIED UID URL

created_by
created_date
source_url original ics
last_modified

Some come from a fixed vocabulary of choices:

event_type
topics

Some would be fkeys to a separate “address” table:

location
contact
organizer

full_name
street
street2
city
state
postal_code
country
directions
phone
mobile
email
homepage

===================================================
=head1 RDF Calendar

RDF model for iCal: http://web.resource.org/rss/1.0/modules/event/

notes that date precision is significant

more RDF and iCalendar: http://www.ninebynine.org/RDFNotes/Calendaring/iCal-proposal.html

http://esw.w3.org/topic/RdfCalendarDocumentation

http://swordfish.rdfweb.org/discovery/2003/11/rdfical/www2004-draft-20031113-final.html

RDFiCal: iCalendar in RDF

http://www.w3.org/2001/sw/Europe/200404/rssical/rssical.html

RSS and RDF iCalendar

http://www.w3.org/2002/12/cal/

RDF Calendar
ical2rdf.pl now replaced by fromIcal.py
has tools to convert schema from rfc to rdf/owl
Dan Connolly

http://dublincore.org/2003/12/08/dctype#Event

dulbin core “Event” type DCMI

=head1 Ski Cal?

http://swordfish.rdfweb.org/people/libby/rdfweb/skical/skical-daml.daml
http://swordfish.rdfweb.org/people/libby/rdfweb/skical/skical-daml-diary.txt

iCalender/skical in DAML+oil

http://skical.metamatrix.se/
Structured Knowledge Initiative
http://skical.metamatrix.se/skical20010905.html
http://xml.coverpages.org/draft-many-ical-ski-06.txt

(defunct?)
better suited for public (non corporate events)
Ski Cal? – an extension of iCalendar
adds WHAT,WHEN,WHERE,WHOW,WHY,WHO
SKIROLE
OPTIMESET opening time set
OPTIMES
TITLE (of the movie, etc.,, vs. SUMMARY)
PERSONS (performer, presenter, etc.)
CONTROL
MANAGEMENT
DIRECTIONS
PROMO
PUBLISHER
WHURL url associated
VENUE
PLACENAME
PRICE
PAYMETHOD
BOOKINGS
ACCESS[ibility]
NAMESPACE

=head1 Libraries

perl

ccal

http://www.dns.net/dist/ccal-1.6

(uses its own quick and dirty parser)
GPL

http://www.simondobson.org/downloads/files/ical2vcal

iCal (v2) to vCal (v1) converter, using Text::vFile

Icabra http://isg.ee.ethz.ch/tools/isgtc/index.cgi?page=module_source;module=icabra;source=icabra

GPL

ical2rdf.pl http://www.w3.org/2002/12/cal/ical2rdf.pl

W3 license. iCal convert to RDF. see also fromIcal.py

jclark on the perl modules:

http://jclark.org/weblog/Programming/Perl/priorart.html

python

http://labix.org/python-dateutil

http://vobject.skyhouseconsulting.com/svn/vobject/parsing.py

vobject Apache license vobject

http://svn.plone.org/view/collective/Calendaring/trunk/parser.py?op=file&rev=10643&sc=0

GPL.

http://codespeak.net/icalendar/

LGPL

http://distfiles.master.finkmirrors.net/ccal041.py

GPL curses calendar manager

http://www.w3.org/2002/12/cal/fromIcal.py

W3 license. iCal convert to RDF. see also ical2rdf.pl

http://sourceforge.net/projects/collective http://plone.org/newsitems/ploneicalendar/talkback/1087233044

Plone implementation.

Erlang

http://www.stacken.kth.se/projekt/yxa/cpl_implementation.html

Java

http://recurrance.sourceforge.net/

Apache license. implements RRULE

http://wiki.osafoundation.org/bin/view/Journal/JeffreyHarrisToDo

who can say.

http://ical4j.sourceforge.net/

MIT license. parser.

http://co-project.lboro.ac.uk/users/coch2/jical-1.4/docs/html/

Ji Cal?. LGPL. iCalendar to html

http://dev.w3.org/cvsweb/Ical2html/

W3 license. C. iCalendar to HTML. uses libical.

libical http://www.softwarestudio.org/libical/ and http://www.aurore.net/projects/libical/

LGPL/MPL
libical-0.24 (Nov 24) was last release
being picked up at

http://www.aurore.net/projects/libical/

http://korganizer.kde.org/develop/architecture.html

libkcal is C++ wrapper around libical

http://cvs.gnome.org/viewcvs/libmimedir/mimedir/

LGPL parser. handles vCard, vCal, iCalendar.
not to be confused with

http://sourceforge.net/projects/libmimedir/
maintained by Sebastian Rittau <srittau@jroger.in-berlin.de>

Ruby

http://icalendar.rubyforge.org/

http://vpim.rubyforge.org/

http://www.infinitenil.com/developers.html

http://www.macdevcenter.com/pub/a/mac/2003/09/03/rubycocoa.html?page=last&x-maxdepth=0

http://noir.s7.xrea.com/pub/zaurus/ics2csv.rb

GPL ruby converts ics to a CSV

Objective C

http://svn.opengroupware.org/SOPE/trunk/sope-ical/iCalSaxDriver/README

LGPL. objective C. parser of iCalendar. for converting icalendar to sax parse events corresponding to xCal.

http://remotecalendars.sourceforge.net/

COM plugin for Outlook

http://sourceforge.net/projects/icalparser/

GPL C# primarily to convert to RDF

PHP

http://www.k5n.us/webcalendar.php?topic=FAQ

Web Calendar?

http://cvs.drupal.org/viewcvs/drupal/contributions/sandbox/thehunmonkgroup/eventrepeat/eventrepeat.module?view=markup

drupal module

opengroupware
http://dev.wp-plugins.org/file/ical-events/trunk/import_ical.php

wordpress plugin

Lisp

http://de.geocities.com/ulf_jasper/lisp/icalendar.el.txt

=head1 Perl Modules

perl cpan support

problems with cpan iCalendar modules at

http://jclark.org/weblog/Programming/Perl/priorart.html

Date Time?::Format::ICal http://search.cpan.org/dist/DateTime-Format-ICal/lib/DateTime/Format/ICal.pm

part of the latest datetime.perl.org project

Dave Rolksy
adopted from Date::Ical
will parse recurrence (also uses Date Time?::Event::ICal)

Date Time?::Event::ICal http://search.cpan.org/dist/DateTime-Event-ICal/lib/DateTime/Event/ICal.pm

part of the latest datetime.perl.org project

Flavio Soibelmann (also author of Date::Set, which became Date Time?::Set)

Net::vFile http://search.cpan.org/~jlawrenc/Net-vCard-0.5/lib/Net/vFile.pm

vCard and vCalendar

Text::vFile

does not expand RRULE. does not support nested structures.
same author as Net::vFile; no work since 2003.
no writing

Date::ICal http://search.cpan.org/~rbow/Date-ICal-1.72/

by Rich Bowen and the Reefknot team
parses either ISO8601 or an ical duration
no recurrence

Net::ICal http://search.cpan.org/~srl/Net-ICal-0.15/lib/Net/ICal.pm

no work since 2001; never finished.

also part of reefknot
supports rrule etc. at least in Net::ICal::Journal

http://search.cpan.org/~srl/Net-ICal-0.15/lib/Net/ICal/Journal.pm
which creates Net::ICal::Recurrence

Text::vFile::asData

does not expand RRULE. does support nested structures. does not unescape \,

Date::Set http://search.cpan.org/~fglock/Date-Set-1.30/lib/Date/Set.pm

can combine multiple dates.
has internal support for Date::Set::ICal
also part of reefknot
supplanted by

http://search.cpan.org/~fglock/DateTime-Set-0.17/lib/DateTime/Set.pm

iCal::Parser::HTML

uses iCal::Parser::SAX uses iCal::Parser uses Text::vFile::asData and Date Time?::Format::ICal

iCal::Parser uses Text::vFile::asData.

It does expand RRULE, using Date Time?::Format::ICal->new()->parse_recurrence
It also expands events spanning multiple days into individual events.

Data::ICal

Artistic license. by Jesse Vincent, David Glasser, Simon Wistow
uses Text::vFile::asData to parse.
does its own writing.

=head1 Open Source Native Clients

Rainlendar http://www.rainlendar.net/ http://www.ipi.fi/~rainy/index.php?pn=projects&project=rainlendar

Windows only client
server runs windows or linux
its own protocol not caldav. uses

http://ssobjects.sourceforge.net/
GPL C++

Chandler

Mozilla Sunbird (win32, osx, linux)

http://www.mozilla.org/projects/calendar/sunbird_download.html
only does webdav, not RFC protocol (as implemented by Sun)

Evolution http://www.novell.com/products/desktop/features/evolution.html (osx, linux)

Evolution Calendar “based on” Gnome Cal?, gnome calendar part of evolution

worked on by “Frederico”
Russell Steinthal rms39@columbia.edu interested in it

http://www.softwarestudio.org/non-vc/MailArchives/libical/0165.html

was:

http://www.helixcode.com/apps/evolution.php3

http://primates.helixcode.com/~miguel/activity-log.html

KOrganizer http://korganizer.kde.org/ (win32, osx, linux)

does vcalendar

http://devel-home.kde.org/~korganiz/development.html#architecture

Kalendar

no client-server, vcalendar, etc.

http://www.gnome.org/users-guide/gcal.html

uses icalendar

http://www.gnome.org/mailing-lists/archives/calendar-list/
gnome-pim works with it?

=head2 Commercial Calendar Clients

30boxes.com

web-based ajax editing
supports ics export

Yahoo Calendar calendar.yahoo.com

will take yahoo CSV export to produce ical:

http://www.manastungare.com/projects/yahoo2ical/

Microsoft Outlook

has problems:

http://sippey.typepad.com/filtered/2004/02/ical_and_outloo.html

http://www.rockinsoftware.com/WinDates.aspx

shareware, now withdrawn

http://www.even-t.com/even-t.html

Corporate Time? http://www.cst.ca/ -> www.steltor.com -> Oracle

enterprise calendaring and resource scheduling

has linux support
spun out lexacom then brought it back in
had some of the original tech in Netscape CS?
on icalendar committee
Lexacom / Corporate? Software and Technologies (CS&T)
montreal canada

=head1 Web-Based Clients

lists and reviews:

http://planscalendar.com/index.php?p=competition

http://www.machineofthemonth.org/articles/2003/0324/index.html

http://courses.washington.edu/~hs590a/modules/23/webcalendars.html

http://www.mg.co.za/mg/pc/9904/21apr-webcalendar.htm

software: PHP iCalendar

home=

http://phpicalendar.sourceforge.net/nuke/
home=

http://phpicalendar.sourceforge.net/phpicalendar-0.9.4/day.php
home=

http://sourceforge.net/projects/phpicalendar
language=php
license=GPL
description=<<EOF

example use at http://calendar.resist.ca/month.php
no editing, just presents a .ics file
demo at http://phpicalendar.net/phpicalendar/
parser is limited: doesn't even deal with escapes!
fork to support booking, at http://www.nanofab.ualberta.ca/iCalDemo

discussion at

http://phpicalendar.net/forums/archive/index.php/t-1126.html

http://www.nanofab.ualberta.ca/phpiCalDistro.zip

EOF

Monket Calendar http://www.monket.net/wiki/monket-calendar/

GPL/CC dual license
php + ajax
author taking a break

“UW Calendar” http://www.washington.edu/ucal/

bsd license. java xml xslt.
implements caldav
ambitious
currently no recurring support
looks good; see:

http://events.rpi.edu/showMain.rdo;jsessionid=EDB0054633915C25C6890443A7A13106
and

http://berlin.ucs.mun.ca/java/cal/

http://planscalendar.com/

perl GPL
demo at

http://planscalendar.com/demo/
has web-based create.
decent look.
themes, translations, plugins
some recurring support.
has export to vCalendar not to iCal
will import an ics file:

http://www.planscalendar.com/forum/viewtopic.php?t=1091
but not yet modify an ics:

http://www.planscalendar.com/forum/viewtopic.php?t=612
stores data in flat files or in database
some massive perl files with intermixed html, etc.
has its own parser

iCal::Parser::HTML

Perl license. demo?

includes ical.cgi that is a cgi for displaying ics files

http://cpan.uwinnipeg.ca/htdocs/iCal-Parser-HTML/README.html

http://jwebcalendar.sourceforge.net

java. uses xslt and javascript.
seems dead

http://dev.neb.net/phpMyCal/

works with phpicalendar, gets ics out of mysql
no updates since 2004

webcalendar.sf.net = http://www.k5n.us/webcalendar.php

php GPL. uses mysql.
has web editing

exports to iCalendar or vCalendar

demo at

http://www.k5n.us/opensource/month.php
can act as a “calendar server” for Mozilla Sunbird or Apple iCal.

a fork is used by pgw.
exports iCal
lists others at

http://www.k5n.us/webcalendar.php?topic=Competitors

Web Calendar? http://www.math.utexas.edu/users/mzou/WebCalendar.html

mod_perl GPL
has translations to many languages
not that great looking ui by default
has a “calendar server” (its own http post mechanism)
“drag and drop editing”
supports vcs files (not ics?)

extcal http://sourceforge.net/projects/extcal

php GPL mysql
no iCal?
demo at

http://www.maroctour.com/cal/calendar.php
looks great

has web-based create
formerly EXTcalendar

http://www.realize.be/swentel/module.php?boxcontent=5&boxid=4

http://sourceforge.net/projects/iwebcal/

now commercial service (2003)

php GPL
from

http://www.designtheworld.com/iwebcal/

http://sourceforge.net/projects/myxcal

perl GPL
uses xCal XML and XSLT
nothing since 2003

http://myphpcalendar.sourceforge.net/