Applying the RDF iCalendar schema to recurring weekly schedule events

$Id: iCal-proposal.html,v 1.3 2003/02/11 14:17:51 graham Exp $  

(This information has been prepared jointly by Ronan Klyne and myself.)

The work so far

The existing schema at http://www.w3.org/2002/12/cal/ical defines the following classes and properties:

• Vcalendar
  • calscale
  • prodid
  • version
  • prod_apple#wrTimezone
• Vevent
  • attendee
  • categories
  • class
  • description
  • dtend
  • dtstamp
  • dtstart
  • location
  • organiser
  • rrule
  • sequence
  • summary
  • transp
  • uid
  • valarm
• Vtimezone
  • daylight
  • standard
  • tzid
  • prod_evo#licLocation

Not defined, but present (with different spelling) in the hybrid schema are:

• Vtimeentry (common date/time value superclass)
  • Vdatetime (subclasses)
  • Vdate
• Vrecur (class to describe a recurring event )

There is nothing in the new schema to relate a Vcalendar to a Vevent (ala VEVENT-PROP in the hybrid schema).

There is nothing in the new schema to represent a time without a date.

Our proposal

We propose to use:

Vtimeentry - superclass for all date and/or time values

• Vdatetime - class for date+time values ("yyyymmddThhmmss")
• Vdate - class for date values ("yyyymmdd")
• Vtime - class for time values ("Thhmmss")
• Vrecur - class for a recurrence rule, to be described with properties freq, interval, etc.
• hasEvent - property relating Vevent to a VCalendar

The sample data Users.n3 uses the following ical vocabulary (look to the end of the file for schedule details):

• Vcalendar
  • hasEvent
• Vevent
  • dtstart
  • dtend
  • rrule
• Vtime
  • rdf:value
• Vrecur
  • freq
  • interval
  • byday

In keeping with the original hybrid scheme data, this test data uses rdf:value to designate date/time literal strings. Is this a good idea, givem the semantic uncertainty surrounding this property?

Revision history

$Log: iCal-proposal.html,v $
Revision 1.3  2003/02/11 14:17:51  graham
Add links to hybrid schema.

Revision 1.2  2003/02/11 14:12:01  graham
Note that calendar related data is at the end of Users.n3

Revision 1.1  2003/02/11 14:04:01  graham
Add calendaring notes
Add updated iCalendar schema proposals