[ietf-caldav] Question about recurring tasks.

[Bernard Desruisseaux]

Hi Daniel,

In section 4.8.5.4 Recurrence Rule of RFC 2445 it says:

 > The recurrence set is generated by considering the initial "DTSTART"
 > property along with the "RRULE", "RDATE", "EXDATE" and "EXRULE"
 > properties contained within the iCalendar object.

As such, the "DTSTART" should always be specified in a calendar 
component that also specify the "RRULE" property.

That being said, this should probably be stated more clearly in rfc2445bis.

To be very clear, in iCalendar recurrence instances of a recurring 
"VTODO" are not computed based on the "DUE" property of the master 
component.

So to answer your question, a strict implementation should handle a 
recurring task with no "DTSTART" as an invalid "VTODO" component, and a 
relax implementation could probably fix the invalid "VTODO" component by 
adding the missing "DTSTART" property with the same value as "DUE".

Cheers,
Bernard

Daniel Gomez Brito wrote:
> Hello:
> 
>  
> 
> What’s the proper way to treat a recurring task with no dtstart property?
> 
> It doesn’t make sense to me but it seems there’s a bunch of portable 
> devices that let you build something like this:
> 
>  
> 
> BEGIN:VCALENDAR
> 
> VERSION:2.0
> 
> PRODID:-//Test//Ver 1.0.0 //ES
> 
> BEGIN:VTODO
> 
> SUMMARY:cxcx
> 
> DESCRIPTION:xcx
> 
> CATEGORIES:
> 
> CLASS:PUBLIC
> 
> DUE;VALUE=DATE:20081030
> 
> PRIORITY:5
> 
> ORGANIZER:
> 
> PERCENT-COMPLETE:0
> 
> STATUS:NEEDS-ACTION
> 
> RRULE:FREQ=WEEKLY;INTERVAL=1;BYDAY=TH
> 
> X-FUNAMBOL-FOLDER:DEFAULT_FOLDER
> 
> X-FUNAMBOL-ALLDAY:1
> 
> UID:20081028T082036Z-2
> 
> DTSTAMP:20081028T082035Z
> 
> END:VTODO
> 
> END:VCALENDAR
> 
>  
> 
> Regards.
> 
>  
> 
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