[Ietf-calsify] RDATE Question was (rfc 2445 - recurrence set,
gsexton at mhsoftware.com
Tue May 30 07:24:50 PDT 2006
The wording for RDATE and EXDATE is very similar and it's raised a
question in my mind.
Is it required to have a DTSTART entry for RDATE events? In otherwords,
if I have 3 events
May 1, May 5, and May 7
Should it be:
The reason I'm asking is the purpose in 184.108.40.206 states:
Purpose: This property defines the list of date/times for a recurrence set.
"the" seems to say it is sufficient by itself, while the description (as
in EXDATE) references "the initial "DTSTART"" property.
Andrew N Dowden wrote:
> 220.127.116.11 Exception Date/Times (EXDATE)
> .. The recurrence set is the complete set of
> recurrence instances for a calendar component. 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. The "DTSTART" property defines the first
> instance in the recurrence set. Multiple instances of the "RRULE" and
> "EXRULE" properties can also be specified to define more
> sophisticated recurrence sets. The final recurrence set is generated
> by gathering all of the start date-times generated by any of the
> specified "RRULE" and "RDATE" properties, and then excluding any
> start date and times which fall within the union of start date and
> times generated by any specified "EXRULE" and "EXDATE" properties.
> This implies that start date and times within exclusion related
> properties (i.e., "EXDATE" and "EXRULE") take precedence over those
> specified by inclusion properties (i.e., "RDATE" and "RRULE"). Where
> duplicate instances are generated by the "RRULE" and "RDATE"
> properties, only one recurrence is considered. Duplicate instances
> are ignored.
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