I spent most of yesterday working with
Mike’s new, very much improved schemas. You will see that for
all objects, they are no cleaner.
Last week, I raised the issue of using the
proper object for the proper purpose. We had fallen into using
a “0 duration Interval” to announce state changes, as if the
rest ofg the vobjects never existed. Of course, the
<xcal:vevent
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xcal="urn:ietf:params:xml:ns:icalendar-2.0">
<xcal:properties>
<xcal:uid>
<xcal:text>a57e3fc7-2b27-4b70-96b0-b7ff6f4056e1</xcal:text>
</xcal:uid>
<xcal:dtstart>
<xcal:parameters>
<xcal:tzid>
<xcal:text>America/New_York</xcal:text>
</xcal:tzid>
</xcal:parameters>
<xcal:date-time>2011-05-28T16:15:00</xcal:date-time>
</xcal:dtstart>
</xcal:properties>
<xcal:components/>
</xcal:vevent>
ICalendar already has the vtodo (which we
initially modeled the interval on) which is driven by the End
Date, that is, if it has one of the three (Duration, Start,
End), it has End
<xcal:vtodo
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xcal="urn:ietf:params:xml:ns:icalendar-2.0">
<xcal:properties>
<xcal:uid>
<xcal:text>30ca1940-a79b-4d22-841d-751e81fb99e8</xcal:text>
</xcal:uid>
<xcal:dtend>
<xcal:parameters>
<xcal:tzid>
<xcal:text>America/New_York</xcal:text>
</xcal:tzid>
</xcal:parameters>
<xcal:date-time>2011-05-28T16:15:00</xcal:date-time>
</xcal:dtend>
</xcal:properties>
<xcal:components/>
</xcal:vtodo>
ICalendar already has the valarm which is
driven by the Start Date, that is, if it has one of the three
(Duration, Start, End), it has Start
<xcal:valarm
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xcal="urn:ietf:params:xml:ns:icalendar-2.0">
<xcal:properties>
<xcal:uid>
<xcal:text>c437be23-d744-498d-b0f2-5ea888f154f5</xcal:text>
</xcal:uid>
<xcal:dtstart>
<xcal:parameters>
<xcal:tzid>
<xcal:text>America/New_York</xcal:text>
</xcal:tzid>
</xcal:parameters>
<xcal:date-time>2011-05-28T16:15:00</xcal:date-time>
</xcal:dtstart>
</xcal:properties>
</xcal:valarm>
I see no reason why we shouldn’t use the
valarm for state changes and for price announcement s with
indefinite changes… Valarm has the added charm of already
including concepts as “when this happens, start playing
selected music 5 minutes in advance…”
tc
“The single biggest problem in
communication is the illusion that it has taken place.”
– George Bernard Shaw.