I'd go with icalendar. It plays nicely with most major calendar applications.

also, at the risk of sounding like a shill, I'm helping develop a web
app (www.fusecal.com) that'll make it easier for web publishers to get
their calendar information into users personal calendars and keep the
information up to date as the calendar changes.

to see how it works, check out http://www.as220.org/calendar.html and
click on the green FuseCal button on the left. from there you can
subscribe to events on that webpage and sync the subscription with
your personal calendar app.

On Wed, Sep 17, 2008 at 4:30 PM, Jonathan Rochkind <[log in to unmask]> wrote:
> http://en.wikipedia.org/wiki/ICalendar
> http://en.wikipedia.org/wiki/CalDAV
>
> wally grotophorst wrote:
>>
>> calDev?
>>
>> -- wally
>>
>> Wally Grotophorst
>> Associate University Librarian
>> Digital Programs and Systems
>> University Libraries
>> George Mason University
>> Fairfax, Virginia 22030
>> (703) 993-9005
>>
>>
>> Cloutman, David wrote:
>>>
>>> Does anyone have a recommend standard XML format for the exchange of
>>> calendar information, preferably something with a W3C standard? We want
>>> to be able to publish data from our content management system in a
>>> format that other calendars in our community could scoop up.
>>>
>>> Thanks,
>>>
>>> - David
>>>
>>>
>>>
>>> ---
>>> David Cloutman <[log in to unmask]>
>>> Electronic Services Librarian
>>> Marin County Free Library
>>> Email Disclaimer: http://www.co.marin.ca.us/nav/misc/EmailDisclaimer.cfm
>>>
>>
>
> --
> Jonathan Rochkind
> Digital Services Software Engineer
> The Sheridan Libraries
> Johns Hopkins University
> 410.516.8886 rochkind (at) jhu.edu
>