Event calendar aggregation - XML RSS?

How best to agreggate several special event calendars

[brycen]

Assume I want to create a master event calendar, showing all the events of a dozen sub-chapters of a club. Let's say it's an outdoor club with a hiking, biking, canoeing subchapters and I also want to publish a single all-inclusive list.

Is there an XML schema available, similar perhaps to RSS, which I could use? How can multiple independent organizations share or aggregate calendar data?

<ical version="0.001">
<event>
<title>Rail Trail Benefit</title>
<link>http://railtrails.org</link>
<description>Fake event to benefit creation of trails from old railroad lines.</description>
<date>February 10, 2004</date>
<time>5pm-7pm</time>
<repeat>no</repeat>
<source>http://railtrails.org/icalfeed/</source>
</event>
</ical>

[uncle_bob]

Recently did just this, client wanted multiple seperate calendars, but still wanted to see the aggregate of all events.

Used phpCalendar on the web, as it lets you choose an individual cal file, or show a combined calendar of all files.

Used Mozilla Calendar plugin on the desktop, to allow easy editing of calendars, viewing single or multiple calendars at once, and shared publishing using webdav to the phpCalendar directory.

Hey presto - joined up scheduling!