Example 1 is in text/calendar format, and example 2 is in text/xml output.
Example 1
http://calendarserver/verifyevents_by_ids.wcap
?id=$n3o2m05sx9v6t98t8u2p
&calid=jdoe
&uid=3bd9e72f000027cf0000000600002113;
3bd9e717000045030000000100002113;
3bd9e717000045030000000100002113;
3bd9cd4700002206000000010000202d
&rid=0;20021027T230000Z;20021026T230000Z;0
&fmt-out=text/calendar
BEGIN:VCALENDAR
PRODID:-//SunONE/Calendar Hosting Server//EN
VERSION:6.0
BEGIN:VEVENT
UID:3bd9e717000045030000000100002113
RECURRENCE-ID:20021027T230000Z
END:VEVENT
BEGIN:VEVENT
UID:3bd9cd4700002206000000010000202d
END:VEVENT
END:VCALENDAR
Example 2
http://calendarserver/verifyevents_by_ids.wcap
?id=$n3o2m05sx9v6t98t8u2p
&calid=savri
&uid=3bd9e72f000027cf0000000600002113;
3bd9e717000045030000000100002113;
3bd9e717000045030000000100002113;
3bd9cd4700002206000000010000202d
&rid=0;20021027T230000Z;20021026T230000Z;0
&fmt-out=text/xml
<?xml version="1.0" encoding="UTF-8"?\> <iCalendar\> <iCal version="6.0" prodid="-//SunONE/Calendar Hosting Server//EN"\> <EVENT\> <UID\>3bd9e717000045030000000100002113</UID\> <RECURID\>20021027T230000Z</RECURID\> </EVENT\> <EVENT\> <UID\>3bd9cd4700002206000000010000202d</UID\> </EVENT\> </iCal\> </iCalendar\>