Ticket #578 (defect)

A request like:

<?xml version='1.0' encoding='UTF-8'?>
<calendar-query xmlns='urn:ietf:params:xml:ns:caldav'>
<prop xmlns='DAV:'>
<getetag/>
<calendar-data xmlns='urn:ietf:params:xml:ns:caldav'>
<comp name='VCALENDAR'>
<allprop/>
<comp name='VEVENT'>
<prop name='X-ABC-GUID'/>
<prop name='UID'/>
<prop name='DTSTART'/>
<prop name='DTEND'/>
<prop name='DURATION'/>
<prop name='EXDATE'/>
<prop name='EXRULE'/>
<prop name='RDATE'/>
<prop name='RRULE'/>
<prop name='LOCATION'/>
<prop name='SUMMARY'/>
<prop name='DESCRIPTION'/>
<prop name='CATEGORIES'/>
</comp>
<comp name='VTIMEZONE'>
<allprop/>
<allcomp/>
</comp>
</comp>
</calendar-data>
</prop>
<filter>
<comp-filter name='VCALENDAR'>
<comp-filter name='VEVENT'>
<time-range start='20051219T000000Z' end='20061209T000000Z'/>
<prop-filter name='CATEGORIES'>
<text-match>cool</text-match>
</prop-filter>
</comp-filter>
</comp-filter>
</filter>
</calendar-query>