rem: var occ = Components.classes["@mozilla.org/calendar/item-occurrence;1"]. createInstance(calIItemOccurrence); occ.initialize(item, start, end); 
add: var occ = item.createProxy(); occ.recurrenceId = start; occ.startDate = start; occ.endDate = end; 
context: function makeOccurrence(item, start, end){    var occ = Components.classes["@mozilla.org/calendar/item-occurrence;1"].        createInstance(calIItemOccurrence);    occ.initialize(item, start, end);    return occ;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/280f5745e11c456b8a13d45f281bf24fae621bd0/calDavCalendar.js/buggy/calendar/providers/caldav/calDavCalendar.js