add:   aCalendar.addObserver(this.mObserverHelper); 
context:     addCalendar: function (aCalendar) {        // check if the calendar already exists        for each (cal in this.mCalendars) {            if (aCalendar.uri.equals(cal.uri)) {                // throw exception if calendar already exists?                return;            }        }        this.mCalendars.push(aCalendar);        this.observeCalendarAdded(aCalendar);        // if we have no default calendar, we need one here        if (this.mDefaultCalendar == null) {            this.mDefaultCalendar = aCalendar;            this.observeDefaultCalendarChanged(aCalendar);        }    },
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/80dc8823a79814b2758b11a5100f139f84021eef/calCompositeCalendar.js/buggy/calendar/providers/composite/calCompositeCalendar.js