rem: get propertyEnumerator() { return this.mProperties.enumerator; }, 
add: get previous() { if (this.item.recurrenceInfo) return this.item.recurrenceInfo.getPreviousOccurrence(this.item, aStartDate); return null; } 
context:     get propertyEnumerator() { return this.mProperties.enumerator; },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/c77a324d89eb0554304c92e9b1711ed879d16a00/calItemBase.js/buggy/calendar/base/src/calItemBase.js