add: if (!(item instanceof Components.interfaces.calIEvent)) return;  
context: function observer_onAddItem(item){    var occs = item.getOccurrencesBetween(this.agendaTreeView.today.start,                                          this.agendaTreeView.soon.end, {});    occs.forEach(this.agendaTreeView.addItem, this.agendaTreeView);    this.agendaTreeView.rebuildAgendaView();};
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/3f7875d176f49ef9d223892a8d2dbc925080d32b/agenda-tree.js/clean/calendar/lightning/content/agenda-tree.js