rem: !aIID.equals(Components.interfaces.calIMutableItemBase)) 
add: !aIID.equals(Components.interfaces.calIItemOccurrence)) 
context:     QueryInterface: function (aIID) {        if (!aIID.equals(Components.interfaces.nsISupports) &&            !aIID.equals(Components.interfaces.calIMutableItemBase))        {            throw Components.results.NS_ERROR_NO_INTERFACE;        }        return this;    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/df6666d51264e4b2ef1ad6691955dac2b27ba05a/calItemBase.js/clean/calendar/base/src/calItemBase.js