nsIRDFXMLSinkObserver* obs = (nsIRDFXMLSinkObserver*) mObservers[i]; obs->OnResume(this);
nsCOMPtr<nsIRDFXMLSinkObserver> obs = mObservers[i];  if (obs) { obs->OnResume(this); }
RDFXMLDataSourceImpl::Resume(void){    for (PRInt32 i = mObservers.Count() - 1; i >= 0; --i) {        nsIRDFXMLSinkObserver* obs = (nsIRDFXMLSinkObserver*) mObservers[i];        obs->OnResume(this);    }    return NS_OK;}