nsIRDFDataSource *aDataSource; if (!JS_ConvertArguments(cx, argc, argv, "o", &aDataSource))
JSObject* jsaDataSource; if (!JS_ConvertArguments(cx, argc, argv, "o", &jsaDataSource))
nsIRDFService_UnregisterDataSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){  nsIRDFService *priv = (nsIRDFService *)JS_GetPrivate(cx, obj);  if (!priv)    return JS_TRUE;  nsIRDFDataSource *aDataSource;  if (!JS_ConvertArguments(cx, argc, argv, "o", &aDataSource))    return JS_FALSE;  nsresult rv = priv->UnregisterDataSource(aDataSource);  if (NS_FAILED(rv)) {    JS_ReportError(cx, XXXnsresult2string(rv));    return JS_FALSE;  }  return JS_TRUE;}