{
if ( dataset.asDatasetGraph() instanceof GraphStore )
return (GraphStore)(dataset.asDatasetGraph()) ;
// if ( ( dataset instanceof DatasetImpl ) || (dataset instanceof DataSourceImpl ) )
// return new GraphStoreBasic(dataset) ;
return new GraphStoreBasic(dataset.asDatasetGraph()) ;
//throw new UpdateException("Can't create a GraphStore for dataset: "+dataset) ;
}