@Override
public Plan create(Query query, DatasetGraph dsg, Binding inputBinding, Context context) {
if ( !( dsg instanceof DatasetGraphWrapper ) )
return null ;
DatasetGraph dsg2 = ((DatasetGraphWrapper)dsg).getWrapped() ;
return QueryEngineRegistry.findFactory(query, dsg2, context).create(query, dsg2, inputBinding, context) ;
}