#my hack to only return the list of sheet names
    if($self->{just_find_sheet_names}) {
      my @sheets = map {
        $_->att('name');
      } $files->{workbook}->find_nodes('//s:sheets/s:sheet');
      $workbook->{Worksheet}  = \@sheets;
      $workbook->{SheetCount} = scalar(@sheets);
      return $workbook;
    }