final SpreadsheetBuilder spreadsheetBuilder = new SpreadsheetBuilder( ComputationMode.EXCEL );
loadConfig( xlsWorkbook );
for (final jxl.Sheet xlsSheet : xlsWorkbook.getSheets()) {
final SheetBuilder sheetBuilder = spreadsheetBuilder.beginSheet( xlsSheet.getName() );
loadRows( xlsSheet, sheetBuilder );
sheetBuilder.endSheet();
}
final BaseSpreadsheet workbook = spreadsheetBuilder.getSpreadsheet();