code: public List<String> process() throws IOException, OpenXML4JException, ParserConfigurationException, SAXException {
  		ReadOnlySharedStringsTable strings = new ReadOnlySharedStringsTable(this.xlsxPackage);
  		XSSFReader xssfReader = new XSSFReader(this.xlsxPackage);
  		StylesTable styles = xssfReader.getStylesTable();
  		XSSFReader.SheetIterator iter = (XSSFReader.SheetIterator) xssfReader.getSheetsData();
  		int index = 0;
  		while (iter.hasNext()) {
  			if(blankRowNum == 10)break;
  			InputStream stream = iter.next();
  			String sheetName = iter.getSheetName();
  			results.add(ExcelValidator.SHEET_NAME_PREFIX + sheetName);
  			processSheet(styles, strings, new SheetToCSV(), stream);
  			stream.close();
  			++index;
  		}
  
  		return results;
  	}
docs: Initiates the processing of the XLS workbook file to CSV.
  
  @throws IOException
  @throws OpenXML4JException
  @throws ParserConfigurationException
  @throws SAXException