@Override
protected void buildXHTML(XHTMLContentHandler xhtml) throws SAXException,
XmlException, IOException {
OPCPackage container = extractor.getPackage();
ReadOnlySharedStringsTable strings;
XSSFReader.SheetIterator iter;
XSSFReader xssfReader;
StylesTable styles;
try {
xssfReader = new XSSFReader(container);
styles = xssfReader.getStylesTable();
iter = (XSSFReader.SheetIterator) xssfReader.getSheetsData();
strings = new ReadOnlySharedStringsTable(container);
} catch(InvalidFormatException e) {
throw new XmlException(e);
} catch (OpenXML4JException oe) {
throw new XmlException(oe);
}