NodeList lst = contentDom.getElementsByTagNameNS(
OfficeSpreadsheetElement.ELEMENT_NAME.getUri(),
OfficeSpreadsheetElement.ELEMENT_NAME.getLocalName());
OfficeSpreadsheetElement sheet = (OfficeSpreadsheetElement) lst.item(lst.getLength() - 1);
TableTableElement table = sheet.newTableTableElement();
//table.setOdfAttribute( OdfName.newName( OdfNamespace.newName(OdfDocumentNamespace.TABLE), "name" ), "newtable" );
//table.setOdfAttribute( OdfName.newName( OdfNamespace.newName(OdfDocumentNamespace.TABLE), "style-name" ), "ta1" );
table.setTableNameAttribute("newtable");
table.setTableStyleNameAttribute("ta1");
TableTableColumnElement column = table.newTableTableColumnElement();