private function writeDefaultContentType(XMLWriter $objWriter, $pPartname = '', $pContentType = '') { if ($pPartname == '' || $pContentType == '') { throw new \Exception("Invalid parameters passed."); } // Write content type $objWriter->startElement('Default'); $objWriter->writeAttribute('Extension', $pPartname); $objWriter->writeAttribute('ContentType', $pContentType); $objWriter->endElement(); }