<?php namespace PhpOffice\PhpSpreadsheet\Writer\Ods;< use PhpOffice\PhpSpreadsheet\Spreadsheet; <class Mimetype extends WriterPart { /** * Write mimetype to plain text format. *< * @param Spreadsheet $spreadsheet < ** @return string XML Output */< public function write(Spreadsheet $spreadsheet = null)> public function write(): string{ return 'application/vnd.oasis.opendocument.spreadsheet'; } }