protected function export_header(workshop_submission $workshopsubmission) {

        $output = '';
        $output .= html_writer::tag('h2', get_string('pluginname', 'mod_workshop').': '.s($this->workshop->name));
        $output .= html_writer::tag('h3', s($workshopsubmission->title));

        $created = get_string('userdatecreated', 'workshop', userdate($workshopsubmission->timecreated));
        $created = html_writer::tag('span', $created);

        if ($workshopsubmission->timemodified > $workshopsubmission->timecreated) {
            $modified = get_string('userdatemodified', 'workshop', userdate($workshopsubmission->timemodified));
            $modified = ' | ' . html_writer::tag('span', $modified);
        } else {
            $modified = '';
        }

        $output .= html_writer::div($created.$modified);
        $output .= html_writer::empty_tag('br');

        return $output;
    }