private function writeFonts($objWriter, $latinFont, $fontSet)
    {
        // a:latin
        $objWriter->startElement('a:latin');
        $objWriter->writeAttribute('typeface', $latinFont);
        $objWriter->endElement();

        // a:ea
        $objWriter->startElement('a:ea');
        $objWriter->writeAttribute('typeface', '');
        $objWriter->endElement();

        // a:cs
        $objWriter->startElement('a:cs');
        $objWriter->writeAttribute('typeface', '');
        $objWriter->endElement();

        foreach ($fontSet as $fontScript => $typeface) {
            $objWriter->startElement('a:font');
                $objWriter->writeAttribute('script', $fontScript);
                $objWriter->writeAttribute('typeface', $typeface);
            $objWriter->endElement();
        }
    }