private static function readXmlPageKeywords(\Gettext\Translations $translations, $filenameRel, \DOMNode $node, $pageUrl)
    {
        $keywords = (string) $node->nodeValue;
        if ($keywords !== '') {
            $translation = $translations->insert('', $keywords);
            $translation->addReference($filenameRel, $node->getLineNo());
            $pageUrl = (string) $pageUrl;
            if ($pageUrl !== '') {
                $translation->addExtractedComment("Keywords for page $pageUrl");
            }
        }
    }