public function metaKeywords()
    {
        $metaKeywords = $this->getMetaKeywords();

        if (!$metaKeywords && $type = $this->getType()) {
            $metaKeywords = $type->getMetaKeywords();
        }

        if (!$metaKeywords) {
            $metaKeywords = $this->getTags();
        }

        return $metaKeywords;
    }