public function getMetaKeywords()
    {
        if ($this->_sMetaKeywords === null) {
            $this->_sMetaKeywords = false;

            // set special meta keywords ?
            if (($keywords = $this->_getMetaFromSeo('oxkeywords'))) {
                $this->_sMetaKeywords = $keywords;
            } elseif (($keywords = $this->_getMetaFromContent($this->_sMetaKeywordsIdent))) {
                $this->_sMetaKeywords = $this->_prepareMetaKeyword($keywords, false);
            } else {
                $this->_sMetaKeywords = $this->_prepareMetaKeyword(false, true);
            }
        }

        return $this->_sMetaKeywords;
    }