public static function getTypeValuesHTML()
 {
     global $REX;
     $return = [];
     /**
      * prepare Opengraph from MetaInfo TypeValues
      */
     if (self::$curArticle->getValue('art_open_graph_typevalues')) {
         $typeValues = explode("\n", self::$curArticle->getValue('art_open_graph_typevalues'));
         foreach ($typeValues as $typeValue) {
             $typeValue = explode('|', $typeValue);
             $return[] = '<meta property="' . trim($typeValue[0]) . '" content="' . trim($typeValue[1]) . '">';
         }
     }
     return implode("\n\t", $return) . "\n\t";
 }