게시판 리스트 상단에서 확장변수값 출력하기

{@
$oDocumentModel = &getModel('document');
$getExtraKeys = $oDocumentModel->getExtraKeys($oDocument->get('module_srl'));
}
<!--@foreach($getExtraKeys as $keys)-->
<!--@foreach($keys as $key => $val)-->
{$key} : {$val}

<!--@endforeach-->
<!--@endforeach-->

ㅠㅠ

참조 

https://xe1.xpressengine.com/tip/17851266

https://xe1.xpressengine.com/tip/18419501