{volist name='menu_info' id='vo'}

{$vo.name}

{empty name="$vo.child"}
{else/} {volist name="$vo.child" id='ch'}

{$ch.name}

{empty name="$ch.child"}
{else/}

{volist name="$ch.child" id='ac'} {$ac.name} {/volist}

{/empty}

{/volist} {/empty}

{/volist}