{volist name="menu" id="a"}
• {$a.title} {if $a.child ?? ''}

  {volist name="$a.child" id="b" key="k"} {if $b.type ==3}

  {$b.title}

  {else /}

  {$b.title}

  {volist name=":$b.child ?? '' " id="c"}

  {$c.title}

  {/volist}

  {/if} {/volist}

  {/if}
{/volist}