{eyou:channel type="first"} 
<h2>{$field.typename}</h2>
{eyou:notempty name="$field.children"}
<ul>
{eyou:channel name="$field.children" id="field2"}
<li>
<a href="{$field2.typeurl}">{$field2.typename}</a>
{eyou:arclist typeid='$field2.typeid' titlelen='20' id="field3"}
<a href="{$field3.arcurl}">{$field3.title}</a>
{/eyou:arclist}    						
</li>
{/eyou:channel}
</ul>
{/eyou:notempty} 
{/eyou:channel}