nested structures

[Vardar, Tuna]

hi.

how can I handle nested structures using Struts?
what I want to do is sth. like :

<ul>
<logic:iterate id="item1" name="coll1">
    <li><bean:write name="item1" property="pro1"><li>
           <ul>
               <!--a check here if coll2.pro2 = coll1.pro1  ??? -->
               <logic:iterate id="item2" name="coll2">
                <li><bean:write name="item2" property="pro3"></li>
           </logic:iterate>
           </ul>
</logic:iterate>
</ul>

I tried some combinations but couldn't succeeded.
any comments?