Struts <logic:equal>

[Jeroen]

I'm writing a forum using Struts, but i ran into a problem while using
the <logic:equal> tag.
The idea is to iterate over two collection (Categories and Forums) and
based on the Category id show the matching Forums. The problem is that
i'm not able to find the value to use in:
<logic:equal name="forum" property="categoryId" value="">
I was expecting something like category.id but this doesn't work.

<logicresent name="<%=SessionLabels.CATEGORIES%>">
<logic:iterate id="category" name="<%=SessionLabels.CATEGORIES%>">
<bean:write name="category" property="id"/>
<logicresent name="<%=SessionLabels.FORUMS%>">
<logic:iterate id="forum" name="<%=SessionLabels.FORUMS%>">
<!-- Here's the problem, what value to use!!-->
<logic:equal name="forum" property="categoryId" value="">
<bean:write name="forum" property="name"/>
</logic:equal>
</logic:iterate>
</logicresent>
</logic:iterate>
</logicresent>