Hi Michael,
to show different types in a table you can use <table> and <tabletype>. There are also <matrix> and <cellTable>, which might solve your problem in a better way.
Here is a little example for a small table with two columns and two types:
XML-File
----------
<table content="getPersonList" contentType="Person">...
2009-02-12 08:42:24 UTC in gui4j
