How to merge xml files present in folder into one xml

Hi All,

I have to merge xml files into one xml file present in folder.

Say in folder "test1" -- there are five xml files. (here I need to merge
into one xml file) 
                   "test2"--- there are six xml files. (here I need to merge
into one xml file) 

Final output is two merge xml files with respective foldernames. This I have
to do using XSL + ANT + Java.

Can anyone help me for the same.


Thanks,
Shailesh