Multiple output files with multiple data

I have to create different output files based 
on the same source file but, differently 
from the Step 4 on the quick tour, what 
changes is that I have multiple data sources 
(multiple xml files).
Each xml file has the same schema.
How can I get different outputs from different data sources?

(I've already posted to the SourceForge.net Web forum: where is
the best place to ask for informations?)



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