DOCBOOK-APPS: Using Fop to create PDF file

Hi,

I have two user guides in DocBook XML format: one containing 50 pages, the 
other about 400 pages. I use Norman XSL to produce HTML and Windows help 
file doc. Everything works fine. Now, I want to produce PDF version of this 
manuals. For the small one, it works. For the big one, I get an OutOfMemory 
error from FOP. I try to tweak java memory usage without success. Is 
someone doing such a job on large file using FOP? Is there another way to 
transform a FO file to PDF working.

Thanks.

Fr嶮廨ic Demians