trasformation of a Word Document

Hi,
this is my problem.
My client create a general letter with some "dinamic" fields inside the
document using Microsoft word and I need to find out the FO structure to
ricreate after a PDF file.
The creation of the PDF file is done by a feature of a software product
developed with Java.
I know that with word 2003 you can save a word file using a xml extension  but
the tag are Mxml...
There is a free software or a open source project that is able to it?

I hope that I explained the problem in the right way...

Thanx
Marina Bortolotti
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