PDF to FO tool?

Hi all,
      I have been earnestly trying to find a tool that converts a .PDF file
to .FO or some close approximation of that. I will be creating complex PDF
documents using XML/ XSLT and I already have the PDF format (for final look
and feel). For some reason I thought I had heard (or read) that there was
such a tool. Any direction is greatly appreciated.

Thanx,
Jeremy






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