Sorry for the delayed answer! This is a copy of my answer to the second person who asked the same question to you, it might help...

-----------------------

Learn something everyday, really!

You're the second person to ask the same question recently. The question did not make a lot of sense to me when someone first asked. However, the second time, hmmm, it must have some necessity in it...

Opened my mind, I did a google search on keywords pdf to xml. Wow, there is a ton, in English, even Japanese...

Why I tell you this? Because I think we can learn from each other's experiences. Search by yourself now, since you definitely know better what you need...

Good luck!