From http://www.adobe.com/devnet/acrobat/fdftoolkit.html
XFDF is an XML format. You can use any standard XML tool to process
XFDF.
methods available in Acrobat:
doc.exportAsXFDF
doc.exportAsXFDFStr
if you generated your form in LiveCycle:
Forms created with LiveCycle Designer produce XML data. You can use
any standard XML tool to process XML data.
Hope it helps.