Importing and Exporting Form Data in Acrobat
http://www.planetpdf.com/enterprise/article.asp?ContentID=Importing%5Fand%5Fexporting%5Fform%5Fdata%5Fin%5FAcrobat&gid=7445

Shea, Dan
PlanetPDF
2007

Abstract:

When using PDF forms, it's possible to export, store and import the data in Form Data Format (FDF). Since an FDF file only includes the form data and not the form itself, it is much smaller and more lightweight that the complete PDF form, making it more efficient to manipulate. This tip explains how to export and import FDF data using Acrobat.