XFA stands for XML Forms Architecture, and is part of a family of proprietary XML specifications that were developed by JetForm to enhance the processing of web based forms, however starting at PDF Specfication 1.5 it was possible to be used with XFA, but XML Forms Architecture was not standardized when the PDF Format became an ISO standard.
XFA
In this article I demonstrates some tips and techniques that can be followed while trying to map PDF XFA data to a XFA template.... Introduction XFA data exists in a different format to normal PDF data. This article is designed to help you understand how this happens and... It is a bit of complex task if any attempt is made to try and display XFA forms (by following the XFA specification) in... 
