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
Last month we had an exciting announcement: we have released our new browser-based PDF Form viewing solution, FormVu. What is FormVu? FormVu is a... This simple article explains how to send XFA form data as an email in two possible ways. Why does the client need to send data as... At IDR Solutions I spend a lot of time working on XFA for our Java PDF Library and PDF to HTML5 Converter and during... At IDR Solutions we spend alot of time working with XFA in our Java PDF Library. I have spent a lot of time working... As you may aware of that displaying XFA based PDF files in HTML format is a critical part in the PDF to HTML conversion... 
