Extensible Forms Description Language (XFDL) 4.0

This document describes an XML syntax for the Extensible Forms Description Language (XFDL). The purpose of XFDL is to solve the body of problems associated with digitally representing complex forms such as those found in business and government. The requirements include support for high precision layout, supporting documentation, integrated computations and input validation, multiple overlapping digital signatures, and legally binding auditable transaction records, by maintaining the whole form as a single unit such that digital signatures can capture the entire context of transactions.