High Quality Content by WIKIPEDIA articles! Extensible Forms Description Language (XFDL) is a class of the Extensible Markup Language (XML) originally specified in World Wide Web Consortium (W3C) Note . See Specifications below for links to the current versions of XFDL. XFDL is a high-level computer language that facilitates defining a form as a single, stand-alone object using XML elements and attributes. It offers precise control over form layout, permitting replacement of existing business/government forms with electronic documents in a human-readable, open standard.