WDDX WDDX (Web Distributed Data eXchange) is a programming-language-neutral data interchange mechanism to pass data between different environments and different computers. It supports simple data types such as number, string, boolean, etc., and complex aggregates of these in forms such as structures and arrays. There are WDDX interfaces for a wide variety of languages. The data is encoded into XML using an XML 1.0 DTD, producing a platform-independent but relatively bulky representation. The XML-encoded data can then be sent to another computer using HTTP, FTP, or other transmission mechanism. The receiving computer must have WDDX-aware software to translate the encoded data into the receiver's native data representation. The WDDX protocol was developed in connection with the ColdFusion server environment. Python, PHP, Java, C++, .NET, lisp, Haskell and various platforms support it very well.