ZK framework: AJAX without JavaScript

Recently came across ZK framework which can be used to create AJAX based UI without actual JavaScript code. It claims that you do not need to be a programmer to code using ZK framework which actually uses ZUML Markup language to do create the UI. I have not used it yet but look interesting and would like to give it a try.

http://en.wikipedia.org/wiki/ZK (framework)

http://www.zkoss.org/