Extensible page description language for SWT written as a Scala internal DSL. Incldes style sheets, data binding, more... Presentation here: http://www.coconut-palm-software.com/pix/scala_declarative_dsls2.svg (Unfortunately quality SVG playback has degraded over the years, Firefox still works but Chrome and IE longer display the presentation. I haven't checked Safari recently but it used to work well.)
