As part of our work at the WAI (Web Accessibility Initiative) we have been building taxonomies to add to other base languages for enhanced accessibility.
The roles and adaptable properties drafts are now public.
The main current use case at the moment is scripting and dynamic content , but we hope to extend it soon to give a better structure of a page and  types of content for better adaptation.

 http://www.w3.org/WAI/PF/GUI
 http://www.w3.org/WAI/PF/adaptable

The current use case is explained in full detail at
http://www.w3.org/WAI/PF/roadmap

I would love hear (polite) feedback , or you can send feedback to  wai-xtech@w3.org

All the best
Lisa Seeman