WAI-ARIA host language requirements rewrite (v.3)

 From the "status of this document" in this scratch draft:

> This scratch draft has been prepared as a vehicle for sharing a  
> possible rewrite to sections 6.2 and 7.3.  This change is an  
> attempt to permit weak and strong implicit ARIA semantics to be  
> controlled by the host language.
> Please ignore any accidental breakage or changes outside those  
> sections.  This scratch draft is based on the 14 November 2008  
> version of the Editor's Draft.

The draft is attached.

Al