WAI-ARIA host language requirements rewrite

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

This is an internal Scratch Draft not endorsed by the Protocols and  
Formats Working Group. It is not stable and may change at any time.

This scratch draft has been prepared as a vehicle for sharing a  
possible rewrite to section 6.2.  Please ignore any accidental  
breakage or changes outside that section.  This scratch draft is  
based on the 14 November 2008 version of the Editor's Draft.

The draft is attached.

Al