R21. Any public interface for creating extensions should be speakable

Group,

This is the next of the requirements to discuss and prioritize based  
on our ranking approach [1].

This email is the beginning of a thread for questions, discussion, and  
opinions regarding our first draft of Requirement 21 [2].

Please discuss via email as we agreed at the Lyon f2f meeting.   
Outstanding points of contention will be discussed live at the next  
teleconference.

-- dan

[1] http://lists.w3.org/Archives/Public/public-xg-htmlspeech/2010Oct/0024.html
[2] http://lists.w3.org/Archives/Public/public-xg-htmlspeech/2010Oct/att-0001/speech.html#r21