[SpecGL Draft] D3 Good Practice: Define precisely the extension mechanism

Lynne, and WG.
	(btw Lynne, I will accept all your review work in return ;) )


D.3 Extensibility and Extensions

Previous:
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Good Practice:
	State the conditions under which extensions are prohibited. This 
doesn't have to be complex, it may be a simple statement (e.g., 
extensions are not allowed). The statement is often associated with the 
conformance clause.
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Proposal:
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Good Practice:
	Define precisely the extension mechanism

The rest of the prose doesn't change for now. There might be few 
reorganization of the techniques like:

Remove
	* Is the specification contain a section for extension?
Change	
	* Is there a well defined mechanism to create extension?
	by
	* Is there a well defined template to create exension
	My rationale: The mechanism is the whole thing, not only the pattern 
like in CSS 3 Syntax: "-vendor-property".


-- 
Karl Dubost - http://www.w3.org/People/karl/
W3C Conformance Manager
*** Be Strict To Be Cool ***