SHOULD vs. MUST and abstract roles

> Note: Abstract roles are used for the ontology. Authors SHOULD NOT  
> use abstract roles in content.

Please make that 'MUST NOT', since using abstract roles is  
unambiguously an error if user agents don't support the abstract roles  
as concrete.

-- 
Henri Sivonen
hsivonen@iki.fi
http://hsivonen.iki.fi/

Received on Wednesday, 20 May 2009 09:05:06 UTC