Mutual Exclusion

Hi,

I've been wondering why is it recommended that the facets have to be 
mutually exclusive? Is it to prevent user confusion?

I think there are some scenarios where not mutually exclusive facets
might be needed, for instance if I have this two facets:

Performance:
	Response time
	Memory usage
	CPU usage

Development process:
	Object oriented
	Aspect oriented
	Functional


Say now that a document shows how to reduce the response time from an 
object oriented point of view. Then the same document belongs to the 
two facets...

Does this mean that these facets are wrong and must be redesigned? 

-- 
Vinko Vrsalovic <el[|-@-|]vinko.cl>
http://www.cprsig.cl

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