[Tagging] Power generation refinement: power plant model evolution

Alberto albertoferraris at fastwebnet.it
Tue Apr 9 17:48:00 UTC 2013

> This is where I still don't understand you: why do I need to specify 
> that
>> a feature XXX has the role XXX? Why do I need to specify, that a 
>> generator is a generator? A substation a substation? A dam a dam? A 
>> valve a valve? A weir a weir? And so on.
> This is just because a role must be specified.

> Why do I have to specify a role?

Yes, roles can be omitted. In some existing types of relations members
haven't a role.
In this case we can omit them.

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