Subject this is the separate thread on entity-categories vs requiredattributes
From Leif Johansson <leifj@xxxxxxxx>
Date Wed, 29 Oct 2014 18:38:53 +0100

So just to be clear about this: entity categories can't solve all issues
with attribute release wo something like requiredattributes
since entity categories typically don't let the SP fulfil the
minimality requirements.

The R&S category is an example of this: you have to signal both
R&S *and* the list of attributes it needs.

	Cheers Leif