>> 
> 
> Pardon my ignorance, but can Slot definitions be composed like traits?

I was wondering the same already :-)

e.g. I want to be able to make any slot a hidden slot without having to 
subclass it.

> Because I can imagine wanting, say ProcessLocal + mmm... Static, without 
> having to combine the two properties in a class with a gnarly inheritance 
> tree, or a factorial number of classes combining different defining traits...
> 

The proof-of-concept for how to realise MetaLinks on Slots is using a Wrapper.. 
this way every slot can be annotate with a MetaLink.
Maybe that can be generalised?

        Marcus



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