I think this approach does not work for my requirements. The problem is
that a different metamodel is different for a complete editor. As far as I
understand is there no possibility to say apply this model on only 3
elements on the diagram.
My target would be to have a way to select connections (which are the
direct representation of the business model) and replace them with another
connection which is somehow a summary of the selected elements. But this
should not be reflected in the businessmodel itself.
So is there probably a way to partly unsync the business model from the
diagram so that I am able to remove the edges in the notational model and
create my own edge which is linked to multiple aggregated elements?