[henshin-dev] LoopUnit

[Christian Krause <henshin.ck@xxxxxxxxx>]

Hi,

I know I said that we should stick with the model changes that we have 
so far, but there is one thing that is bugging me and I would like to 
use the opportunity to change the Henshin model at one more place.

CountedUnits with positive count can be directly modeled using 
SequentialUnits (correct me if I'm wrong). The only interesting case is 
when the count value is negative, which should have a "loop as long as 
possible" semantics. Since this is the only interesting case, I suggest 
that we remove CountedUnit from the model and add a LoopUnit, which 
behaves like a CountedUnit with a negative count value.

Please comment / vote.

Cheers,
Christian

PS: Felix, if you are concerned about the extra work that is necessary 
for the migration code, I can support you there.