Thanks for the explanation and the hint regarding revision comparision.
But that means if I (or two persons) work simultaneously on different
versions of a rule each one will and needs to create new revisions. In
the end this means that e.g. revision 1,2 are from V1 and revision 3,4
are from V2 and revision 5 from V1 again and revisions 1 to 5 do not
reflect a step by step evolution of the element. And currently working
on V1 I need to remember that revision 2 (and not 3 or 4) is the last
versio...