The first part of this section discusses key aspects and general requirements for geometric and semantic measures. Due
to the overwhelming number of measures that can be found in the literature their review within this paper seems neither
possible nor useful. Instead, the second part of this section demonstrates the process from instantiation of constraints
over the selection of appropriate measures to the enforcement of constraints with the help of two frequent and typical
generalization problems. This procedure should allow to better illustrating problems and alternatives as well as advantages
and restrictions that arise from the data model.