(4.5.11) Arbuznikov and Kaupp : Regarding the discussion in contribution (4.5.2), we would like to make a point about the difference between global and local exact constraints. Most of the extremely important and useful known and proven exact constraints pertain to global (integral) energy functionals. Yet most DFAs are designed with local (exchange and/or correlation) energy densities in mind. Apart from the issue of the nonuniqueness of any energy density (only defined up to a real-space function whose integral vanishes), constructions often apply known "global" constraints locally, even though the local versions of the constraints are usually ill-defined or unknown.