It is shown that the definition of generalized localizability, as given by Jauch and Piron, can be justified by direct arguments. A theorem, similar to that of Neumark on representation of POV - measures, is demonstrated for classical systems.
 J. M. Jauch, C. Piron: Generalized Localizability
. Helvetica Physica Acta 40 (1967), 559. Zbl 0152.23901