xsd:string An Agent (or inanimate Cause) affects a Set so that the number of entities that make up the Set changes from an Initial_number to a Final_number. Alternatively, the situation can be described in terms of an Initial_state and a Final_state. In some cases the Attribute (i.e., number) or Difference in number may be mentioned. More and more resources have been devoted to halting rogue nation's proliferation of controlled nuclear technology.