#include <FWCore/MessageService/interface/MessageServicePSetValidation.h>
Description: Checking MessageService PSet in _cfg.py file for subtle problems
Usage: MessageServicePSetValidation v; std::string valresults = v(iPS); where iPS is (passed by const reference) the MessageService PSet If valresults is not empty, then problems were found. (This is later checked in preSourceConstructor or preModuleConstructor)