static std::string PeriodToString(PERIOD period);
static PERIOD StringToPeriod(const std::string& value);
static std::string TraffTypeToString(TRAFF_TYPE type);
static TRAFF_TYPE StringToTraffType(const std::string& value);
static std::string PeriodToString(PERIOD period);
static PERIOD StringToPeriod(const std::string& value);
static std::string TraffTypeToString(TRAFF_TYPE type);
static TRAFF_TYPE StringToTraffType(const std::string& value);