ENUM
An enumeration.
enum PeriodKind {CustomYearPreviousYearCurrentYearNextYear3LastWeekPreviousWeekCurrentWeekNextWeek2LastWeek4LastFinancialYearPreviousFinancialYearCurrentFinancialYearNextQuarter1Quarter2Quarter3Quarter4QuarterPreviousQuarterCurrentQuarterNextQuarterCurrentInPreviousYearQuarter4PreviousMonthPreviousMonthCurrentMonthNextMonthCurrentInPreviousYearMonth3LastTodayTomorrowYesterdayUpToTodayDays30PreviousDays30NextDays7NextDays14NextDays7PreviousAll}