enum PeriodEnum: <"The enumerated values to specified the period, e.g. day, week.">
    D displayName "day" <"Day">
    M displayName "month" <"Month">
    Y displayName "year" <"Year">

type Period extends TestType: <"description">
    periodMultiplier int (1..1) <"A time period multiplier, e.g. 1, 2 or 3 etc. A negative value can be used when specifying an offset relative to another date, e.g. -2 days.">
    testMany TestType (0..*) <"Test many">
    testSome TestSomeType (1..*) <"Test some">
    testMaybeOne TestZeroOneType (0..1) <"Test zero or one">

type TestType:
    testType int (1..1)

type TestSomeType: <"description">
    testSomeType int (1..1) <"A time period multiplier, e.g. 1, 2 or 3 etc. A negative value can be used when specifying an offset relative to another date, e.g. -2 days.">

type TestZeroOneType extends Period:
    testZeroOneType int (1..1)

type ObservationPrimitive:
    observationPrimitive int (1..1)

func EquityPriceObservation: <"Function specification for the observation of an equity price, based on the attributes of the 'EquityValuation' class.">
   inputs:
      equity int (1..1)
      valuationDate ObservationPrimitive (0..1)
      valuationTime int (0..1)
      timeType TestType (0..1)
      determinationMethod ObservationPrimitive (1..1)
   output:
      observation ObservationPrimitive (0..1)

   assign-output: if True and False then valuationDate

func Something: <"asd">
    inputs:
      equity1 boolean (1..1)
      valuationTime ObservationPrimitive (1..1)
    output:
      valuation ObservationPrimitive (0..*)

    assign-output: if True and False then valuationTime

func SomethingElse: <"dsa">
    inputs:
      valuationTime ObservationPrimitive (1..1)
    output:
      valuation ObservationPrimitive (0..1)

    assign-output: if True and False then valuationTime