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

   assign-output: if asd exists then var2