The “dayPeriod” attribute on the ‘TemporalPropertyType’ has a data type of “DayPropertyType”. The below table describes how this data type is constructed.
Constraints: A DayPropertyType shall have at least one of namedDay, namedPeriod, or timePeriod. When namedDay = 'All Days' no other values for namedDay or namedPeriod shall be populated.