enum DayOfWeekOccurrence

The occurrence of a day in the month, for example the first Monday of the month.
This is used in combination with DayOfWeek to schedule an event on a certain occurence of that day in the month, for example first Monday or last Friday of the month.

References from:: BrmCalendarBasedPeriodicEvent;

`1`	`FIRST` First occurrence.
`2`	`SECOND` Second occurrence.
`3`	`THIRD` Third occurrence.
`4`	`FOURTH` Fourth occurrence.
`5`	`LAST` Last occurrence.
`0`	`ALL` All occurrences.