Individual akts#time-measure-day__day
  has-unit-of-measure of:  seven-day-duration [55,*]
  has-unit-of-measure of:  twentyeight-day-duration [50,*]
  has-unit-of-measure of:  twentynine-day-duration [50,*]
  has-unit-of-measure of:  thirty-day-duration [51,*]
  has-unit-of-measure of:  thirtyone-day-duration [51,*]
  type:  unit_of_time_duration  the class of all unit of measures used to measure time, e.g., minute, second, hour, etc.

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