sumo#time_point  the time_points at which processes occur can be known with various degrees of precision and approximation, but conceptually time_points are point-like and not interval-like; that is, it doesn't make sense to talk about how long a time_point lasts
  closed_exclusion:  sumo#time_interval
  supertype:  sumo#time_position  any time_point or time_interval along the universal timeline from negative_infinity to positive_infinity
  equal:  akts#Time-Point (pm)
  akts#second-of:  sumo#nonnegative_integer [*,48..49]
  akts#minute-of:  sumo#nonnegative_integer [*,48..49]
  akts#hour-of:  sumo#nonnegative_integer [*,48..49]
  akts#day-of:  sumo#nonnegative_integer [*,48..49]
  akts#month-of:  sumo#nonnegative_integer [*,48..49]
  akts#year-of:  sumo#nonnegative_integer [*,48..49]
  subtype:  akts#Calendar-Date  a point in time 

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