sumo#time_position  any time_point or time_interval along the universal timeline from negative_infinity to positive_infinity
  supertype:  temporal_region__TR (dl)  a value for a temporal quality, e.g., 24/5/2002, 2 seconds
  equal:  Time-Position (pm)
  subtype:  time_interval  a time_interval has both an extent and a location on the universal timeline; a time_interval has no gaps, i.e. this class contains only convex time intervals
     subtype:  Day
     subtype:  Week
     subtype:  Month
     subtype:  Year
  subtype:  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
     subtype:  Calendar-Date  a point in time 

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