Relation akts#temporal_relation (?,?)
  supertype:  temporal_relation (pm)
  subtype:  temporal_relation_from_time_point (time_point,nonnegative_integer)
     subtype:  second-of (time_point,nonnegative_integer)
     subtype:  minute-of (time_point,nonnegative_integer)
     subtype:  hour-of (time_point,nonnegative_integer)
     subtype:  day-of__dayof (time_point,nonnegative_integer)
     subtype:  month-of__monthof (time_point,nonnegative_integer)
     subtype:  year-of (time_point,nonnegative_integer)
  subtype:  temporal_relation_from_time_interval (time_interval,temporal_region)
     subtype:  begins-at-time-point (time_interval,time_point)
     subtype:  ends-at-time-point (time_interval,time_point)
     subtype:  has-duration__hasduration (time_interval,time_duration)
  subtype:  has-time-interval (temporal_thing,time_interval)
  subtype:  in-timezone (time_position,integer)