Relation akts#temporal_relation_from_time_point (time_point,nonnegative_integer)
  supertype:  temporal_relation
  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)