Relation pm#relation_from_situation_to_time (pm#situation,pm#time_measure)
  exclusion:  pm#relation_from_situation_to_situation
  supertype:  pm#relation_from_situation  pm#relation_to_time
  subtype:  pm#time (pm#situation,pm#time_measure)
     subtype:  pm#date (pm#situation -> pm#time_measure)
  subtype:  pm#duration (pm#situation -> pm#time_measure)
  subtype:  pm#from_time (pm#situation -> pm#time_measure)
     subtype:  pm#departure_time__departuretime (pm#process -> pm#time_measure)
  subtype:  pm#until_time__untiltime__to_time (pm#situation -> pm#time_measure)
     subtype:  pm#arrival_time__arrivaltime (pm#process -> pm#time_measure)
  subtype:  pm#before_time (pm#situation,pm#time_measure)