Relation dl#location (entity,region)
  supertype:  exact_location__exactlocation
  inverse:  location_of
  subtype:  physical_location (physical_endurant,physical_region)
     subtype:  spatial_location__spatiallocation (physical_endurant,space_region)
  subtype:  temporal_location (perdurant,temporal_region)
     subtype:  duration (perdurant,temporal_region)