Relation pm#relation_to_another_spatial_object (spatial_object,spatial_object)
  supertype:  relation_from_spatial_object  relation_to_spatial_object  where_relation
  subtype:  location (spatial_object,spatial_object)
     subtype:  address__addres (spatial_object -> spatial_object)
        subtype:  main_address (spatial_object -> spatial_object)
        subtype:  secondary_address__secondaryaddres (spatial_object -> spatial_object)
     subtype:  above (spatial_object -> spatial_object)
        subtype:  on (spatial_object -> spatial_object)
     subtype:  below (spatial_object,spatial_object)
     subtype:  near (spatial_object -> spatial_object)
        subtype:  touching (spatial_object -> spatial_object)
     subtype:  far_from__farfrom (spatial_object,spatial_object)
     subtype:  exterior__in (spatial_object -> spatial_object)
     subtype:  interior (spatial_object,spatial_object)
     subtype:  before_location__before (spatial_object,spatial_object)
  subtype:  spatial_part__spatialpart (spatial_object,spatial_object)
     subtype:  physical_part (physical_entity,physical_entity)