Relation pm#location (spatial_object,spatial_object)
  subtype:  address  above  below  near  far_from  exterior  interior  before_location
  similar_to:  relative_location  connection_of_individual
  supertype:  relation_to_another_spatial_object (spatial_object,spatial_object)
     supertype:  relation_from_spatial_object (spatial_object,*)
        supertype:  spatial_relation_from_entity_with_spatial_feature (object,*)
           supertype:  relation_from/to_thing_of_common_kind (*)  this type permits to categorize relations according to their signatures and hence offers (i) a concise way to set essential exclusion relations, and (ii) a systematic and easy-to-follow categorization
              >part of:  relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type
     supertype:  relation_to_spatial_object (*,spatial_object)  in WebKB, prefer using relations "from" a spatial object
        supertype:  spatial_relation_to_entity_with_spatial_feature (*,object)
           supertype:  relation_from/to_thing_of_common_kind (*)  this type permits to categorize relations according to their signatures and hence offers (i) a concise way to set essential exclusion relations, and (ii) a systematic and easy-to-follow categorization
     supertype:  where_relation__whererelation (*)  where, from/to where, ...
        supertype:  wh-/how_relation (*)  this type permits to categorize relations according to the usual who/what/why/where/when/how questions ; this is a traditional but very subjective and ineffective way of categorizing relations 
           >part of:  relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type