Function pm#from/to_place__from/toplace (process -> spatial_object)
  subtype:  from_place  to_place  via_place  path
  supertype:  from/to (situation,entity)
     supertype:  doer/object/result/place (situation,?)
        supertype:  case_relation__thematic_relation (situation,*)
           supertype:  relation_from_situation (situation,*)
              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:  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
  supertype:  relation_from_process_only (process,?)
     supertype:  case_relation__thematic_relation (situation,*)