Relation pm#material (process,?)
  supertype:  input (process,?)
     supertype:  object__patient___theme__theme (situation,?)
        supertype:  object/result (situation,?)
           supertype:  doer/object/result (situation,?)
              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:  what_relation (*)
              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:  object_relation (?,?)
           supertype:  relation_playing_a_special_role (*)  this type permits to categorize relations according to their roles ; this is a traditional but quite subjective 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,*)