pm#thing_needed_for_KADS_knowledge_engineering
  subtype:  pm#knowledge_engineering_with_KADS  pm#KADS_model  pm#description_with_KADS_inference_structure  kads#role
  supertype:  pm#thing_needed_for_knowledge_engineering
     supertype:  pm#thing_needed_for_some_process
        supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
           supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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