Relation pm#what_relation (*)
  subtype:  pm#object/result  pm#process_attribute  pm#mereological_relation  pm#method  pm#relation_from_collection  pm#relation_to_collection  pm#contextualizing_relation
  supertype:  pm#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 
     supertype:  pm#relation__related_thing__relatedthing___related_with (*)  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type


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