Relation pm#relation_to_attribute_or_quality_or_measure (*,pm#attribute_or_quality_or_measure)
  exclusion:  pm#relation_to_situation  pm#spatial_relation_to_entity_with_spatial_feature  pm#relation_to_time  pm#relation_to_collection
  subtype:  pm#attribute  pm#relation_to_another_attribute_or_quality_or_measure  akts#has-unit-of-measure
  supertype:  pm#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:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type
  supertype:  pm#how_much_relation (*)
     supertype:  pm#how_relation__howrelation (*)
        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 
           >part of:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type