Relation pm#or (description,description)
  supertype:  contextualizing_logical_relation__contextualizinglogicalrelation (description,description)
     supertype:  logical_relation__logicalrelation (description,description)
        supertype:  relation_from_description (description,*)
           supertype:  relation_from_description_content/medium/container (description_content/medium/container,*)
              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:  contextualizing_relation__contextualizingrelation (description,*)
        supertype:  relation_from_description (description,*)
        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