Relation sumo#disjoint_relation (pm#relation_type+)  (sumo#disjointRelation @ROW) means that any two relations in @ROW have no tuples in common; as a consequence, the intersection of all of the relations in @ROW is the null set
  related_to:  sumo#disjoint
  type:  pm#predicate_type__predicatetype  a sentence-forming relation with each tuple being a finite, ordered sequence of objects
  type:  pm#variable_arity_relation_type  class of relations that do not have a fixed number of arguments
  supertype:  pm#relation_from_relation_type (pm#relation_type,*)
     supertype:  pm#relation_from_type (pm#type,*)  type of relations from a concept/relation type, i.e. in RDFS terminology, from a class or a property
        supertype:  pm#relation_from_collection (pm#collection,*)
           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#what_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 
                 >part of:  pm#relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type


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