Relationpm#relation_with_variable_arity(*)this category only serves structuration purposes: it is instance of pm#variable_arity_relation_type which is not instance of pm#class_of_inheritable_relation_type; currently not specialized by the SUMO ternary relations since this seems useless (for now)exclusion: pm#binary_relation pm#ternary_relation pm#quaternary_relation type: pm#variable_arity_relation_typeclass of relations that do not have a fixed number of argumentssupertype: pm#relation_with_particular_property (*)this rather fuzzy type permits to group categorization schemes less common than those covered by the previous sibling categoriessupertype: pm#relation__related_thing__relatedthing___related_with (*)type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type