Functionsumo#extension_fn__extensionfn(sumo#Attribute -> sumo#class)a unary_function that maps an attribute into the class whose condition for membership is the attributetype: pm#unary_function_typeclass of functions requiring a single argument; if R is functional, then if R(x -> y) and P(x -> z) then y=ztype: pm#partial_valued_relation_typerelation type that is not a total_valued_relation_type, i.e. just in case assigning values to every argument position except the last one does not necessarily mean that there is a value assignment for the last argument position; note that, if a sumo#relation is both a partial_valued_relation and a single_valued_relation, then it is a partial functionsupertype: pm#relation_from_attribute_or_quality_or_measure (pm#attribute_or_quality_or_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 categorizationsupertype: pm#relation__related_thing__relatedthing___related_with (*)type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_typesupertype: pm#relation_to_class (*,rdfs#class) supertype: pm#relation_to_set_or_class (*,pm#set_or_class) supertype: pm#relation_to_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 categorizationsupertype: 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 relationssupertype: pm#relation__related_thing__relatedthing___related_with (*)type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_typesupertype: pm#relation_to_type (*,pm#type) supertype: pm#relation_to_collection (*,pm#collection)