AbstractionFn concept from the SUMO knowledge base

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AbstractionFn	*documentation* A UnaryFunction that maps a Class into the instance of Attribute that specifies the condition(s) for membership in the Class
	has axiom (<=> (equal (AbstractionFn ?CLASS) ?ATTR) (forall (?INST) (<=> (instance ?INST ?CLASS) (attribute ?INST ?ATTR))))
	has domain1 Class
	has range Attribute
	*is an instance* of** UnaryFunction
BinaryRelation	*is first domain* of** DomainFn
	*is first domain* of** equivalenceRelationOn
	*is first domain* of** inverse
	*is first domain* of** irreflexiveOn
	*is first domain* of** partialOrderingOn
	*is first domain* of** RangeFn
	*is first domain* of** reflexiveOn
	*is first domain* of** totalOrderingOn
	*is first domain* of** trichotomizingOn
	*is second domain* of** inverse
Function	*is first domain* of** AssignmentFn
	*is first domain* of** closedOn
	*is first domain* of** range
	*is first domain* of** rangeSubclass
Class	*is third domain* of** domain
Class	*is third domain* of** domainSubclass
Abstract	*is disjoint* from** Physical