Basic accessible data types

AtkRange — A given range or subrange, to be used with AtkValue
AtkRelation — An object used to describe a relation between a object and one or more other objects.
AtkRelationSet — A set of AtkRelations, normally the set of AtkRelations which an AtkObject has.
AtkState — An AtkState describes a single state of an object.
AtkStateSet — An AtkStateSet contains the states of an object.