This is the strongest relation between frames, corresponding to is-a in many ontologies. With this relation, anything which is strictly true about the semantics of the Parent must correspond to an equally or more specific fact about the Child. This includes Frame Element membership of the frames (except for Extrathematic FEs), most Semantic Types, frame relations to other frames, relationships among the Frame Elements, and Semantic Types on the Frame Elements. Properties of the Parent which are not strictly semantic in nature, such as not being evoked by lexical units (i.e. the Semantic Type Non-lexical frame), being evoked by a particular set of Lexical Units, or having a See also relation to another frame, are not inherited. Also, when there is a Core-set or an Excludes relation among Frame Elements of the Parent, these constitute disjunctive properties of the Parent. The Child frame may legitimately inherit only a subset of these disjunctive Frame Elements. xsd:string