API Reference > presentation-common > PresentationRules > DEPRECATED_RelatedInstanceNodesSpecification > relatedClasses relatedClasses relatedClasses: MultiSchemaClassesSpecification | MultiSchemaClassesSpecification[] Related classes whose instances should be returned as content. Optional if DEPRECATED_RelatedInstanceNodesSpecification.relationships is specified. Defined in presentation/common/src/presentation-common/rules/hierarchy/RelatedInstanceNodesSpecification.ts Line 49 Last Updated: 29 November, 2022