API Reference > presentation-common > PresentationRules > ContentInstancesOfSpecificClassesSpecification > arePolymorphic arePolymorphic Deprecated Use handleInstancesPolymorphically arePolymorphic: undefined | boolean Should all ContentInstancesOfSpecificClassesSpecification.classes be treated polymorphically. Defined in presentation/common/src/rules/content/ContentInstancesOfSpecificClassesSpecification.ts Line 33 Last Updated: 13 June, 2024