API Reference > presentation-common > PresentationRules > ContentInstancesOfSpecificClassesSpecification > handlePropertiesPolymorphically handlePropertiesPolymorphically handlePropertiesPolymorphically: undefined | boolean Whether to get content from properties of derived classes. If true, properties from classes with no instances do not appear in the result set. Defined in presentation/common/src/presentation-common/rules/content/ContentInstancesOfSpecificClassesSpecification.ts Line 43 Last Updated: 12 June, 2024