API Reference > presentation-common > PresentationRules > ContentSpecificationBase > specType specType specType: "ContentInstancesOfSpecificClasses" | "ContentRelatedInstances" | "SelectedNodeInstances" Used for serializing to JSON. see ContentSpecificationTypes Defined in presentation/common/src/presentation-common/rules/content/ContentSpecification.ts Line 36 Last Updated: 20 June, 2023