API Reference > presentation-common > PresentationRules > QuerySpecificationBase QuerySpecificationBase Interface Base interface for all QuerySpecification implementations. Not meant to be used directly, see QuerySpecification. Properties Name Type Description class SingleSchemaClassSpecification Specification of ECClass whose instances the query returns. specType QuerySpecificationTypes Used for serializing to JSON. Defined in presentation/common/src/presentation-common/rules/hierarchy/CustomQueryInstanceNodesSpecification.ts Line 52 Last Updated: 12 June, 2024