API Reference > presentation-common > PresentationRules > ChildNodeSpecificationBase ChildNodeSpecificationBase Interface Base interface for all ChildNodeSpecification implementations. Not meant to be used directly, see ChildNodeSpecification. Properties Name Type Description doNotSort undefined | boolean Set this flag to true to suppress default sorting of ECInstances returned by this specification. hasChildren "Always" | "Never" | "Unknown" This tells the rules engine that nodes produced using this hideExpression undefined | string An ECExpression which hideIfNoChildren undefined | boolean Hide nodes if they don't have children. hideNodesInHierarchy undefined | boolean Hide instance nodes provided by this specification and directly show nodes of its children. nestedRules undefined | ChildNodeRule[] Nested rule specifications. priority undefined | number Defines the order in which specifications are evaluated and executed. relatedInstances undefined | RelatedInstanceSpecification[] Specifications of related instances that can be used in nodes' creation. specType ChildNodeSpecificationTypes Used for serializing to JSON. suppressSimilarAncestorsCheck undefined | boolean Suppress similar ancestor nodes' checking when creating nodes based on this specification. Beta Defined in presentation/common/src/presentation-common/rules/hierarchy/ChildNodeSpecification.ts Line 38 Last Updated: 29 November, 2022