API Reference > imodeljs-backend > iModels > IModelDb > IModelDb.Elements > deleteDefinitionElements deleteDefinitionElements Method Beta DefinitionElements can only be deleted if it can be determined that they are not referenced by other Elements. This usage query can be expensive since it may involve scanning the GeometryStreams of all GeometricElements. Since IModelDb.Elements.deleteElement does not perform these additional checks, it fails in order to prevent potentially referenced DefinitionElements from being deleted. This method performs those expensive checks and then calls delete if not referenced. deleteDefinitionElements(definitionElementIds: Id64Array): Id64Set see IModelDb.Elements.deleteElement Parameter Type Description definitionElementIds Id64Array Returns - Id64Set An IdSet of the DefinitionElements that are used and were therefore not deleted. Defined in core/backend/src/IModelDb.ts Line 1704 Last Updated: 12 June, 2024