Model object reference.
export type ObjRef = UriRef | IdentifierRef;
Note: you should avoid manually creating and maintaining object references. The recommended practice is to treat your logical data model as code; you can achieve this by using the catalog-exporter tool which can create code representation of the various LDM entities. You can then use this code in conjuction with the various factory and builder methods in sdk-model to conveniently construct visualizations.