The unique identifier (UIDs) for a set of hierarchical entities can be propagated by using multiple barred relationship.
UID is anacronym for unique identifier and it can be defined as an alphanumeric or numeric string that is associated with a single entity or unique among all identifiers within an information system (IS).
This ultimately implies that, unique identifier (UIDs) are identifiers that marks a particular record within an information system (IS) as unique from every other record.
In Computer science, the unique identifier (UIDs) for a set of hierarchical entities can be propagated by using multiple barred relationship because they represent the relationships between the originating entities and the intersection entity.
Read more on a unique identifier here: brainly.com/question/25619349
