UML Use Case Diagram Examples

An Online Public Access Catalog (OPAC) is an e-Library website which is part of Integrated Library System (ILS), also known as a Library Management System (LMS), and managed by a library or group of libraries.
Patrons of the library can search library catalog online to locate various resources - books, periodicals, audio and visual materials, or other items under control of the library. Patrons may reserve or renew item, provide feedback, and manage their account.
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An example of UML use case diagram for e-Library Online Public Access Catalog.

https://www.uml-diagrams.org/online-library-uml-use-case-diagram-example.html