Unified modeling language diagrams for library management system?

Answer:
Library Domain Model describes main classes and relationships which could be used during analysis phase to better understand domain area for Integrated Library System (ILS), also known as a Library Management System (LMS).

An Online Public Access Catalog (OPAC) is e-Library website which is part of Integrated Library System or Library Management System, 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.

See links below with examples.
First answer by Kirfa. Last edit by Kirfa. Contributor trust: 3 [recommend contributor recommended]. Question popularity: 1 [recommend question].