상황
A public library needs a class model to design its circulation system, covering members, librarians, catalog, physical book copies, loans, reservations, and fines.
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01
Abstract User class centralizes shared attributes for Member and Librarian
02
Separate Book (catalog metadata) from BookItem (physical copy)
03
Loan connects Member, Librarian, and BookItem with a 1-to-0..1 association to Fine
Reuse when designing or documenting the object-oriented domain model for any library circulation, catalog, or self-service system.