상황
Model a Level 1 data flow diagram for a university library system that manages book cataloging, member records, and borrowing/return transactions.
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01
External entities (Librarian, Member) are represented as rectangles; processes as rounded boxes; data stores as cylinders.
02
Labeled arrows carry data flows such as 'Book details' and 'Loan request'.
03
Processes interact with multiple data stores (Books DB, Members DB, Loans DB) to maintain consistency.
Applicable when documenting data flows in a library or any system with distinct cataloging, member management, and transaction (borrow/return) workflows.