Object - Association relationship (link)

Bank

Bank: Given a Bank, a particular accountNo identifies zero or one Person where:

• the qualifier is the Property accountNo,
• the qualified object is the Bank.

Chessboard

• where every possible value for Rank and File indicates an individual Square because the multiplicity is 1:1 (Therefore an individual Square on the Chessboard may be identified by rank and file)
• with a composite relationship (black diamond)