John {SalesStaff} an instance of class SalesStaff is created with name
John.
John (Mary) {SalesStaff} an instance of class SalesStaff is created with name John
physically near to the persistent object Mary. In this
context, ‘physically near’ is implementation-dependent.
John SalesStaff{WorksAt B001} creates a relationship called WorksAt between the
instance John of class SalesStaff and the object named
B001.