10 UMLClass 320 110 150 100 BOOK -- isbn# ID title price anthor-name[1..*] bg=#dddddd UMLClass 320 270 150 90 BOOK -- isbn# ID title price bg=#dddddd UMLClass 660 290 160 50 Author -- author-name ID bg=#dddddd Relation 460 290 220 50 lt=- m1=1..* r1= m2=1..* Is-written-by 10.0;20.0;200.0;20.0