Based on the Information Engineering notation. This is an extension to the existing Class Diagram. This extension adds: • Additional relations for the Information Engineering notation. • An entity alias for class diagrams. All other features of class diagrams are also supported. 20.1 Information Engineering Relations Type Symbol Zero or One |o-- Exactly One ||-- Zero or Many }o-- One or Many }|-- . . . . . . . . . . . . . . . . . . 271 20 Entity Relationship Diagram 272 20.1 Information Engineering Relations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272 20.2 Entities

Based on the Information Engineering notation. This is an extension to the existing Class Diagram. This extension adds: • Additional relations for the Information Engineering notation. • An entity alias for class diagrams. All other features of class diagrams are also supported. 19.1 Information Engineering Relations Type Symbol Zero or One |o-- Exactly One ||-- Zero or Many }o-- One or Many }|-- (1.2021.1) 379 / 382 CONTENTS CONTENTS 19 Entity Relationship Diagram 267 19.1 Information Engineering Relations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267 19.2 Entities

Based on the Information Engineering notation. This is an extension to the existing Class Diagram. This extension adds: • Additional relations for the Information Engineering notation. • An entity alias for class diagrams. All other features of class diagrams are also supported. 20.1 Information Engineering Relations Type Symbol Zero or One |o-- Exactly One ||-- Zero or Many }o-- One or Many }|-- . . . . . . . . . . . . . . . . . . 288 20 Entity Relationship Diagram 289 20.1 Information Engineering Relations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289 20.2 Entities

Based on the Information Engineering notation. This is an extension to the existing Class Diagram. This extension adds: • Additional relations for the Information Engineering notation. • An entity alias for class diagrams. All other features of class diagrams are also supported. 20.1 Information Engineering Relations Type Symbol Zero or One |o-- Exactly One ||-- Zero or Many }o-- One or Many }|-- . . . . . . . . . . . . . . . . . . 401 20 Entity Relationship Diagram 402 20.1 Information Engineering Relations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402 20.2 Entities