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Object-Role Modeling Fundamentals by Terry Halpin

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Appendix B: ORM Symbol Glossary

This summary of the ORM graphical notation is based directly on my standard ORM symbol glossary, and is used here with my permission.

Construct and Examples

Explanatory Comments

Entity type

Named soft rectangle, named hard rectangle, or named ellipse. The soft rectangle shape is the default.

Value type

Named, dashed, soft rectangle (or hard rectangle or ellipse).

Entity type with popular reference mode

Abbreviation for injective reference relationship to value type, e.g.

Entity ...

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