The Object Relationship Notation (ORN) was first described in Ehlmann et al. (1992). It was proposed for “representing non-inheritance relationships in an object-oriented, scientific database,” as indicated by the title of this 1992 paper. Like the relational and ER models, ORN has evolved from what was originally proposed. Its syntax, graphical representation, and semantics have changed slightly, and it has been integrated into UML class diagrams, adapted to relational databases, and applied to the development of all types of databases, not just scientific (Ehlmman and Riccardi 1994, Ehlmann and Stewart 1997, Neal and Ehlmann 2000, Ehlmann and Yu 2002, Ehlmann 2006).
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Ehlmann, B.K. (2009). Object Relationship Notation (ORN). In: Object Relationship Notation (ORN) for Database Applications. Advances in Database Systems, vol 39. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-09554-7_2
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DOI: https://doi.org/10.1007/978-0-387-09554-7_2
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