ORM 2 Graphical Notation
Terry Halpin · 2005
Object-role Modeling (ORM) is a fact-oriented modeling approach for expressing, transforming and querying information at a conceptual level. Unlike Entity-Relationship modeling and Unified Modeling Language class diagramming, fact-oriented modeling is attribute-free, treating all elementary facts as relationships expressed in natural language sentences. For information modeling, ORM graphical notations are typically far more expressive than other notations, and ORM’s attributefree nature promotes semantic stability and facilitates natural verbalization. Based on industrial experience that identified ways to improve current ORM languages and associated tools, a project is under way to provide open-source tool support for a second generation ORM (ORM 2), that has significant advances over current ORM technology. This paper provides an overview of, and motivation for, the enhancements introduced by the ORM 2 graphical notation.