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An object–role model uses graphical symbols that are based on [[First-order logic|first order predicate logic]] and set theory to enable the modeler to create an unambiguous definition of an arbitrary universe of discourse. Attribute free, the predicates of an ORM Model lend themselves to the analysis and design of [[graph database]] models in as much as ORM was originally conceived to benefit relational database design.
The term "object–role model" was coined in the 1970s and ORM based tools have been used for more than 30 years – principally for [[data modeling]]. More recently ORM has been used to model [[business rules]], XML-Schemas, [[data warehouse]]s, requirements engineering and web forms.<ref>{{Cite journal | last = Jarrar | first = M. | doi = 10.1007/978-3-540-75563-0_14 | title = Towards Automated Reasoning on ORM Schemes | journal = Lecture Notes in Computer Science. Proceedings of the 26th International Conference on Conceptual Modeling | series = Lecture Notes in Computer Science | volume = 4801 | pages = 181–197 | year = 2007 | bibcode = 2007LNCS.4801..181J | isbn = 978-3-540-75562-3 | citeseerx = 10.1.1.148.6251 }}</ref>
== History ==
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