ORM (Object-Role Modeling) is a rich and well-known conceptual modeling method. As ORM has a formal semantics, reasoning tasks such as satisfiability checking of an ORM schema naturally arise. Satisfiability checking allows a developer to automatically detect contradicting constraints. However, no complete satisfiability checker is known for ORM. In this paper, we revisit existing patterns from...

Article history: Received 28 July 2010 Received in revised form 30 November 2010 Accepted 30 November 2010 Available online 13 December 2010

We present a temporal object model capable of representing object lifespans and also the history of their roles and associations. We adopt an approach of temporal generalisation rather than temporal extension in which a model in its entirety is given a temporal semantics through an orthogonal generalisation of all model concepts { including the lifespan of object roles themselves and constraint...

The representation of things and properties is a fundamental issue in conceptual modelling. Important theoretical issues surrounding the representation of things and properties remain unresolved. For example, proponents of object-role modelling argue that there should be no distinction between things and properties, while proponents of entity-relationship modelling argue that the distinction is...

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