Communications of the ACM
Conceptual schemas with abstractions making flat conceptual schemas more comprehensible
Data & Knowledge Engineering
Information Modeling and Relational Databases
Information Modeling and Relational Databases
OTM'05 Proceedings of the 2005 OTM Confederated international conference on On the Move to Meaningful Internet Systems
Formal specification of a meta hierarchical logical data model using object role modeling
OTM'11 Proceedings of the 2011th Confederated international conference on On the move to meaningful internet systems
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Object Role Modeling (ORM) can be used to produce conceptual models of any scale. Although small examples are often used to illustrate specific points, it is equally possible to produce large models covering extensive business domains. To help users navigate around a large model, the ORM diagram is typically split over several virtual pages. This gives a fairly coarse granularity and it is difficult for users to change the page structure to meet some temporary viewing need. This paper describes an alternative approach that allows objects of lesser interest to be temporarily 'folded' away and 'unfolded' when required. The folding and unfolding can be dynamically controlled by the user, but operates under the control of specific algorithms. Some possible algorithms are discussed and illustrated with examples, and a number of usability issues are raised.