The entity-relationship model—toward a unified view of data
ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
NIAM Information Analysis Method: Theory and Practice
NIAM Information Analysis Method: Theory and Practice
Foundations of Databases: The Logical Level
Foundations of Databases: The Logical Level
Information Modeling and Relational Databases
Information Modeling and Relational Databases
Mapping ORM to datalog: an overview
OTM'10 Proceedings of the 2010 international conference on On the move to meaningful internet systems
OTM'05 Proceedings of the 2005 OTM Confederated international conference on On the Move to Meaningful Internet Systems
Automated verbalization for ORM 2
OTM'06 Proceedings of the 2006 international conference on On the Move to Meaningful Internet Systems: AWeSOMe, CAMS, COMINF, IS, KSinBIT, MIOS-CIAO, MONET - Volume Part II
Object-Role Modeling: Principles and Benefits
International Journal of Information System Modeling and Design
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Fact-oriented modeling approaches such as Object-Role Modeling (ORM) have long supported several varieties of ring constraints, such as irreflexivity, asymmetry, intransitivity, and acyclicity, on pairs of compatible roles. The latest version of the Web Ontology Language (OWL 2) supports five kinds of ring constraint on binary predicates. Recently, three more ring constraint types (local reflexivity, strong intransitivity, and transitivity) were added to ORM. This paper discusses these new additions to ORM, as implemented in the Natural ORM Architect (NORMA) tool, and identifies important ways in which ORM and OWL differ in their support for ring constraints, while noting different mapping alternatives. We determine which combinations of elements from this expanded set of ring constraints are permitted, and provide verbalization patterns for the new additions. Graphical shapes for the new constraints and constraint combinations are introduced and motivated, and NORMA's new user interface for entry of ring constraints is illustrated.