Object–role modeling: Difference between revisions

Revision as of 02:25, 26 July 2018

Revision as of 11:09, 4 August 2018

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=== Attribute-free ===

ORM is attribute-free: unlike models in the [[Entity–relationship model|entity–relationship]] (ER) and [[Unified Modeling Language]] (UML) methods, ORM treats all elementary facts as relationships and so treats decisions for grouping facts into structures (e.g. attribute-based entity types, classes, relation schemes, XML schemas) as implementation concerns irrelevant to semantics. By avoiding attributes in the base model, ORM improves semantic stability and enables verbalization into natural language.

=== Fact-based modeling ===