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Object–role modeling
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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, ORM improves semantic stability and enables verbalization into natural language.
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