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=== Attribute-free ===
ORM is attribute-free : unlike models in [[Entity-relationship model|
Entity Relationship]] (ER) and [[Unified Modeling Language]] (UML)
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.
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