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Logical Data Model
Logical data models help to define the detailed structure of the data elements in a system and the relationships between data elements. They refine the data elements introduced by a Conceptual data model and form the basis of the Physical data model. In Enterprise Architect, a Logical data model is typically represented using the UML Class notation.
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A simple example of a Logical data model is provided below. Note that the data elements Sales Person and Customer contain UML Attributes; the Attribute types, however, remain platform-independent.
 A Logical data model defined using UML Class notation
Platform-specific Attribute types and other meta-data that relate to a specific DBMS implementation are defined by the Physical data model.
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