文档介绍：A technical discussion on modeling with UML
06/11/03
Entity Relationship
Modeling with UML
Davor Gornik
Improving software development capability
2
Table of Contents
Entity Relationship Modeling............................................................................................................... 1
Core Elements of ER Modeling........................................................................................................... 1
Entity Types.............................................................................................................................................1
Attributes.................................................................................................................................................2
Relationship Types...................................................................................................................................2
Attributes of Relationship Types................................................................................................................3
Simple Constraints in ER Modeling ............................................................................................................4
Cardinality ................................................................................................................................................4
Dependency............................................................................................................................................6
Specialization and Generalization...............................................................................................................7
Specialization and Generalization...............................................................................................................7
Categorization..........................................................................................................................................8
Notations fo