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<p><a href="page.php?w=Conceptual_schema">conceptual data models</a> by providing graphical notations which document <a href="page.php?w=entity_class">entities</a> and their <a href="page.php?w=Relational_model">relationship</a>s, and the <a href="page.php?w=Integrity_constraints">constraint</a>s that bind them. The basic graphic elements of DSDs are <a href="page.php?w=box">box</a>es, representing entities, and <a href="page.php?w=arrow">arrow</a>s, representing relationships. Data structure diagrams are most useful for documenting complex data</p><p>
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