Data structure diagrams are most useful for documenting complex data entities.
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Each input and output is modelled as a separate Data Structure Diagram ( DSD ).
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Data structure diagrams are an extension of the entity-relationship model ( ER model ).
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The data structure diagrams is a predecessor of the entity-relationship model ( E-R model ).
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There are several styles for representing data structure diagrams, with the notable difference in the manner of defining crow's feet ), or numerical representation of the cardinality.