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Alle elementer bør vises i et diagram. Ofte gjemmer det seg multippel arv, glemte assosiasjoner og lignende når et element ikke vises i et diagram
Requirement 17. All package dependencies shall be shown in one or more package diagrams for each package.
Requirement 18. All classifiers shall be documented in a "context diagram" where all attributes, operations and all relationships that are navigable from the central classifier are displayed.