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5. Adding Dependency Relationships:
 The UML includes a general dependency relationship
which indicates that one element has knowledge of
another element.
 It is illustrated with a dashed arrowed line.
 In class diagrams the dependency relationship is
useful to depict non-attribute visibility between
 In other words, parameter, global, or locally declared
 For example, the POST software object receives a
return object of type ProductSpecification from the
specification message it sent to a ProductCatalog