One or Two-pass visitor ?

When you need to first traverse all elements before working on their associations, you need a two-pass visitor :

• a first visitor, where visit_<uml_element> methods are redefined, inheriting from NODE_VISITOR

• a second one, where visit_association is redefined, inheriting from ASSOCIATION_VISITOR

? CDIF_GENERATOR is an example of such a 2-pass visitor

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