The Default Visitor Pattern is a version of the classic VisitorPattern defined by Martin E. Nordberg in a paper called VariationsOnTheVisitorPattern.  It basically shows how to provide a default implementation or TemplateMethod of a classic VisitorPattern so that others can easily create derivatives.

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Please help describe this useful pattern.  I would provide a more detailed explaniation, but I am swamped by work!  -- JimmyCerra 20050913

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CategoryPattern