Visitor Design Pattern

My team had to develop a component using Visitor pattern. Since i have not gone thru this pattern for quite some time, i searched in GOOGLE and found some interesting links.
Visitor Defintion:
The visitor pattern allows you to define new, polymorphic operations on a class structure, without touching the source code for the classes themselves. Visitor lets you define a new operation without changing the classes of the elements on which it operates.
Useful Links on Visitor Pattern

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