You want to:
- Hide concrete classes from the client.
- Add and remove new classes (via prototypes) at runtime.
- Keep the number of classes in the system to a minimum.
- Adapt to changing structures of data at runtime.
Because:
- In C# 3.0, cloning by deep copying is absolutely straightforward.
Consider using this pattern:
- With the Composite pattern, to provide archiving.
- Instead of the Factory Method pattern, when subclasses start proliferating.
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