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Protocol to provide a viewpoint that simulates mutability for immutable objects.

Overview

For each immutable object class, a distinct ETMutableObjectViewpoint subclass must exist.

Immutable object class that wants to support editing or mutation through a ETMutableObjectViewpoint must implement this protocol.

+ (Class) mutableViewpointClass

Returns the ETMutableObjectViewpoint subclass used to mutate the receiver instances.

Must not return Nil.