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RE>Waldo interface

Making XuText, Doc, etc. subclasses of Waldo rather than
IndexedWrapper and RestrictedWrapper respectively would not be a good
soluction because it defeats the purpose of the class structure, to
simplify things through modularity. It would require reimplementing
gobs of messages and losing polymorphism. Note that the two wrapper
classes add semantics without any new public protocol, so that to a
user of the classes they don't add any overhead.