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Nat Pryce
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Basically, this "pattern" lets an object provide its own protocol for externalising and internalising its "fundamental" state -- the state that makes the object what it is, without extra state that it needs to implement application behaviour. Displaying fundamental state in a user interface or acquiring it from user input is only one use for these interfaces. They could also be used to externalise an object onto an output stream, into an XML document or into a database table.
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