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Message: [QUOTE="Tom Anderson, post: 4199589"] Except there's no way to retrieve the value from the Set later! We've been round this one before - the idea that sets might support some sort of 'get' or 'canonicalize' method to do just that. Mind you, with an embedded key, i'm not sure how you'd do lookups even with a map. To retrieve some object, wouldn't you need to have it to hand in the first place, to be able to pass in its embedded key? Or would you also support lookup by freestanding key? tom [/QUOTE]