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Mentioning this here because it’s hard to find with Google unless you speak Japanese. has a good example of drag and drop in a NSTableView powered by CoreData. - in English - drag and drop example code with e-mail entities - example code, if you need different ordering in each of several categories (adding an “ordered e-mail” wrapper entity)

(Sorry for the lousy formatting. Just wanted to make this googleable; no time to learn the formatting right now.)