Fraser Speirs:
Somewhere in Aperture, it’s reading the keywords on an iPhoto image, composing a keypath from the bare string of the keyword and calling -valueForKeyPath: with that string. Further, the “@” sign has a special meaning in Key-Value Coding—it signifies an array operator—so instead of accessing the keypath “photo.keywords.Flickr,” the keypath might be “photo.keywords.@Flickr” and “@Flickr” is not a supported array or set operator in KVC.
Aperture Cocoa Key-Value Coding (KVC) Mac Programming
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