Here's an article about it written in English: http://www.thelocal.se/36104/20110913/
Honestly, I wasn't even aware that some countries in EU allows corporal punishment on children... I kinda thought that was a third world thing nowadays.
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Anyway its apparently a discussion with quite the controversy, to me its just plain wrong to do it while Italians for example are baffled about our law against it. I just can't see what good it can make to slap your child... and imo those that do doesn't know what parenting really is.