Originally I had got the semantics of the "Visit" class in the tutorial stupidly wrong. The language used by the guide is no extra attribute, it clearly has to be a part of the embedded ID.
How do I know? Well, in the original you couldn't insert two visits from the same ZIP area to the same city, but with different languages used by the guide. You always got an update of the same record, because the ID, combining only city and ZIP, was the same.
Now we have an association between three entities, City, Zip and Language, all three contributing their respective IDs to the embedded ID, and the "numberOfVisitors" has become a "totalNumberOfVisitors". Whenever new data about a visit comes in, we look if an instance of Visit already exists. If so, we increment its total number of visitors, otherwise we create a new object. Maybe I should even call the class not Visit but VisitStats or something like that.
I have not made a new release, but I have already updated the documentation, the tutorial as well as doc.zip, the archive that also contains sample sources. You would have got it with the next release, but I figure it is bad style keeping nonsense on the web as soon as you recognize it's nonsense :)
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