OCL21 — last line on page 28

The last line on page 28 is an example in Java-like code that is supposed to show the accumulation of values into a Bag. The line currently is acc = <expression-with-elem-and-acc> Since such an assignment would not add to the Bag, but more likely produce a compile error in Java, I would think use of the common method name "add" would be more appropriate: acc.add(<expression-with-elem-and-acc>);

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