| http://www.w3.org/ns/prov#value | - In Java, Boolean is a class, not a simple type like bool, so:</p><ol start=1><li>The != operator tests whether the two object references refer to the same object; it does not check whether the two object references refer to objects with the same value.</li><li>Object references might be null, which you don't account for.</li></ol><p>Someone has already beaten me to suggest the following repl
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