>Auxiliary classes resemble, to a certain degree, interfaces in programming languages.</p>
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<h2 id="inheritance"><a class="header" href="#inheritance">Inheritance</a></h2>
<p>The special thing about classes is that they can inherit from one another. This is done by specifying the parent of the class in its <code>subclassOf</code> attribute. Inheritance works by implicitly including the values of the <code>mustContain</code>, <code>systemMustContain</code>, <code>mayContain</code>, <code>systemM