h2><a name="simple">Simple Model</a></h2>

<p>The next one is the <code>simple</code> model that adds the possibility of defining classes with simple inheritance. The <code>class</code> function of the <code>simple</code> model takes an optional second argument that defines the super-class of the class being created. Additionally, the <code>simple</code> model introduce the functions <code>superclass(class)</code> to retrieve the super-class of a given class and <code>subclassof(class, super)</code> to chec