ode class="computeroutput"><span class="identifier">employee_class</span></code>
        from our <code class="computeroutput"><span class="identifier">error_handler</span></code>. By
        doing so, we tell X3 that we want to call our <code class="computeroutput"><span class="identifier">error_handler</span></code>
        whenever an exception is thrown somewhere inside the <code class="computeroutput"><span class="identifier">employee</span></code>
        rule and whatever else it calls (i.e. the <cod