It is often useful to create one or two subclasses of BasePage specific to your application. Often your application will have a consistent navigational border on some or all pages that can be supported by the base class. Many applications have one set of pages that are visible to unidentified guests, and a second section that is visible once the user logs in. A base class for the second set of pages could override the validate() method to redirect to a login page if the user is not already logged in.