<?php
public function __construct($app = null, $menu = null)
{
  // If your view takes a URL identifier, like the &id= parameter of the
  // article view of com_content, you have to set the name of that identifier
  // variable in your $view object with $view->setKey().
  $category = new RouterViewConfiguration('category');
  $category->setKey('id')->setNestable();
  $this->registerView($category);
  
  // If your view also has a parent view, like an article view which can
  // be reached via a category view, you then have to define the parent view
  // of $view.
  $article = new RouterViewConfiguration('article');
  $article->setKey('id')->setParent($category, 'catid');
  $this->registerView($article);
  
  parent::__construct($app, $menu);
  
  // implements the Itemid lookup for your router
  $this->attachRule(new MenuRules($this));
  
  // implements the current behavior of the Joomla core components
  $this->attachRule(new StandardRules($this));
  
  // implements the behavior when no Itemid is present after the Itemid lookup
  $this->attachRule(new NomenuRules($this));
}