/**
    * Return a list of every page that could be cached
    */
   function allPagesToCache() {
      $urls = array();
      $pages = DataObject::get("Page");

      foreach($pages as $page) {
         $urls[] = $page->Link();
      }
      
      return $urls;
   }

   /**
   *Return a list of all the pages to cache
   */
   function allPagesToCache() {
      // Get each page type to define its sub-urls
      $urls = array();
   
      // memory intensive depending on number of pages
      $pages = DataObject::get("SiteTree");
      //print_r($pages);
      foreach($pages as $page) {
         $urls = array_merge($urls, (array)$page->subPagesToCache());
      }
   
      // add any custom URLs which are not SiteTree instances
      $urls[] = "sitemap.xml";
   
      return $urls;
   }
   /**
   * Get a list of URLs to cache related to this page
   */
   function subPagesToCache() {
      $urls = array();
   
      // add current page
      $urls[] = $this->Link();
   
      // cache the RSS feed if comments are enabled
      if ($this->ProvideComments) {
         $urls[] = Director::absoluteBaseURL() . "pagecomment/rss/" . $this->ID;
      }
   
      return $urls;
   }