protected function _execute()
 {
     $env_res = new RESOURCE_MANAGER();
     $env_res->root_url = 'http://earthli.com';
     $page_res = new RESOURCE_MANAGER();
     $page_res->root_url = '/site_root/home/users/~bob/';
     $page_res->inherit_resources_from($env_res);
     $page_res->set_path('root', '/');
     $page_res->set_path('resources', '{root}/resources');
     $page_res->set_path('pictures', '{resources}/pictures');
     $page_res->set_path('external', '/external/software');
     $page_res->set_path('attachments', 'attachments');
     $page_res->set_path('entry_attachments', '{attachments}/entry');
     $page_res->set_path('logs', '/var/log');
     $page_res->set_forced_root('logs', false);
     $page_res->set_extension('pictures', 'png');
     $page_res->set_extension('external', 'zip');
     $app_res = new RESOURCE_MANAGER();
     $app_res->inherit_resources_from($page_res);
     $app_res->root_url = 'albums/';
     $this->_check_basic_aliases($app_res);
     $this->_check_basic_aliases($page_res);
     $this->_check_force_root_override($page_res, $app_res);
     $this->_check_force_root_default($env_res, $page_res, $app_res);
 }