public function fetchHTTPPersistentVariables()
    {
        $translations = $this->allTranslations();

        $http = eZHTTPTool::instance();
        eZHTTPPersistence::fetch( 'ContentObjectState' , eZContentObjectState::definition(), $this, $http, false );
        eZHTTPPersistence::fetch( 'ContentObjectState' , eZContentObjectStateLanguage::definition(), $translations, $http, true );
    }