private static function buildMetasTags() :string {
		// this is where formatted meta tags go
		$metas = '';
		// for each available meta
		foreach(self::$_metas as $name => $content) {
			// add the formated the meta
			$metas .= '<meta name="'.$name.'" content="'.\Polyfony\Format::htmlSafe($content).'" />';
		}
		return $metas;

	}