protected function addFileModificationImprintToHrefUrl ($url, $path) {
		$questionMarkPos = strpos($url, '?');
		$separator = ($questionMarkPos === FALSE) ? '?' : '&';
		$strippedUrl = $questionMarkPos !== FALSE ? substr($url, $questionMarkPos) : $url ;
		$srcPath = $this->getAppRoot() . substr($strippedUrl, strlen(self::$basePath));
		if (self::$globalOptions['fileChecking'] == 'filemtime') {
			$fileMTime = self::getFileImprint($srcPath);
			$url .= $separator . '_fmt=' . date(
				self::FILE_MODIFICATION_DATE_FORMAT,
				(int)$fileMTime
			);
		} else {
			$url .= $separator . '_md5=' . self::getFileImprint($srcPath);
		}
		return $url;
	}