public function renderSVG($content, array $options = []) {
		$options = $options + $this->defaultOptions;

		$identifier = isset($options['identifier']) ? (string)$options['identifier'] : md5($content);

		if (!isset($this->usedSvgs[$identifier])) {
			$symbol = $this->processSVG($content, $options);
		} else {
			$symbol = $this->usedSvgs[$identifier];
		}

		return $this->renderSymbol($symbol, $options);
	}