docs: public static Element getElement(Element element, String tagName) {
  		final NodeList nodeList = element.getElementsByTagName(tagName);
  		if (nodeList == null || nodeList.getLength() < 1) {
  			return null;
  		}
  		int length = nodeList.getLength();
  		for (int i = 0; i < length; i++) {
  			Element childEle = (Element) nodeList.item(i);
  			if (childEle == null || childEle.getParentNode() == element) {
  				return childEle;
  			}
  		}
  		return null;
  	}