code: private Element getChildElement(Element parent) {
  	NodeList list = parent.getChildNodes();
  	int len = list.getLength();
  	for (int i = 0; i < len; i++) {
  	    Node node = list.item(i);
  	    if (node instanceof Element) {
  		return (Element) node;
  	    }
  	}
  	return null;
      }
docs: return fitst child Element of a Element, if there are no child Elements return null
  
  @param parent parent node
  @return child Element