code: public Element findElementById(final Element element) {
  		Attribute a = element.getAttribute(idAttributeName);
  		if (a == null) {
  			return null;
  		}
  		return findElementById(a.getValue());
  	}
docs: Searches the attribute id in the given element first and using this element searches for the
  element with the attribute id and the value of this element.
  
  @return the element with the id whose value is contained in the id attribute of the passed
  element
  
  @see #findElementById(String)