code: public List<Element> append(String name, Collection<String> values) {
  		List<Element> elements = new ArrayList<Element>(values.size());
  		for (String value : values) {
  			elements.add(append(name, value));
  		}
  		return elements;
  	}
docs: Adds multiple child elements, each with the same name.
  @param name the name for all the child elements
  @param values the values of each child element
  @return the created elements