class Elements implements List<Element>, Cloneable {

    public String val() {
        if (size() > 0)
            return first().val();
        else
            return "";
    }

    public  Elements();
    public  Elements(int initialCapacity);
    public  Elements(Collection<Element> elements);
    public  Elements(List<Element> elements);
    public  Elements(Element... elements);

}