class Attribute implements Serializable, Cloneable {

    @Override
    public String toString() {
        if (value != null) {
            return value.toString();
        }
        return null;
    }

    public  Attribute();
    public  Attribute(Object value);
    public  Attribute(Attribute attribute);
    public  Attribute(Object value, String role);
    public  Attribute(Object value, Expression expression, String role, String rendererName);

}