title: GWT panels and widgets
body: <p>Is it safe to conclude the basic relationships among GWT panels and widgets below?</p>
  
  <ul>
  <li>A GWT panel is translated into a parent DOM node that can contain child panels or/and child widgets.</li>
  <li>A GWT widget is translated into a leaf DOM node that is merely self-contained.</li>
  <li>GWT RootPanel must solely act as the root container of all other panels and widgets.</li>
  </ul>