point is coincident to the first point.</li>
   <li>  or by clicking the <kbd>right mouse button</kbd>,  for an open polygon. </li>
   <li>  or by hitting the <kbd>Return</kbd> key, for a closed polygon
         (this can be done also by clicking the last point coincident to the first polygon point).</li>
   </ul>
  <p>
  A <kbd>fill=true</kbd> attribute may be given to have the shape filled with the layer fill style.
  </p>
  <img src="xschem_polygons.png">
  <h3> CIRCLES / ARCS </h3>
  <p> 
   Arcs may be