code: @Override
      public void renderLine( PositionedText target, double x, double y,
                              Size size, List<Diagram.Figure> sequence, boolean forward )
      {
          throw new UnsupportedOperationException( "not implemented" );
      }
docs: <b>Example:</b>
  <pre><code>
  o-&gt;|alpha|-&gt;(,)-&gt;|beta|-&gt;o
  </code></pre>