tifies data property names
        nodeDataArray: [
          { key: 1, text: "Add1" },
          { key: 2, text: "Add2" },
          { key: 3, text: "Subtract1" }
        ],
        linkDataArray: [
          // no predeclared links
        ] });
</code></pre>
<script>goCode("linkablePorts", 600, 250)</script>
<p>
  By default the user may not draw more than one link in the same direction between any pair of ports,
  nor may the user draw a link connecting a node with itself.
  Please read a general discus