nodeSpacing: 3 })
    });

    // Define a node template showing class names.
    // Clicking on the node opens up the documentation for that class.
    diagram.nodeTemplate = new go.Node("Auto")
      .add(
        new go.Shape({ fill: '#1F4963', stroke: null }),
        go.GraphObject.build('HyperlinkText', {
            font: 'bold 13px Helvetica, bold Arial, sans-serif',
            stroke: 'white',
            margin: 3
          },
          // compute the URL to open for the documentation
          (