org.eclipse.pde/intro/overviewExtensionContent.xml

<?xml version="1.0" encoding="UTF-8" ?>
<introContent>
  <!-- Extension to the SDK Overview Page. -->
  <extensionContent alt-style="css/swt.properties" style="css/overview.css" path="overview/page-content/overview-links/pdeAnchor">
    <link label="Eclipse plug-in development" url="http://org.eclipse.ui.intro/showHelpTopic?id=/org.eclipse.pde.doc.user/guide/pde.htm&amp;embed=true" id="pde">
      <text>Learn how to extend Eclipse by building new plug-ins</text>
    </link>
  </extensionContent>
</introContent>