You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <alllinks galcontinue="Download_PlayGo|179" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="PlayGo" />
      <page pageid="7" ns="0" title="Startup PlayGo" />
      <page pageid="17" ns="0" title="What You Can Do with the Provided Workspace" />
      <page pageid="46" ns="0" title="Tracer&#039;s gallery" />
      <page pageid="95" ns="0" title="Troubleshoot" />
      <page pageid="96" ns="0" title="How to Play In" />
      <page pageid="102" ns="0" title="PlayGo Examples" />
      <page pageid="106" ns="0" title="Baby Monitor Specification" />
      <page pageid="123" ns="0" title="Instructions for creating LSC project from LSC file" />
    </pages>
  </query>
</api>