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>
    <allpages apcontinue="How_to_configure_Active_Directory_Diagnostic_Event_Logging" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="6" ns="0" title="Change Log" />
      <p pageid="7" ns="0" title="Changing SQL Server Backup Directory for Local SQL Servers" />
      <p pageid="8" ns="0" title="Checking Server Performance with Windows Media Load Simulator" />
      <p pageid="9" ns="0" title="Configure Wowza Streaming Server" />
      <p pageid="10" ns="0" title="Configuring Windows Media Services and IIS on a dual NIC Server" />
      <p pageid="11" ns="0" title="Database" />
      <p pageid="12" ns="0" title="Ensemble Video Wiki" />
      <p pageid="13" ns="0" title="Example of embedding a video" />
      <p pageid="14" ns="0" title="Fixing Slow Application Startups" />
      <p pageid="15" ns="0" title="Hinting Quicktime and MPEG-4 videos for streaming" />
    </allpages>
  </query>
</api>