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="Install_BeagleBone|9" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" />
      <page pageid="2" ns="0" title="Install xpl hub" />
      <page pageid="3" ns="0" title="Install serial port" />
      <page pageid="8" ns="0" title="Install Hue" />
      <page pageid="12" ns="0" title="Install AVR 3808" />
      <page pageid="23" ns="0" title="Install AVR 3808 serial" />
      <page pageid="24" ns="0" title="Install AVR 3808 telnet" />
      <page pageid="35" ns="0" title="Install Canvas" />
    </pages>
  </query>
</api>