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="BBB_PRU" />
  </query-continue>
  <query>
    <pages>
      <page pageid="286" ns="0" title="BBB Backup your work" />
      <page pageid="268" ns="0" title="BBB Cross Compiler" />
      <page pageid="287" ns="0" title="BBB Customised prompt" />
      <page pageid="271" ns="0" title="BBB Developing Device Drivers" />
      <page pageid="273" ns="0" title="BBB Enabling PWM" />
      <page pageid="264" ns="0" title="BBB First Boot" />
      <page pageid="275" ns="0" title="BBB Internet over the USB cable" />
      <page pageid="277" ns="0" title="BBB Kernel Modules" />
      <page pageid="270" ns="0" title="BBB New Debian Image" />
      <page pageid="295" ns="0" title="BBB New User" />
    </pages>
  </query>
</api>