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>
    <alltransclusions gatcontinue="Band|25" />
  </query-continue>
  <query>
    <pages>
      <page pageid="3" ns="0" title="13th hour" />
      <page pageid="5" ns="0" title="2,000 B.C." />
      <page pageid="8" ns="0" title="21 Gun Fun" />
      <page pageid="9" ns="0" title="24 Days" />
      <page pageid="11" ns="0" title="3 Count" />
      <page pageid="12" ns="0" title="3F Innovasion" />
      <page pageid="13" ns="0" title="3" />
      <page pageid="14" ns="0" title="420" />
      <page pageid="16" ns="0" title="4 Holy Fools" />
      <page pageid="24" ns="0" title="A Call To Arms" />
    </pages>
  </query>
</api>