You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages gaifrom="Boss Ce-20 Dimensional Processor Chorus Ensemble Back.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1668" ns="6" title="File:50th-Anniversary-1960-ES-335-TD-Finish-Shot.jpg" />
      <page pageid="1677" ns="6" title="File:50th Anniversary 1960 ES-335TD-unboxed.jpg" />
      <page pageid="1676" ns="6" title="File:50th Anniversary 1960 ES-335TD-unboxing1.jpg" />
      <page pageid="2362" ns="6" title="File:777-9311-drum-pattern.jpg" />
      <page pageid="1680" ns="6" title="File:AFM carryon.pdf" />
      <page pageid="1836" ns="6" title="File:Andy Summers Tele.pdf" />
      <page pageid="1699" ns="6" title="File:Another Roadside Attraction.jpg" />
      <page pageid="1490" ns="6" title="File:Apple Pro Training Series Logic Pro 9 and Logic Express 9.jpg" />
      <page pageid="2292" ns="6" title="File:Billboard Hot 100 Best Songs 2011 Tempo Map.png" />
      <page pageid="1564" ns="6" title="File:Boss BD-2 Blues Driver.jpg" />
    </pages>
  </query>
</api>