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>
    <allimages gaicontinue="1962_Studebaker_Hawk.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="8590" ns="6" title="File:&#039;Tis the Season To Be Jelly Cover.jpg" />
      <page pageid="8354" ns="6" title="File:0074642404922.jpg" />
      <page pageid="6944" ns="6" title="File:07-Aark N.jpg" />
      <page pageid="8787" ns="6" title="File:102 TheCruxOfTheBiscuit1500.jpg" />
      <page pageid="8789" ns="6" title="File:105 FrankZappaforPresident1500.jpg" />
      <page pageid="8785" ns="6" title="File:108 Chicago78-coverSQ.jpg" />
      <page pageid="8783" ns="6" title="File:109 Little-Dots-SQcover.png" />
      <page pageid="7593" ns="6" title="File:12.854.jpg" />
      <page pageid="7664" ns="6" title="File:12915.jpg" />
      <page pageid="7694" ns="6" title="File:184190 91.jpg" />
    </pages>
  </query>
</api>