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>
    <allfileusages gafcontinue="Jennifer_finds_her_bathing_suit.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1510" ns="6" title="File:Baptism.JPG" />
      <page pageid="1522" ns="6" title="File:Bobbing for apples.JPG" />
      <page pageid="1524" ns="6" title="File:Climbing.jpg" />
      <page pageid="1448" ns="6" title="File:DSCF0040 sunset.jpg" />
      <page pageid="1318" ns="6" title="File:Daddy comes home.jpg" />
      <page pageid="1517" ns="6" title="File:Deer behind our home.JPG" />
      <page pageid="1411" ns="6" title="File:Email and phone.png" />
      <page pageid="1317" ns="6" title="File:Going swimming.jpg" />
      <page pageid="1711" ns="6" title="File:J4h.png" />
      <page pageid="1754" ns="6" title="File:Jatd cropped.jpg" />
    </pages>
  </query>
</api>