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="194_x11.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="169" ns="6" title="File:100OA.jpg" />
      <page pageid="12" ns="6" title="File:10 anniversary.jpeg" />
      <page pageid="79" ns="6" title="File:1915 single orca.jpg" />
      <page pageid="189" ns="6" title="File:194 S48 X12.png" />
      <page pageid="190" ns="6" title="File:194 S49 X13.png" />
      <page pageid="191" ns="6" title="File:194 S50 X14.png" />
      <page pageid="192" ns="6" title="File:194 S51 X15.png" />
      <page pageid="193" ns="6" title="File:194 S52.png" />
      <page pageid="194" ns="6" title="File:194 S53.png" />
      <page pageid="195" ns="6" title="File:194 S54.png" />
    </pages>
  </query>
</api>