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="Cocyrdavarin.jpeg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="3239" ns="6" title="File:20th Shirt Back.jpg" />
      <page pageid="3238" ns="6" title="File:20th Shirt Front.jpeg" />
      <page pageid="2559" ns="6" title="File:Adventurers Quarter thumb.jpg" />
      <page pageid="2995" ns="6" title="File:Beholder - Scott M. Fischer.jpg" />
      <page pageid="3015" ns="6" title="File:Blackrazor.jpg" />
      <page pageid="3237" ns="6" title="File:Blackrazor Guild 20th.jpeg" />
      <page pageid="3027" ns="6" title="File:Blackrazor Guild Arms.png" />
      <page pageid="3241" ns="6" title="File:Blackrazors Banner.png" />
      <page pageid="3140" ns="6" title="File:Carac.jpg" />
      <page pageid="2978" ns="6" title="File:Celwynvian.png" />
    </pages>
  </query>
</api>