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="Altc_masterlogo_sml_0.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="585" ns="6" title="File:137425 Brochure h res.pdf" />
      <page pageid="411" ns="6" title="File:2011ACM MyAuthor.png" />
      <page pageid="298" ns="6" title="File:2011VerhaartWikipediaAnatomy v1.png" />
      <page pageid="636" ns="6" title="File:2013vmvWikiSpam.png" />
      <page pageid="20" ns="6" title="File:783.JPG" />
      <page pageid="595" ns="6" title="File:ACEC2012 DEHub final.pdf" />
      <page pageid="90" ns="6" title="File:ALTC Project proposal.pdf" />
      <page pageid="590" ns="6" title="File:Activity Systems in project.jpg" />
      <page pageid="589" ns="6" title="File:Activity Theory.jpg" />
      <page pageid="329" ns="6" title="File:Advisory Group Principles of Engagement.pdf" />
    </pages>
  </query>
</api>