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="Action_download_branch.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1085" ns="6" title="File:.net Framework4.01.png" />
      <page pageid="1086" ns="6" title="File:.net Framework4.02.png" />
      <page pageid="1087" ns="6" title="File:.net Framework4.03.png" />
      <page pageid="1194" ns="6" title="File:ACMManager.png" />
      <page pageid="1865" ns="6" title="File:AR Navigation.png" />
      <page pageid="2848" ns="6" title="File:AUGMENSYS slide.jpg" />
      <page pageid="2853" ns="6" title="File:AUGMENSYS slide alpha.png" />
      <page pageid="2719" ns="6" title="File:Action ar nav.png" />
      <page pageid="2809" ns="6" title="File:Action commit.png" />
      <page pageid="2715" ns="6" title="File:Action create content.png" />
    </pages>
  </query>
</api>