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="Activation_2.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="117" ns="6" title="File:AccountPropertyData-2014-05-05 1657.png" />
      <page pageid="7" ns="6" title="File:Account Open.png" />
      <page pageid="12" ns="6" title="File:Account Open1.png" />
      <page pageid="8" ns="6" title="File:Account Open EventBuffer.png" />
      <page pageid="9" ns="6" title="File:Account Open Reports.png" />
      <page pageid="10" ns="6" title="File:Account Open System.png" />
      <page pageid="11" ns="6" title="File:Account Open Users.png" />
      <page pageid="58" ns="6" title="File:AccountisSync 2014-05-05 1229.png" />
      <page pageid="59" ns="6" title="File:ActivationKeyForm 2014-05-05 1036.png" />
      <page pageid="44" ns="6" title="File:Activation 1.png" />
    </pages>
  </query>
</api>