You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages gaifrom="All News.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="207" ns="6" title="File:400px-Choose file.JPG" />
      <page pageid="209" ns="6" title="File:400px-Watchlist changes.JPG" />
      <page pageid="210" ns="6" title="File:450px-All pages.JPG" />
      <page pageid="211" ns="6" title="File:530px-My preferences.JPG" />
      <page pageid="212" ns="6" title="File:530px-Preferences.jpg" />
      <page pageid="213" ns="6" title="File:550px-Date and time.jpg" />
      <page pageid="214" ns="6" title="File:550px-Misc.JPG" />
      <page pageid="215" ns="6" title="File:650px-Toolbar.JPG" />
      <page pageid="300" ns="6" title="File:Account.png" />
      <page pageid="343" ns="6" title="File:Add new entry to Newsblog.jpg" />
    </pages>
  </query>
</api>