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="006a.gif" />
  </query-continue>
  <query>
    <pages>
      <page pageid="41506" ns="6" title="File:.Marketing &amp; Presse.jpeg" />
      <page pageid="4838" ns="6" title="File:001.gif" />
      <page pageid="10856" ns="6" title="File:001 Tools Options Menu.png" />
      <page pageid="10850" ns="6" title="File:002 Use JRE.png" />
      <page pageid="10851" ns="6" title="File:003 Java Params.png" />
      <page pageid="10852" ns="6" title="File:004 XDebug param.png" />
      <page pageid="10853" ns="6" title="File:005 Xrunjdwp param.png" />
      <page pageid="3177" ns="6" title="File:005a.gif" />
      <page pageid="3178" ns="6" title="File:005b.gif" />
      <page pageid="10854" ns="6" title="File:006 NB New Proj.png" />
    </pages>
  </query>
</api>