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>
    <allfileusages gafcontinue="Basteldonnerstag.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="299" ns="6" title="File:B-Finale 2011 IMPR.jpg" />
      <page pageid="4482" ns="6" title="File:BCBoesch-IDS-Parametrisierung.pdf" />
      <page pageid="14740" ns="6" title="File:BRM 90130 Colourful control pannel manual.pdf" />
      <page pageid="14739" ns="6" title="File:BRM 90130 Cutting parameter.pdf" />
      <page pageid="14736" ns="6" title="File:BRM 90130 Gebrauchsanleitung.pdf" />
      <page pageid="14738" ns="6" title="File:BRM 90130 Maintaince manual.pdf" />
      <page pageid="14084" ns="6" title="File:BTListe wiki.jpg" />
      <page pageid="7817" ns="6" title="File:Back2hack black.png" />
      <page pageid="16673" ns="6" title="File:Bandsaege.jpg" />
      <page pageid="2964" ns="6" title="File:Banner indie.jpg" />
    </pages>
  </query>
</api>