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="Application_pen_test_1208.jpg" />
  </query-continue>
  <query>
    <pages>
      <page ns="6" title="File:Access door 2998.jpg" missing="" />
      <page ns="6" title="File:Accounting services 1911.jpg" missing="" />
      <page ns="6" title="File:Acer Aspire Timeline repair in north york 947.jpg" missing="" />
      <page ns="6" title="File:Acer Aspire repair in richmond hill 4804.jpg" missing="" />
      <page ns="6" title="File:Acer repair centre in toronto 1116.jpg" missing="" />
      <page ns="6" title="File:Acne Red Marks 5587.jpg" missing="" />
      <page ns="6" title="File:Adonis Golden Ratio review 4408.jpg" missing="" />
      <page ns="6" title="File:Albumes de fotos 3383.jpg" missing="" />
      <page ns="6" title="File:Anavar side effects 2632.jpg" missing="" />
      <page pageid="1451" ns="6" title="File:45px-Padlock.png" />
    </pages>
  </query>
</api>