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="1864-3.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2352" ns="6" title="Fil:(64) Jens Emborg.jpgl.jpg" />
      <page pageid="2853" ns="6" title="Fil:001 schultz.jpg" />
      <page pageid="2854" ns="6" title="Fil:002 schultz.jpg" />
      <page pageid="2855" ns="6" title="Fil:003 schultz 3.jpg" />
      <page pageid="2839" ns="6" title="Fil:12c. B69597.jpg" />
      <page pageid="2862" ns="6" title="Fil:1710 isak pedersen.jpg" />
      <page pageid="2720" ns="6" title="Fil:1799.JPG" />
      <page pageid="468" ns="6" title="Fil:180px-Sctnint.jpg" />
      <page pageid="822" ns="6" title="Fil:1864-1.jpg" />
      <page pageid="823" ns="6" title="Fil:1864-2.jpg" />
    </pages>
  </query>
</api>