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="Adolf.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1074" ns="6" title="Fil:2047 325x216.jpg" />
      <page pageid="1254" ns="6" title="Fil:2181 325x236.jpg" />
      <page pageid="1159" ns="6" title="Fil:2637 325x216.jpg" />
      <page pageid="1253" ns="6" title="Fil:2641 325x216.jpg" />
      <page pageid="265" ns="6" title="Fil:2648 325x212 stenpilsgaard.jpg" />
      <page pageid="874" ns="6" title="Fil:2671 225x257.jpg" />
      <page pageid="1518" ns="6" title="Fil:2677 125x176.jpg" />
      <page pageid="277" ns="6" title="Fil:2806 ørnebjerggård.jpg" />
      <page pageid="273" ns="6" title="Fil:2837 325x215 udlejregaard.jpg" />
      <page pageid="762" ns="6" title="Fil:Abstrakt.jpg" />
    </pages>
  </query>
</api>