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="A_spectrum_of_pleasure_2_-_8-8-12.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="65" ns="6" title="File:&#039;Spiritual&#039; dimension - 9-5-12.jpg" />
      <page pageid="175" ns="6" title="File:A continuum of states - 12-7-13.jpg" />
      <page pageid="229" ns="6" title="File:A cosmic microcosm.jpg" />
      <page pageid="207" ns="6" title="File:A cosmic replication system - 15-3-14.jpg" />
      <page pageid="37" ns="6" title="File:A fallible executive - 10-4-12.jpg" />
      <page pageid="209" ns="6" title="File:A labyrinth of circular confusion.jpg" />
      <page pageid="205" ns="6" title="File:A magnetic force - 13-1-14.jpg" />
      <page pageid="77" ns="6" title="File:A singular source - 24-6-12.jpg" />
      <page pageid="111" ns="6" title="File:A spatial structure - 12-9-12.jpg" />
      <page pageid="91" ns="6" title="File:A spectrum of pleasure - 8-8-12.jpg" />
    </pages>
  </query>
</api>