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>
  <warnings>
    <allimages xml:space="preserve">ailimit may not be over 500 (set to 2000) for users</allimages>
  </warnings>
  <query>
    <allimages>
      <img name="20131217-00016.png" size="5658112" width="1488" height="1828" url="http://primusdatabase.com/images/9/95/20131217-00016.png" descriptionurl="http://primusdatabase.com/index.php?title=File:20131217-00016.png" mime="image/png" ns="6" title="File:20131217-00016.png" />
      <img name="Aentheartist_-_Clownface.jpg" size="5649905" width="2480" height="3252" url="http://primusdatabase.com/images/f/fc/Aentheartist_-_Clownface.jpg" descriptionurl="http://primusdatabase.com/index.php?title=File:Aentheartist_-_Clownface.jpg" mime="image/jpeg" ns="6" title="File:Aentheartist - Clownface.jpg" />
      <img name="Cobaltkid_crushgirl.png" size="5455018" width="2048" height="2628" url="http://primusdatabase.com/images/d/d4/Cobaltkid_crushgirl.png" descriptionurl="http://primusdatabase.com/index.php?title=File:Cobaltkid_crushgirl.png" mime="image/png" ns="6" title="File:Cobaltkid crushgirl.png" />
      <img name="Eternal_Cover_A_by_Chou_Roninx.jpg" size="6149057" width="2700" height="3300" url="http://primusdatabase.com/images/f/fe/Eternal_Cover_A_by_Chou_Roninx.jpg" descriptionurl="http://primusdatabase.com/index.php?title=File:Eternal_Cover_A_by_Chou_Roninx.jpg" mime="image/jpeg" ns="6" title="File:Eternal Cover A by Chou Roninx.jpg" />
      <img name="Eternals_Cover_B_by_Chou_Roninx.jpg" size="5754931" width="2700" height="3300" url="http://primusdatabase.com/images/0/05/Eternals_Cover_B_by_Chou_Roninx.jpg" descriptionurl="http://primusdatabase.com/index.php?title=File:Eternals_Cover_B_by_Chou_Roninx.jpg" mime="image/jpeg" ns="6" title="File:Eternals Cover B by Chou Roninx.jpg" />
      <img name="Liberatorsgjet.png" size="5328848" width="2500" height="1695" url="http://primusdatabase.com/images/1/11/Liberatorsgjet.png" descriptionurl="http://primusdatabase.com/index.php?title=File:Liberatorsgjet.png" mime="image/png" ns="6" title="File:Liberatorsgjet.png" />
      <img name="Mungorite_Guard.png" size="5876585" width="1916" height="2156" url="http://primusdatabase.com/images/a/a6/Mungorite_Guard.png" descriptionurl="http://primusdatabase.com/index.php?title=File:Mungorite_Guard.png" mime="image/png" ns="6" title="File:Mungorite Guard.png" />
      <img name="Shanghaishowdown.png" size="5882078" width="1400" height="1050" url="http://primusdatabase.com/images/f/f5/Shanghaishowdown.png" descriptionurl="http://primusdatabase.com/index.php?title=File:Shanghaishowdown.png" mime="image/png" ns="6" title="File:Shanghaishowdown.png" />
      <img name="Slicer.png" size="5853282" width="1565" height="2193" url="http://primusdatabase.com/images/e/ee/Slicer.png" descriptionurl="http://primusdatabase.com/index.php?title=File:Slicer.png" mime="image/png" ns="6" title="File:Slicer.png" />
      <img name="Sphinx.gif" size="6163769" width="680" height="260" url="http://primusdatabase.com/images/f/fa/Sphinx.gif" descriptionurl="http://primusdatabase.com/index.php?title=File:Sphinx.gif" mime="image/gif" ns="6" title="File:Sphinx.gif" />
      <img name="TNoEscape.png" size="5503134" width="1988" height="2760" url="http://primusdatabase.com/images/f/fc/TNoEscape.png" descriptionurl="http://primusdatabase.com/index.php?title=File:TNoEscape.png" mime="image/png" ns="6" title="File:TNoEscape.png" />
    </allimages>
  </query>
</api>