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 aistart="2012-12-15T06:21:55Z" />
  </query-continue>
  <query>
    <allimages>
      <img name="Flare.jpg" timestamp="2013-05-04T23:09:12Z" user="Dragoon" url="http://postnukerp.com/wiki/images/3/31/Flare.jpg" descriptionurl="http://postnukerp.com/wiki/index.php/File:Flare.jpg" ns="6" title="File:Flare.jpg" />
      <img name="Fusion_Batt.jpg" timestamp="2013-05-04T22:53:49Z" user="Dragoon" url="http://postnukerp.com/wiki/images/5/5c/Fusion_Batt.jpg" descriptionurl="http://postnukerp.com/wiki/index.php/File:Fusion_Batt.jpg" ns="6" title="File:Fusion Batt.jpg" />
      <img name="PAR.jpg" timestamp="2013-05-04T22:53:31Z" user="Dragoon" url="http://postnukerp.com/wiki/images/0/0c/PAR.jpg" descriptionurl="http://postnukerp.com/wiki/index.php/File:PAR.jpg" ns="6" title="File:PAR.jpg" />
      <img name="Birds.jpg" timestamp="2013-05-04T22:53:12Z" user="Dragoon" url="http://postnukerp.com/wiki/images/e/eb/Birds.jpg" descriptionurl="http://postnukerp.com/wiki/index.php/File:Birds.jpg" ns="6" title="File:Birds.jpg" />
      <img name="Booze.jpg" timestamp="2013-05-04T22:52:51Z" user="Dragoon" url="http://postnukerp.com/wiki/images/0/0e/Booze.jpg" descriptionurl="http://postnukerp.com/wiki/index.php/File:Booze.jpg" ns="6" title="File:Booze.jpg" />
      <img name="Download.jpg" timestamp="2013-01-24T05:20:06Z" user="Remnant John" url="http://postnukerp.com/wiki/images/6/65/Download.jpg" descriptionurl="http://postnukerp.com/wiki/index.php/File:Download.jpg" ns="6" title="File:Download.jpg" />
      <img name="4000_screenshots_2013-01-23_00008.jpg" timestamp="2013-01-24T04:58:01Z" user="Remnant John" url="http://postnukerp.com/wiki/images/9/96/4000_screenshots_2013-01-23_00008.jpg" descriptionurl="http://postnukerp.com/wiki/index.php/File:4000_screenshots_2013-01-23_00008.jpg" ns="6" title="File:4000 screenshots 2013-01-23 00008.jpg" />
      <img name="GrubEgg.jpg" timestamp="2012-12-15T08:03:52Z" user="Dragoon" url="http://postnukerp.com/wiki/images/b/bb/GrubEgg.jpg" descriptionurl="http://postnukerp.com/wiki/index.php/File:GrubEgg.jpg" ns="6" title="File:GrubEgg.jpg" />
      <img name="PetHeadcrabs.jpg" timestamp="2012-12-15T06:30:09Z" user="Dragoon" url="http://postnukerp.com/wiki/images/f/f1/PetHeadcrabs.jpg" descriptionurl="http://postnukerp.com/wiki/index.php/File:PetHeadcrabs.jpg" ns="6" title="File:PetHeadcrabs.jpg" />
      <img name="Paper.jpg" timestamp="2012-12-15T06:22:34Z" user="Dragoon" url="http://postnukerp.com/wiki/images/0/0a/Paper.jpg" descriptionurl="http://postnukerp.com/wiki/index.php/File:Paper.jpg" ns="6" title="File:Paper.jpg" />
    </allimages>
  </query>
</api>