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="2009-04-14T16:53:12Z" />
  </query-continue>
  <query>
    <allimages>
      <img name="MovieS4.avi" timestamp="2009-06-25T19:52:06Z" user="Orkun" url="http://www.dayel.com/cometwikiimages/2/23/MovieS4.avi" descriptionurl="http://www.dayel.com/comet/cometwiki/index.php/File:MovieS4.avi" ns="6" title="File:MovieS4.avi" />
      <img name="Overview_simple.png" timestamp="2009-04-27T00:48:23Z" user="Markdayel" url="http://www.dayel.com/cometwikiimages/6/62/Overview_simple.png" descriptionurl="http://www.dayel.com/comet/cometwiki/index.php/File:Overview_simple.png" ns="6" title="File:Overview simple.png" />
      <img name="Overview_complex.png" timestamp="2009-04-27T00:35:06Z" user="Markdayel" url="http://www.dayel.com/cometwikiimages/2/27/Overview_complex.png" descriptionurl="http://www.dayel.com/comet/cometwiki/index.php/File:Overview_complex.png" ns="6" title="File:Overview complex.png" />
      <img name="Mymodel_forces.png" timestamp="2009-04-17T21:59:21Z" user="Markdayel" url="http://www.dayel.com/cometwikiimages/2/2d/Mymodel_forces.png" descriptionurl="http://www.dayel.com/comet/cometwiki/index.php/File:Mymodel_forces.png" ns="6" title="File:Mymodel forces.png" />
      <img name="Mymodel.png" timestamp="2009-04-17T21:59:21Z" user="Markdayel" url="http://www.dayel.com/cometwikiimages/4/43/Mymodel.png" descriptionurl="http://www.dayel.com/comet/cometwiki/index.php/File:Mymodel.png" ns="6" title="File:Mymodel.png" />
      <img name="Links_crosssection_inset.jpg" timestamp="2009-04-17T21:38:34Z" user="Markdayel" url="http://www.dayel.com/cometwikiimages/2/2d/Links_crosssection_inset.jpg" descriptionurl="http://www.dayel.com/comet/cometwiki/index.php/File:Links_crosssection_inset.jpg" ns="6" title="File:Links crosssection inset.jpg" />
      <img name="08-10-07_1148_imagearray.jpg" timestamp="2009-04-14T16:53:13Z" user="Markdayel" url="http://www.dayel.com/cometwikiimages/8/87/08-10-07_1148_imagearray.jpg" descriptionurl="http://www.dayel.com/comet/cometwiki/index.php/File:08-10-07_1148_imagearray.jpg" ns="6" title="File:08-10-07 1148 imagearray.jpg" />
      <img name="08-10-07_1146_imagearray.jpg" timestamp="2009-04-14T16:53:13Z" user="Markdayel" url="http://www.dayel.com/cometwikiimages/3/39/08-10-07_1146_imagearray.jpg" descriptionurl="http://www.dayel.com/comet/cometwiki/index.php/File:08-10-07_1146_imagearray.jpg" ns="6" title="File:08-10-07 1146 imagearray.jpg" />
      <img name="08-10-07_1145_imagearray.jpg" timestamp="2009-04-14T16:53:12Z" user="Markdayel" url="http://www.dayel.com/cometwikiimages/a/a3/08-10-07_1145_imagearray.jpg" descriptionurl="http://www.dayel.com/comet/cometwiki/index.php/File:08-10-07_1145_imagearray.jpg" ns="6" title="File:08-10-07 1145 imagearray.jpg" />
      <img name="08-10-07_1144_imagearray.jpg" timestamp="2009-04-14T16:53:12Z" user="Markdayel" url="http://www.dayel.com/cometwikiimages/7/7e/08-10-07_1144_imagearray.jpg" descriptionurl="http://www.dayel.com/comet/cometwiki/index.php/File:08-10-07_1144_imagearray.jpg" ns="6" title="File:08-10-07 1144 imagearray.jpg" />
    </allimages>
  </query>
</api>