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 aicontinue="IMG_0004a1.jpg" />
  </query-continue>
  <query>
    <allimages>
      <img name="Blue_hills.jpg" timestamp="2007-09-10T11:34:02Z" url="http://www.saarenkartano.muuritutkimus.fi/images/f/f7/Blue_hills.jpg" descriptionurl="http://www.saarenkartano.muuritutkimus.fi/index.php/File:Blue_hills.jpg" ns="6" title="File:Blue hills.jpg" />
      <img name="IMG_0002.jpg" timestamp="2007-10-08T09:54:30Z" url="http://www.saarenkartano.muuritutkimus.fi/images/1/15/IMG_0002.jpg" descriptionurl="http://www.saarenkartano.muuritutkimus.fi/index.php/File:IMG_0002.jpg" ns="6" title="File:IMG 0002.jpg" />
      <img name="IMG_0003.jpg" timestamp="2007-10-01T11:31:46Z" url="http://www.saarenkartano.muuritutkimus.fi/images/5/51/IMG_0003.jpg" descriptionurl="http://www.saarenkartano.muuritutkimus.fi/index.php/File:IMG_0003.jpg" ns="6" title="File:IMG 0003.jpg" />
      <img name="IMG_0003a.jpg" timestamp="2007-10-02T09:00:39Z" url="http://www.saarenkartano.muuritutkimus.fi/images/5/50/IMG_0003a.jpg" descriptionurl="http://www.saarenkartano.muuritutkimus.fi/index.php/File:IMG_0003a.jpg" ns="6" title="File:IMG 0003a.jpg" />
      <img name="IMG_0003a1.jpg" timestamp="2007-10-08T09:58:22Z" url="http://www.saarenkartano.muuritutkimus.fi/images/e/e8/IMG_0003a1.jpg" descriptionurl="http://www.saarenkartano.muuritutkimus.fi/index.php/File:IMG_0003a1.jpg" ns="6" title="File:IMG 0003a1.jpg" />
      <img name="IMG_0003a2.jpg" timestamp="2007-10-08T09:59:38Z" url="http://www.saarenkartano.muuritutkimus.fi/images/6/60/IMG_0003a2.jpg" descriptionurl="http://www.saarenkartano.muuritutkimus.fi/index.php/File:IMG_0003a2.jpg" ns="6" title="File:IMG 0003a2.jpg" />
      <img name="IMG_0003a3.jpg" timestamp="2007-10-03T04:43:58Z" url="http://www.saarenkartano.muuritutkimus.fi/images/9/9d/IMG_0003a3.jpg" descriptionurl="http://www.saarenkartano.muuritutkimus.fi/index.php/File:IMG_0003a3.jpg" ns="6" title="File:IMG 0003a3.jpg" />
      <img name="IMG_0003a4.jpg" timestamp="2007-10-03T08:10:20Z" url="http://www.saarenkartano.muuritutkimus.fi/images/f/f9/IMG_0003a4.jpg" descriptionurl="http://www.saarenkartano.muuritutkimus.fi/index.php/File:IMG_0003a4.jpg" ns="6" title="File:IMG 0003a4.jpg" />
      <img name="IMG_0003aa.jpg" timestamp="2007-10-02T09:05:43Z" url="http://www.saarenkartano.muuritutkimus.fi/images/8/86/IMG_0003aa.jpg" descriptionurl="http://www.saarenkartano.muuritutkimus.fi/index.php/File:IMG_0003aa.jpg" ns="6" title="File:IMG 0003aa.jpg" />
      <img name="IMG_0004.jpg" timestamp="2007-10-01T11:40:10Z" url="http://www.saarenkartano.muuritutkimus.fi/images/d/d2/IMG_0004.jpg" descriptionurl="http://www.saarenkartano.muuritutkimus.fi/index.php/File:IMG_0004.jpg" ns="6" title="File:IMG 0004.jpg" />
    </allimages>
  </query>
</api>