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="Brainstorm.png" />
  </query-continue>
  <query>
    <allimages>
      <img name="Banner.JPG" timestamp="2008-06-19T07:28:42Z" url="http://learningwiki.unitar.org/images/b/b1/Banner.JPG" descriptionurl="http://learningwiki.unitar.org/index.php/File:Banner.JPG" ns="6" title="File:Banner.JPG" />
      <img name="Barbara_photo.jpg" timestamp="2013-06-20T09:38:54Z" url="http://learningwiki.unitar.org/images/4/4e/Barbara_photo.jpg" descriptionurl="http://learningwiki.unitar.org/index.php/File:Barbara_photo.jpg" ns="6" title="File:Barbara photo.jpg" />
      <img name="Basic_Facilitation_Skills.pdf" timestamp="2008-09-24T12:50:46Z" url="http://learningwiki.unitar.org/images/9/9c/Basic_Facilitation_Skills.pdf" descriptionurl="http://learningwiki.unitar.org/index.php/File:Basic_Facilitation_Skills.pdf" ns="6" title="File:Basic Facilitation Skills.pdf" />
      <img name="Beamyourscreen.JPG" timestamp="2009-09-02T09:56:37Z" url="http://learningwiki.unitar.org/images/8/89/Beamyourscreen.JPG" descriptionurl="http://learningwiki.unitar.org/index.php/File:Beamyourscreen.JPG" ns="6" title="File:Beamyourscreen.JPG" />
      <img name="Behaviours.png" timestamp="2012-08-31T11:12:10Z" url="http://learningwiki.unitar.org/images/3/30/Behaviours.png" descriptionurl="http://learningwiki.unitar.org/index.php/File:Behaviours.png" ns="6" title="File:Behaviours.png" />
      <img name="Blended_Learning_Report_2013_Oxford_Group.pdf" timestamp="2013-08-26T08:21:08Z" url="http://learningwiki.unitar.org/images/c/c2/Blended_Learning_Report_2013_Oxford_Group.pdf" descriptionurl="http://learningwiki.unitar.org/index.php/File:Blended_Learning_Report_2013_Oxford_Group.pdf" ns="6" title="File:Blended Learning Report 2013 Oxford Group.pdf" />
      <img name="Bloglines.JPG" timestamp="2009-08-24T15:30:02Z" url="http://learningwiki.unitar.org/images/5/56/Bloglines.JPG" descriptionurl="http://learningwiki.unitar.org/index.php/File:Bloglines.JPG" ns="6" title="File:Bloglines.JPG" />
      <img name="Bloom&#039;s_Taxonomy_Table.jpg" timestamp="2012-01-11T13:21:26Z" url="http://learningwiki.unitar.org/images/3/32/Bloom%27s_Taxonomy_Table.jpg" descriptionurl="http://learningwiki.unitar.org/index.php/File:Bloom%27s_Taxonomy_Table.jpg" ns="6" title="File:Bloom&#039;s Taxonomy Table.jpg" />
      <img name="Bloom_Taxonomy.jpg" timestamp="2012-01-11T13:18:06Z" url="http://learningwiki.unitar.org/images/3/3e/Bloom_Taxonomy.jpg" descriptionurl="http://learningwiki.unitar.org/index.php/File:Bloom_Taxonomy.jpg" ns="6" title="File:Bloom Taxonomy.jpg" />
      <img name="Books.png" timestamp="2008-07-31T09:41:18Z" url="http://learningwiki.unitar.org/images/4/45/Books.png" descriptionurl="http://learningwiki.unitar.org/index.php/File:Books.png" ns="6" title="File:Books.png" />
    </allimages>
  </query>
</api>