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="2014-03-25T15:09:08Z" />
  </query-continue>
  <query>
    <allimages>
      <img name="Forms_list.png" timestamp="2014-03-25T17:22:03Z" user="Adjda" url="https://webpaproject.com/webpa_wiki/images/a/a2/Forms_list.png" descriptionurl="https://webpaproject.com/webpa_wiki/index.php/File:Forms_list.png" ns="6" title="File:Forms list.png" />
      <img name="Cross.gif" timestamp="2014-03-25T17:14:28Z" user="Adjda" url="https://webpaproject.com/webpa_wiki/images/c/c8/Cross.gif" descriptionurl="https://webpaproject.com/webpa_wiki/index.php/File:Cross.gif" ns="6" title="File:Cross.gif" />
      <img name="Arrow_green_down.gif" timestamp="2014-03-25T17:10:39Z" user="Adjda" url="https://webpaproject.com/webpa_wiki/images/b/bc/Arrow_green_down.gif" descriptionurl="https://webpaproject.com/webpa_wiki/index.php/File:Arrow_green_down.gif" ns="6" title="File:Arrow green down.gif" />
      <img name="Arrow_green_up.gif" timestamp="2014-03-25T17:10:25Z" user="Adjda" url="https://webpaproject.com/webpa_wiki/images/6/64/Arrow_green_up.gif" descriptionurl="https://webpaproject.com/webpa_wiki/index.php/File:Arrow_green_up.gif" ns="6" title="File:Arrow green up.gif" />
      <img name="Forms_toolbar.png" timestamp="2014-03-25T17:08:29Z" user="Adjda" url="https://webpaproject.com/webpa_wiki/images/c/c9/Forms_toolbar.png" descriptionurl="https://webpaproject.com/webpa_wiki/index.php/File:Forms_toolbar.png" ns="6" title="File:Forms toolbar.png" />
      <img name="Forms_ex_criterion_assess.png" timestamp="2014-03-25T17:08:09Z" user="Adjda" url="https://webpaproject.com/webpa_wiki/images/d/de/Forms_ex_criterion_assess.png" descriptionurl="https://webpaproject.com/webpa_wiki/index.php/File:Forms_ex_criterion_assess.png" ns="6" title="File:Forms ex criterion assess.png" />
      <img name="Assess_tabs.png" timestamp="2014-03-25T15:38:24Z" user="Adjda" url="https://webpaproject.com/webpa_wiki/images/5/5c/Assess_tabs.png" descriptionurl="https://webpaproject.com/webpa_wiki/index.php/File:Assess_tabs.png" ns="6" title="File:Assess tabs.png" />
      <img name="Mark_sheet.gif" timestamp="2014-03-25T15:10:48Z" user="Adjda" url="https://webpaproject.com/webpa_wiki/images/f/f0/Mark_sheet.gif" descriptionurl="https://webpaproject.com/webpa_wiki/index.php/File:Mark_sheet.gif" ns="6" title="File:Mark sheet.gif" />
      <img name="Group_marks.gif" timestamp="2014-03-25T15:10:31Z" user="Adjda" url="https://webpaproject.com/webpa_wiki/images/d/d1/Group_marks.gif" descriptionurl="https://webpaproject.com/webpa_wiki/index.php/File:Group_marks.gif" ns="6" title="File:Group marks.gif" />
      <img name="Students_responded.gif" timestamp="2014-03-25T15:10:02Z" user="Adjda" url="https://webpaproject.com/webpa_wiki/images/d/d8/Students_responded.gif" descriptionurl="https://webpaproject.com/webpa_wiki/index.php/File:Students_responded.gif" ns="6" title="File:Students responded.gif" />
    </allimages>
  </query>
</api>