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="20100218224630|Structure_bases.gif" />
  </query-continue>
  <query>
    <allimages>
      <img name="Dreamwidth_logo_moocard.png" timestamp="2012-06-20T21:56:09Z" user="Foxfirefey" url="http://wiki.dreamwidth.net/wiki/images/4/40/Dreamwidth_logo_moocard.png" descriptionurl="http://wiki.dreamwidth.net/wiki/index.php/File:Dreamwidth_logo_moocard.png" ns="6" title="File:Dreamwidth logo moocard.png" />
      <img name="DW-CLAv2.pdf" timestamp="2011-12-25T19:34:06Z" user="Branchandroot" url="http://wiki.dreamwidth.net/wiki/images/2/2b/DW-CLAv2.pdf" descriptionurl="http://wiki.dreamwidth.net/wiki/index.php/File:DW-CLAv2.pdf" ns="6" title="File:DW-CLAv2.pdf" />
      <img name="Skullbutt.jpg" timestamp="2011-10-11T04:08:27Z" user="AzureLunaticDW" url="http://wiki.dreamwidth.net/wiki/images/e/e7/Skullbutt.jpg" descriptionurl="http://wiki.dreamwidth.net/wiki/index.php/File:Skullbutt.jpg" ns="6" title="File:Skullbutt.jpg" />
      <img name="Supportteammobilize.png" timestamp="2011-08-13T06:43:49Z" user="AzureLunaticDW" url="http://wiki.dreamwidth.net/wiki/images/4/4d/Supportteammobilize.png" descriptionurl="http://wiki.dreamwidth.net/wiki/index.php/File:Supportteammobilize.png" ns="6" title="File:Supportteammobilize.png" />
      <img name="Spamhammer.jpg" timestamp="2011-08-13T06:31:20Z" user="AzureLunaticDW" url="http://wiki.dreamwidth.net/wiki/images/d/d0/Spamhammer.jpg" descriptionurl="http://wiki.dreamwidth.net/wiki/index.php/File:Spamhammer.jpg" ns="6" title="File:Spamhammer.jpg" />
      <img name="Support_table.png" timestamp="2010-12-11T19:04:05Z" user="Xtina" url="http://wiki.dreamwidth.net/wiki/images/6/60/Support_table.png" descriptionurl="http://wiki.dreamwidth.net/wiki/index.php/File:Support_table.png" ns="6" title="File:Support table.png" />
      <img name="Support_filter_opts.png" timestamp="2010-12-01T20:04:20Z" user="Xtina" url="http://wiki.dreamwidth.net/wiki/images/5/57/Support_filter_opts.png" descriptionurl="http://wiki.dreamwidth.net/wiki/index.php/File:Support_filter_opts.png" ns="6" title="File:Support filter opts.png" />
      <img name="Dreamwidthfriends.jpg" timestamp="2010-10-25T18:26:16Z" user="Rydra-wong" url="http://wiki.dreamwidth.net/wiki/images/4/4a/Dreamwidthfriends.jpg" descriptionurl="http://wiki.dreamwidth.net/wiki/index.php/File:Dreamwidthfriends.jpg" ns="6" title="File:Dreamwidthfriends.jpg" />
      <img name="XKCD_-_island.PNG" timestamp="2010-10-07T06:14:04Z" user="AzureLunaticDW" url="http://wiki.dreamwidth.net/wiki/images/f/fe/XKCD_-_island.PNG" descriptionurl="http://wiki.dreamwidth.net/wiki/index.php/File:XKCD_-_island.PNG" ns="6" title="File:XKCD - island.PNG" />
      <img name="140-chars.png" timestamp="2010-09-20T20:29:11Z" user="AzureLunaticDW" url="http://wiki.dreamwidth.net/wiki/images/6/6c/140-chars.png" descriptionurl="http://wiki.dreamwidth.net/wiki/index.php/File:140-chars.png" ns="6" title="File:140-chars.png" />
    </allimages>
  </query>
</api>