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="Poller-bad.pdf" />
  </query-continue>
  <query>
    <allimages>
      <img name="CLOCKSS-OrgChart.png" timestamp="2013-09-26T23:06:31Z" url="http://documents.clockss.org/images/e/e2/CLOCKSS-OrgChart.png" descriptionurl="http://documents.clockss.org/index.php/File:CLOCKSS-OrgChart.png" ns="6" title="File:CLOCKSS-OrgChart.png" />
      <img name="CLOCKSS_inventory.png" timestamp="2013-09-30T18:42:12Z" url="http://documents.clockss.org/images/2/22/CLOCKSS_inventory.png" descriptionurl="http://documents.clockss.org/index.php/File:CLOCKSS_inventory.png" ns="6" title="File:CLOCKSS inventory.png" />
      <img name="ClockssTaylorAndFrancisPlugin.xml.pdf" timestamp="2014-04-06T21:47:04Z" url="http://documents.clockss.org/images/a/a0/ClockssTaylorAndFrancisPlugin.xml.pdf" descriptionurl="http://documents.clockss.org/index.php/File:ClockssTaylorAndFrancisPlugin.xml.pdf" ns="6" title="File:ClockssTaylorAndFrancisPlugin.xml.pdf" />
      <img name="Hist_pr_auid_count27.png" timestamp="2014-04-10T03:29:46Z" url="http://documents.clockss.org/images/5/50/Hist_pr_auid_count27.png" descriptionurl="http://documents.clockss.org/index.php/File:Hist_pr_auid_count27.png" ns="6" title="File:Hist pr auid count27.png" />
      <img name="LA24-FITS.pdf" timestamp="2013-12-19T22:48:30Z" url="http://documents.clockss.org/images/b/be/LA24-FITS.pdf" descriptionurl="http://documents.clockss.org/index.php/File:LA24-FITS.pdf" ns="6" title="File:LA24-FITS.pdf" />
      <img name="LA24_FITS.pdf" timestamp="2013-12-09T17:23:50Z" url="http://documents.clockss.org/images/d/d7/LA24_FITS.pdf" descriptionurl="http://documents.clockss.org/index.php/File:LA24_FITS.pdf" ns="6" title="File:LA24 FITS.pdf" />
      <img name="LA24_metadata.pdf" timestamp="2013-12-09T15:14:45Z" url="http://documents.clockss.org/images/f/fd/LA24_metadata.pdf" descriptionurl="http://documents.clockss.org/index.php/File:LA24_metadata.pdf" ns="6" title="File:LA24 metadata.pdf" />
      <img name="LA24_urls.pdf" timestamp="2013-12-09T15:06:07Z" url="http://documents.clockss.org/images/0/0d/LA24_urls.pdf" descriptionurl="http://documents.clockss.org/index.php/File:LA24_urls.pdf" ns="6" title="File:LA24 urls.pdf" />
      <img name="LOCKSSOrgChart.png" timestamp="2019-08-15T00:52:39Z" url="http://documents.clockss.org/images/5/56/LOCKSSOrgChart.png" descriptionurl="http://documents.clockss.org/index.php/File:LOCKSSOrgChart.png" ns="6" title="File:LOCKSSOrgChart.png" />
      <img name="MetaDatabase-Schema.png" timestamp="2013-09-27T01:33:45Z" url="http://documents.clockss.org/images/7/7f/MetaDatabase-Schema.png" descriptionurl="http://documents.clockss.org/index.php/File:MetaDatabase-Schema.png" ns="6" title="File:MetaDatabase-Schema.png" />
    </allimages>
  </query>
</api>