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="Benson_Grace_007.mp3" />
  </query-continue>
  <query>
    <allimages>
      <img name="BHughesCert4.pdf" timestamp="2014-12-10T18:51:19Z" url="http://www.nursinghistory.org.nz/images/1/15/BHughesCert4.pdf" descriptionurl="http://www.nursinghistory.org.nz/index.php/File:BHughesCert4.pdf" ns="6" title="File:BHughesCert4.pdf" />
      <img name="BR-3-006_Prelim_group_May_1967.jpg" timestamp="2015-01-29T03:41:36Z" url="http://www.nursinghistory.org.nz/images/3/3e/BR-3-006_Prelim_group_May_1967.jpg" descriptionurl="http://www.nursinghistory.org.nz/index.php/File:BR-3-006_Prelim_group_May_1967.jpg" ns="6" title="File:BR-3-006 Prelim group May 1967.jpg" />
      <img name="BR-3-007_After-Finals_Ball.jpg" timestamp="2015-01-29T03:42:47Z" url="http://www.nursinghistory.org.nz/images/1/18/BR-3-007_After-Finals_Ball.jpg" descriptionurl="http://www.nursinghistory.org.nz/index.php/File:BR-3-007_After-Finals_Ball.jpg" ns="6" title="File:BR-3-007 After-Finals Ball.jpg" />
      <img name="Bed_making.jpg" timestamp="2015-03-24T00:29:11Z" url="http://www.nursinghistory.org.nz/images/1/18/Bed_making.jpg" descriptionurl="http://www.nursinghistory.org.nz/index.php/File:Bed_making.jpg" ns="6" title="File:Bed making.jpg" />
      <img name="Benson_Grace_001.mp3" timestamp="2014-07-24T04:36:40Z" url="http://www.nursinghistory.org.nz/images/0/0d/Benson_Grace_001.mp3" descriptionurl="http://www.nursinghistory.org.nz/index.php/File:Benson_Grace_001.mp3" ns="6" title="File:Benson Grace 001.mp3" />
      <img name="Benson_Grace_002.mp3" timestamp="2014-07-24T06:16:17Z" url="http://www.nursinghistory.org.nz/images/1/15/Benson_Grace_002.mp3" descriptionurl="http://www.nursinghistory.org.nz/index.php/File:Benson_Grace_002.mp3" ns="6" title="File:Benson Grace 002.mp3" />
      <img name="Benson_Grace_003.mp3" timestamp="2014-07-27T03:24:12Z" url="http://www.nursinghistory.org.nz/images/e/e4/Benson_Grace_003.mp3" descriptionurl="http://www.nursinghistory.org.nz/index.php/File:Benson_Grace_003.mp3" ns="6" title="File:Benson Grace 003.mp3" />
      <img name="Benson_Grace_004.mp3" timestamp="2014-07-27T04:08:28Z" url="http://www.nursinghistory.org.nz/images/5/52/Benson_Grace_004.mp3" descriptionurl="http://www.nursinghistory.org.nz/index.php/File:Benson_Grace_004.mp3" ns="6" title="File:Benson Grace 004.mp3" />
      <img name="Benson_Grace_005.mp3" timestamp="2014-07-27T04:08:10Z" url="http://www.nursinghistory.org.nz/images/7/78/Benson_Grace_005.mp3" descriptionurl="http://www.nursinghistory.org.nz/index.php/File:Benson_Grace_005.mp3" ns="6" title="File:Benson Grace 005.mp3" />
      <img name="Benson_Grace_006_all.mp3" timestamp="2014-11-19T19:12:57Z" url="http://www.nursinghistory.org.nz/images/2/25/Benson_Grace_006_all.mp3" descriptionurl="http://www.nursinghistory.org.nz/index.php/File:Benson_Grace_006_all.mp3" ns="6" title="File:Benson Grace 006 all.mp3" />
    </allimages>
  </query>
</api>