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="Bars_base_250b.jpg" />
  </query-continue>
  <query>
    <allimages>
      <img name="B.JPG" timestamp="2014-11-21T21:47:36Z" url="https://ccrma.stanford.edu/wiki/images/9/94/B.JPG" descriptionurl="https://ccrma.stanford.edu/wiki/File:B.JPG" ns="6" title="File:B.JPG" />
      <img name="BB_nano.jpg" timestamp="2009-06-23T05:22:27Z" url="https://ccrma.stanford.edu/wiki/images/7/75/BB_nano.jpg" descriptionurl="https://ccrma.stanford.edu/wiki/File:BB_nano.jpg" ns="6" title="File:BB nano.jpg" />
      <img name="BCF2000_top.jpg" timestamp="2009-12-04T20:21:35Z" url="https://ccrma.stanford.edu/wiki/images/5/53/BCF2000_top.jpg" descriptionurl="https://ccrma.stanford.edu/wiki/File:BCF2000_top.jpg" ns="6" title="File:BCF2000 top.jpg" />
      <img name="BGP_1ST_ITERATION.jpg" timestamp="2014-11-03T07:18:06Z" url="https://ccrma.stanford.edu/wiki/images/4/41/BGP_1ST_ITERATION.jpg" descriptionurl="https://ccrma.stanford.edu/wiki/File:BGP_1ST_ITERATION.jpg" ns="6" title="File:BGP 1ST ITERATION.jpg" />
      <img name="BGP_2ND_ITERATION.jpg" timestamp="2014-11-03T07:15:30Z" url="https://ccrma.stanford.edu/wiki/images/0/09/BGP_2ND_ITERATION.jpg" descriptionurl="https://ccrma.stanford.edu/wiki/File:BGP_2ND_ITERATION.jpg" ns="6" title="File:BGP 2ND ITERATION.jpg" />
      <img name="BP_1ST_ITERATION.jpg" timestamp="2014-11-03T07:09:21Z" url="https://ccrma.stanford.edu/wiki/images/5/59/BP_1ST_ITERATION.jpg" descriptionurl="https://ccrma.stanford.edu/wiki/File:BP_1ST_ITERATION.jpg" ns="6" title="File:BP 1ST ITERATION.jpg" />
      <img name="Back.jpg" timestamp="2019-06-12T00:17:51Z" url="https://ccrma.stanford.edu/wiki/images/7/76/Back.jpg" descriptionurl="https://ccrma.stanford.edu/wiki/File:Back.jpg" ns="6" title="File:Back.jpg" />
      <img name="Badidea.gif" timestamp="2009-09-23T20:39:06Z" url="https://ccrma.stanford.edu/wiki/images/d/d2/Badidea.gif" descriptionurl="https://ccrma.stanford.edu/wiki/File:Badidea.gif" ns="6" title="File:Badidea.gif" />
      <img name="Bamboo.jpg" timestamp="2008-01-21T10:09:10Z" url="https://ccrma.stanford.edu/wiki/images/9/9e/Bamboo.jpg" descriptionurl="https://ccrma.stanford.edu/wiki/File:Bamboo.jpg" ns="6" title="File:Bamboo.jpg" />
      <img name="Bare_conductive.jpg" timestamp="2018-04-14T16:39:31Z" url="https://ccrma.stanford.edu/wiki/images/5/5e/Bare_conductive.jpg" descriptionurl="https://ccrma.stanford.edu/wiki/File:Bare_conductive.jpg" ns="6" title="File:Bare conductive.jpg" />
    </allimages>
  </query>
</api>