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="20130608163550|Twinsenportrait.png" />
  </query-continue>
  <query>
    <allimages>
      <img name="J_McKalling.png" timestamp="2017-05-31T22:21:48Z" user="J McKalling" url="https://twinsuniverse.xesf.net/images/7/7c/J_McKalling.png" descriptionurl="https://twinsuniverse.xesf.net/File:J_McKalling.png" ns="6" title="File:J McKalling.png" />
      <img name="Orb_yellow30.png" timestamp="2014-05-23T12:21:24Z" user="J McKalling" url="https://twinsuniverse.xesf.net/images/e/e4/Orb_yellow30.png" descriptionurl="https://twinsuniverse.xesf.net/File:Orb_yellow30.png" ns="6" title="File:Orb yellow30.png" />
      <img name="Orb_red30.png" timestamp="2014-05-23T12:21:12Z" user="J McKalling" url="https://twinsuniverse.xesf.net/images/f/f8/Orb_red30.png" descriptionurl="https://twinsuniverse.xesf.net/File:Orb_red30.png" ns="6" title="File:Orb red30.png" />
      <img name="Orb_purple30.png" timestamp="2014-05-23T12:20:58Z" user="J McKalling" url="https://twinsuniverse.xesf.net/images/6/61/Orb_purple30.png" descriptionurl="https://twinsuniverse.xesf.net/File:Orb_purple30.png" ns="6" title="File:Orb purple30.png" />
      <img name="Orb_pink30.png" timestamp="2014-05-23T12:20:46Z" user="J McKalling" url="https://twinsuniverse.xesf.net/images/f/f8/Orb_pink30.png" descriptionurl="https://twinsuniverse.xesf.net/File:Orb_pink30.png" ns="6" title="File:Orb pink30.png" />
      <img name="Orb_navy30.png" timestamp="2014-05-23T12:20:34Z" user="J McKalling" url="https://twinsuniverse.xesf.net/images/7/7b/Orb_navy30.png" descriptionurl="https://twinsuniverse.xesf.net/File:Orb_navy30.png" ns="6" title="File:Orb navy30.png" />
      <img name="Orb_grey30.png" timestamp="2014-05-23T12:20:22Z" user="J McKalling" url="https://twinsuniverse.xesf.net/images/6/6e/Orb_grey30.png" descriptionurl="https://twinsuniverse.xesf.net/File:Orb_grey30.png" ns="6" title="File:Orb grey30.png" />
      <img name="Orb_grass30.png" timestamp="2014-05-23T12:20:09Z" user="J McKalling" url="https://twinsuniverse.xesf.net/images/e/e2/Orb_grass30.png" descriptionurl="https://twinsuniverse.xesf.net/File:Orb_grass30.png" ns="6" title="File:Orb grass30.png" />
      <img name="Orb_green30.png" timestamp="2014-05-23T12:19:41Z" user="J McKalling" url="https://twinsuniverse.xesf.net/images/d/da/Orb_green30.png" descriptionurl="https://twinsuniverse.xesf.net/File:Orb_green30.png" ns="6" title="File:Orb green30.png" />
      <img name="Orb_cyan30.png" timestamp="2014-05-23T12:18:43Z" user="J McKalling" url="https://twinsuniverse.xesf.net/images/6/6f/Orb_cyan30.png" descriptionurl="https://twinsuniverse.xesf.net/File:Orb_cyan30.png" ns="6" title="File:Orb cyan30.png" />
    </allimages>
  </query>
</api>