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>
    <allimages>
      <img name="14.5x114_dummy.jpg" timestamp="2017-05-30T13:26:32Z" user="Admin" url="http://www.gunsopedia.com/images/0/06/14.5x114_dummy.jpg" descriptionurl="http://www.gunsopedia.com/File:14.5x114_dummy.jpg" ns="6" title="File:14.5x114 dummy.jpg" />
      <img name="14.5x114_projectiles.JPG" timestamp="2017-05-30T13:19:15Z" user="Admin" url="http://www.gunsopedia.com/images/6/6e/14.5x114_projectiles.JPG" descriptionurl="http://www.gunsopedia.com/File:14.5x114_projectiles.JPG" ns="6" title="File:14.5x114 projectiles.JPG" />
      <img name="14.5x114_dimensions.jpg" timestamp="2017-05-30T12:59:35Z" user="Admin" url="http://www.gunsopedia.com/images/f/f6/14.5x114_dimensions.jpg" descriptionurl="http://www.gunsopedia.com/File:14.5x114_dimensions.jpg" ns="6" title="File:14.5x114 dimensions.jpg" />
      <img name="14.5x114_cartridge.jpg" timestamp="2017-05-30T12:43:30Z" user="Admin" url="http://www.gunsopedia.com/images/4/47/14.5x114_cartridge.jpg" descriptionurl="http://www.gunsopedia.com/File:14.5x114_cartridge.jpg" ns="6" title="File:14.5x114 cartridge.jpg" />
      <img name="Screenshot_from_2017-05-29_12-35-49.png" timestamp="2017-05-29T16:45:21Z" user="Admin" url="http://www.gunsopedia.com/images/7/7e/Screenshot_from_2017-05-29_12-35-49.png" descriptionurl="http://www.gunsopedia.com/File:Screenshot_from_2017-05-29_12-35-49.png" ns="6" title="File:Screenshot from 2017-05-29 12-35-49.png" />
      <img name="Can-US_scaled_homicide.jpg" timestamp="2016-09-25T13:05:55Z" user="Admin" url="http://www.gunsopedia.com/images/5/5b/Can-US_scaled_homicide.jpg" descriptionurl="http://www.gunsopedia.com/File:Can-US_scaled_homicide.jpg" ns="6" title="File:Can-US scaled homicide.jpg" />
      <img name="UK_handgun_crime.jpg" timestamp="2015-08-22T14:59:19Z" user="Admin" url="http://www.gunsopedia.com/images/6/6f/UK_handgun_crime.jpg" descriptionurl="http://www.gunsopedia.com/File:UK_handgun_crime.jpg" ns="6" title="File:UK handgun crime.jpg" />
      <img name="1MMAGC_logo.png" timestamp="2015-08-22T14:57:05Z" user="Admin" url="http://www.gunsopedia.com/images/c/ca/1MMAGC_logo.png" descriptionurl="http://www.gunsopedia.com/File:1MMAGC_logo.png" ns="6" title="File:1MMAGC logo.png" />
      <img name="Gun_gate.jpg" timestamp="2015-08-22T14:48:45Z" user="Admin" url="http://www.gunsopedia.com/images/4/48/Gun_gate.jpg" descriptionurl="http://www.gunsopedia.com/File:Gun_gate.jpg" ns="6" title="File:Gun gate.jpg" />
      <img name="WMD_Beast.jpg" timestamp="2015-07-30T20:47:43Z" user="Dennis" url="http://www.gunsopedia.com/images/1/19/WMD_Beast.jpg" descriptionurl="http://www.gunsopedia.com/File:WMD_Beast.jpg" ns="6" title="File:WMD Beast.jpg" />
    </allimages>
  </query>
  <query-continue>
    <allimages aistart="2015-07-30T14:41:16Z" />
  </query-continue>
</api>