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="browser_check.png" />
  </query-continue>
  <query>
    <allimages>
      <img name="BcBaser_content_Editor.png" timestamp="2017-02-17T10:55:52Z" url="https://wiki.basercms.net/images/8/82/BcBaser_content_Editor.png" descriptionurl="https://wiki.basercms.net/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:BcBaser_content_Editor.png" ns="6" title="ファイル:BcBaser content Editor.png" />
      <img name="BcBaser_content_Output.png" timestamp="2017-02-17T11:15:53Z" url="https://wiki.basercms.net/images/d/df/BcBaser_content_Output.png" descriptionurl="https://wiki.basercms.net/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:BcBaser_content_Output.png" ns="6" title="ファイル:BcBaser content Output.png" />
      <img name="about_template.gif" timestamp="2016-03-23T08:49:03Z" url="https://wiki.basercms.net/images/9/93/about_template.gif" descriptionurl="https://wiki.basercms.net/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:about_template.gif" ns="6" title="ファイル:about template.gif" />
      <img name="all_layouts.png" timestamp="2016-07-04T12:26:46Z" url="https://wiki.basercms.net/images/0/06/all_layouts.png" descriptionurl="https://wiki.basercms.net/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:all_layouts.png" ns="6" title="ファイル:all layouts.png" />
      <img name="all_layouts_about.png" timestamp="2016-07-04T12:29:09Z" url="https://wiki.basercms.net/images/9/93/all_layouts_about.png" descriptionurl="https://wiki.basercms.net/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:all_layouts_about.png" ns="6" title="ファイル:all layouts about.png" />
      <img name="bassy.png" timestamp="2014-11-01T13:32:53Z" url="https://wiki.basercms.net/images/5/52/bassy.png" descriptionurl="https://wiki.basercms.net/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:bassy.png" ns="6" title="ファイル:bassy.png" />
      <img name="bessy.png" timestamp="2016-06-06T05:05:28Z" url="https://wiki.basercms.net/images/2/21/bessy.png" descriptionurl="https://wiki.basercms.net/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:bessy.png" ns="6" title="ファイル:bessy.png" />
      <img name="blog1.png" timestamp="2016-03-24T09:23:21Z" url="https://wiki.basercms.net/images/f/f7/blog1.png" descriptionurl="https://wiki.basercms.net/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:blog1.png" ns="6" title="ファイル:blog1.png" />
      <img name="blog2.png" timestamp="2016-03-24T09:23:50Z" url="https://wiki.basercms.net/images/1/14/blog2.png" descriptionurl="https://wiki.basercms.net/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:blog2.png" ns="6" title="ファイル:blog2.png" />
      <img name="blog3.png" timestamp="2016-03-24T09:24:14Z" url="https://wiki.basercms.net/images/0/0e/blog3.png" descriptionurl="https://wiki.basercms.net/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:blog3.png" ns="6" title="ファイル:blog3.png" />
    </allimages>
  </query>
</api>