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="Bot_detection.jpg" />
  </query-continue>
  <query>
    <allimages>
      <img name="Banner_en_backend_banner.jpg" timestamp="2010-10-02T22:33:35Z" url="https://en.contaowiki.org/images/en/2/21/Banner_en_backend_banner.jpg" descriptionurl="https://en.contaowiki.org/File:Banner_en_backend_banner.jpg" ns="6" title="File:Banner en backend banner.jpg" />
      <img name="Banner_en_backend_banner_new.jpg" timestamp="2010-10-02T23:09:04Z" url="https://en.contaowiki.org/images/en/f/f7/Banner_en_backend_banner_new.jpg" descriptionurl="https://en.contaowiki.org/File:Banner_en_backend_banner_new.jpg" ns="6" title="File:Banner en backend banner new.jpg" />
      <img name="Banner_en_backend_bannerstatistic.jpg" timestamp="2010-10-02T22:38:29Z" url="https://en.contaowiki.org/images/en/a/a8/Banner_en_backend_bannerstatistic.jpg" descriptionurl="https://en.contaowiki.org/File:Banner_en_backend_bannerstatistic.jpg" ns="6" title="File:Banner en backend bannerstatistic.jpg" />
      <img name="Banner_en_backend_category_new.jpg" timestamp="2010-10-02T23:04:54Z" url="https://en.contaowiki.org/images/en/e/e7/Banner_en_backend_category_new.jpg" descriptionurl="https://en.contaowiki.org/File:Banner_en_backend_category_new.jpg" ns="6" title="File:Banner en backend category new.jpg" />
      <img name="Banner_en_frontend_all_banner.jpg" timestamp="2010-10-02T22:55:39Z" url="https://en.contaowiki.org/images/en/9/99/Banner_en_frontend_all_banner.jpg" descriptionurl="https://en.contaowiki.org/File:Banner_en_frontend_all_banner.jpg" ns="6" title="File:Banner en frontend all banner.jpg" />
      <img name="Banner_en_frontend_one_banner.jpg" timestamp="2010-10-02T22:50:21Z" url="https://en.contaowiki.org/images/en/8/8b/Banner_en_frontend_one_banner.jpg" descriptionurl="https://en.contaowiki.org/File:Banner_en_frontend_one_banner.jpg" ns="6" title="File:Banner en frontend one banner.jpg" />
      <img name="Be_user_online_en_member.jpg" timestamp="2012-11-10T17:51:03Z" url="https://en.contaowiki.org/images/en/4/43/Be_user_online_en_member.jpg" descriptionurl="https://en.contaowiki.org/File:Be_user_online_en_member.jpg" ns="6" title="File:Be user online en member.jpg" />
      <img name="Be_user_online_en_user.jpg" timestamp="2012-11-10T17:51:31Z" url="https://en.contaowiki.org/images/en/7/70/Be_user_online_en_user.jpg" descriptionurl="https://en.contaowiki.org/File:Be_user_online_en_user.jpg" ns="6" title="File:Be user online en user.jpg" />
      <img name="Beginner.png" timestamp="2010-06-01T01:08:08Z" url="https://en.contaowiki.org/images/en/0/09/Beginner.png" descriptionurl="https://en.contaowiki.org/File:Beginner.png" ns="6" title="File:Beginner.png" />
      <img name="Bom_checker_er.jpg" timestamp="2011-05-07T23:03:55Z" url="https://en.contaowiki.org/images/en/6/6b/Bom_checker_er.jpg" descriptionurl="https://en.contaowiki.org/File:Bom_checker_er.jpg" ns="6" title="File:Bom checker er.jpg" />
    </allimages>
  </query>
</api>