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="Bitrix24_18.jpg" />
  </query-continue>
  <query>
    <allimages>
      <img name="Backup_сценариев.png" timestamp="2013-12-03T11:39:45Z" url="https://wiki.oktell.ru/images/4/43/Backup_%D1%81%D1%86%D0%B5%D0%BD%D0%B0%D1%80%D0%B8%D0%B5%D0%B2.png" descriptionurl="%D0%A4%D0%B0%D0%B9%D0%BB:Backup_%D1%81%D1%86%D0%B5%D0%BD%D0%B0%D1%80%D0%B8%D0%B5%D0%B2.png" ns="6" title="Файл:Backup сценариев.png" />
      <img name="Bitrix24_1.jpg" timestamp="2015-06-16T07:27:19Z" url="https://wiki.oktell.ru/images/f/fc/Bitrix24_1.jpg" descriptionurl="%D0%A4%D0%B0%D0%B9%D0%BB:Bitrix24_1.jpg" ns="6" title="Файл:Bitrix24 1.jpg" />
      <img name="Bitrix24_10.jpg" timestamp="2015-06-16T07:27:24Z" url="https://wiki.oktell.ru/images/d/d4/Bitrix24_10.jpg" descriptionurl="%D0%A4%D0%B0%D0%B9%D0%BB:Bitrix24_10.jpg" ns="6" title="Файл:Bitrix24 10.jpg" />
      <img name="Bitrix24_11.jpg" timestamp="2015-06-16T07:27:24Z" url="https://wiki.oktell.ru/images/a/aa/Bitrix24_11.jpg" descriptionurl="%D0%A4%D0%B0%D0%B9%D0%BB:Bitrix24_11.jpg" ns="6" title="Файл:Bitrix24 11.jpg" />
      <img name="Bitrix24_12.jpg" timestamp="2015-06-16T07:27:25Z" url="https://wiki.oktell.ru/images/5/59/Bitrix24_12.jpg" descriptionurl="%D0%A4%D0%B0%D0%B9%D0%BB:Bitrix24_12.jpg" ns="6" title="Файл:Bitrix24 12.jpg" />
      <img name="Bitrix24_13.jpg" timestamp="2015-06-16T07:27:25Z" url="https://wiki.oktell.ru/images/9/95/Bitrix24_13.jpg" descriptionurl="%D0%A4%D0%B0%D0%B9%D0%BB:Bitrix24_13.jpg" ns="6" title="Файл:Bitrix24 13.jpg" />
      <img name="Bitrix24_14.jpg" timestamp="2015-06-16T07:27:26Z" url="https://wiki.oktell.ru/images/e/ec/Bitrix24_14.jpg" descriptionurl="%D0%A4%D0%B0%D0%B9%D0%BB:Bitrix24_14.jpg" ns="6" title="Файл:Bitrix24 14.jpg" />
      <img name="Bitrix24_15.jpg" timestamp="2015-06-16T07:27:26Z" url="https://wiki.oktell.ru/images/1/1a/Bitrix24_15.jpg" descriptionurl="%D0%A4%D0%B0%D0%B9%D0%BB:Bitrix24_15.jpg" ns="6" title="Файл:Bitrix24 15.jpg" />
      <img name="Bitrix24_16.jpg" timestamp="2015-06-16T07:27:27Z" url="https://wiki.oktell.ru/images/1/19/Bitrix24_16.jpg" descriptionurl="%D0%A4%D0%B0%D0%B9%D0%BB:Bitrix24_16.jpg" ns="6" title="Файл:Bitrix24 16.jpg" />
      <img name="Bitrix24_17.jpg" timestamp="2015-06-16T07:27:28Z" url="https://wiki.oktell.ru/images/b/bf/Bitrix24_17.jpg" descriptionurl="%D0%A4%D0%B0%D0%B9%D0%BB:Bitrix24_17.jpg" ns="6" title="Файл:Bitrix24 17.jpg" />
    </allimages>
  </query>
</api>