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="Матеріали_АПСК-2019.pdf" timestamp="2019-06-10T21:26:13Z" user="Admin" url=" /images/%D0%9C%D0%B0%D1%82%D0%B5%D1%80%D1%96%D0%B0%D0%BB%D0%B8_%D0%90%D0%9F%D0%A1%D0%9A-2019.pdf" descriptionurl=" /index.php?title=%D0%A4%D0%B0%D0%B9%D0%BB:%D0%9C%D0%B0%D1%82%D0%B5%D1%80%D1%96%D0%B0%D0%BB%D0%B8_%D0%90%D0%9F%D0%A1%D0%9A-2019.pdf" ns="6" title="Файл:Матеріали АПСК-2019.pdf" />
      <img name="Програма_АПСК-2019.pdf" timestamp="2019-06-10T21:17:27Z" user="Admin" url=" /images/%D0%9F%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%B0_%D0%90%D0%9F%D0%A1%D0%9A-2019.pdf" descriptionurl=" /index.php?title=%D0%A4%D0%B0%D0%B9%D0%BB:%D0%9F%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%B0_%D0%90%D0%9F%D0%A1%D0%9A-2019.pdf" ns="6" title="Файл:Програма АПСК-2019.pdf" />
      <img name="16387950_443935419275053_4241017951672567443_n1.jpg" timestamp="2019-03-27T14:16:57Z" user="Admin" url=" /images/16387950_443935419275053_4241017951672567443_n1.jpg" descriptionurl=" /index.php?title=%D0%A4%D0%B0%D0%B9%D0%BB:16387950_443935419275053_4241017951672567443_n1.jpg" ns="6" title="Файл:16387950 443935419275053 4241017951672567443 n1.jpg" />
      <img name="54385214_351075868838947_780435797231796224_n.jpg" timestamp="2019-03-27T13:55:09Z" user="Admin" url=" /images/54385214_351075868838947_780435797231796224_n.jpg" descriptionurl=" /index.php?title=%D0%A4%D0%B0%D0%B9%D0%BB:54385214_351075868838947_780435797231796224_n.jpg" ns="6" title="Файл:54385214 351075868838947 780435797231796224 n.jpg" />
      <img name="20190325_Анищенко.jpg" timestamp="2019-03-27T13:39:36Z" user="Admin" url=" /images/20190325_%D0%90%D0%BD%D0%B8%D1%89%D0%B5%D0%BD%D0%BA%D0%BE.jpg" descriptionurl=" /index.php?title=%D0%A4%D0%B0%D0%B9%D0%BB:20190325_%D0%90%D0%BD%D0%B8%D1%89%D0%B5%D0%BD%D0%BA%D0%BE.jpg" ns="6" title="Файл:20190325 Анищенко.jpg" />
      <img name="20190325_Анищенко_1.jpg" timestamp="2019-03-27T13:37:19Z" user="Admin" url=" /images/20190325_%D0%90%D0%BD%D0%B8%D1%89%D0%B5%D0%BD%D0%BA%D0%BE_1.jpg" descriptionurl=" /index.php?title=%D0%A4%D0%B0%D0%B9%D0%BB:20190325_%D0%90%D0%BD%D0%B8%D1%89%D0%B5%D0%BD%D0%BA%D0%BE_1.jpg" ns="6" title="Файл:20190325 Анищенко 1.jpg" />
      <img name="Kartinka_3_26040225.png" timestamp="2019-03-04T21:00:33Z" user="Admin" url=" /images/Kartinka_3_26040225.png" descriptionurl=" /index.php?title=%D0%A4%D0%B0%D0%B9%D0%BB:Kartinka_3_26040225.png" ns="6" title="Файл:Kartinka 3 26040225.png" />
      <img name="IMG_E9414_1.jpg" timestamp="2019-03-04T19:02:46Z" user="Admin" url=" /images/IMG_E9414_1.jpg" descriptionurl=" /index.php?title=%D0%A4%D0%B0%D0%B9%D0%BB:IMG_E9414_1.jpg" ns="6" title="Файл:IMG E9414 1.jpg" />
      <img name="53198217_405678820005841_5197424273752326144_n_1.jpg" timestamp="2019-03-04T18:56:35Z" user="Admin" url=" /images/53198217_405678820005841_5197424273752326144_n_1.jpg" descriptionurl=" /index.php?title=%D0%A4%D0%B0%D0%B9%D0%BB:53198217_405678820005841_5197424273752326144_n_1.jpg" ns="6" title="Файл:53198217 405678820005841 5197424273752326144 n 1.jpg" />
      <img name="52605810_2534350236635477_8374671681528004608_n.jpg" timestamp="2019-03-04T18:48:23Z" user="Admin" url=" /images/52605810_2534350236635477_8374671681528004608_n.jpg" descriptionurl=" /index.php?title=%D0%A4%D0%B0%D0%B9%D0%BB:52605810_2534350236635477_8374671681528004608_n.jpg" ns="6" title="Файл:52605810 2534350236635477 8374671681528004608 n.jpg" />
    </allimages>
  </query>
  <query-continue>
    <allimages aistart="2019-03-04T18:47:39Z" />
  </query-continue>
</api>