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 aistart="2014-12-17T14:37:05Z" />
  </query-continue>
  <query>
    <allimages>
      <img name="American_history_camera.jpg" timestamp="2015-01-06T07:55:45Z" user="Cube" url="http://wiki.rpg.ru/images/e/ea/American_history_camera.jpg" descriptionurl="http://wiki.rpg.ru/index.php/%D0%A4%D0%B0%D0%B9%D0%BB:American_history_camera.jpg" ns="6" title="Файл:American history camera.jpg" />
      <img name="American_history_restoran2.jpg" timestamp="2015-01-06T07:53:33Z" user="Cube" url="http://wiki.rpg.ru/images/e/e3/American_history_restoran2.jpg" descriptionurl="http://wiki.rpg.ru/index.php/%D0%A4%D0%B0%D0%B9%D0%BB:American_history_restoran2.jpg" ns="6" title="Файл:American history restoran2.jpg" />
      <img name="American_history_restoran.jpg" timestamp="2015-01-06T07:51:49Z" user="Cube" url="http://wiki.rpg.ru/images/b/b2/American_history_restoran.jpg" descriptionurl="http://wiki.rpg.ru/index.php/%D0%A4%D0%B0%D0%B9%D0%BB:American_history_restoran.jpg" ns="6" title="Файл:American history restoran.jpg" />
      <img name="American_history_turma.jpg" timestamp="2015-01-06T07:50:19Z" user="Cube" url="http://wiki.rpg.ru/images/2/23/American_history_turma.jpg" descriptionurl="http://wiki.rpg.ru/index.php/%D0%A4%D0%B0%D0%B9%D0%BB:American_history_turma.jpg" ns="6" title="Файл:American history turma.jpg" />
      <img name="American_history_mafia.jpg" timestamp="2015-01-06T07:48:30Z" user="Cube" url="http://wiki.rpg.ru/images/1/1b/American_history_mafia.jpg" descriptionurl="http://wiki.rpg.ru/index.php/%D0%A4%D0%B0%D0%B9%D0%BB:American_history_mafia.jpg" ns="6" title="Файл:American history mafia.jpg" />
      <img name="American_history_police3.jpg" timestamp="2015-01-06T07:44:32Z" user="Cube" url="http://wiki.rpg.ru/images/5/5b/American_history_police3.jpg" descriptionurl="http://wiki.rpg.ru/index.php/%D0%A4%D0%B0%D0%B9%D0%BB:American_history_police3.jpg" ns="6" title="Файл:American history police3.jpg" />
      <img name="American_history_police2.jpg" timestamp="2015-01-06T07:43:04Z" user="Cube" url="http://wiki.rpg.ru/images/1/17/American_history_police2.jpg" descriptionurl="http://wiki.rpg.ru/index.php/%D0%A4%D0%B0%D0%B9%D0%BB:American_history_police2.jpg" ns="6" title="Файл:American history police2.jpg" />
      <img name="American_history_police1.jpg" timestamp="2015-01-06T07:40:26Z" user="Cube" url="http://wiki.rpg.ru/images/a/a7/American_history_police1.jpg" descriptionurl="http://wiki.rpg.ru/index.php/%D0%A4%D0%B0%D0%B9%D0%BB:American_history_police1.jpg" ns="6" title="Файл:American history police1.jpg" />
      <img name="51.jpg" timestamp="2014-12-18T13:10:27Z" user="Cube" url="http://wiki.rpg.ru/images/3/35/51.jpg" descriptionurl="http://wiki.rpg.ru/index.php/%D0%A4%D0%B0%D0%B9%D0%BB:51.jpg" ns="6" title="Файл:51.jpg" />
      <img name="D2501ac4b3.jpg" timestamp="2014-12-17T14:37:50Z" user="Cube" url="http://wiki.rpg.ru/images/9/95/D2501ac4b3.jpg" descriptionurl="http://wiki.rpg.ru/index.php/%D0%A4%D0%B0%D0%B9%D0%BB:D2501ac4b3.jpg" ns="6" title="Файл:D2501ac4b3.jpg" />
    </allimages>
  </query>
</api>