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="OTHERM_Teplice.png" timestamp="2015-02-25T18:08:38Z" user="Webmaster" url="http://teplice.in/domains/teplice.in/images/6/62/OTHERM_Teplice.png" descriptionurl="http://teplice.in/Soubor:OTHERM_Teplice.png" ns="6" title="Soubor:OTHERM Teplice.png" />
      <img name="Ucetnictvi_Jahodova.jpg" timestamp="2014-11-18T10:15:29Z" user="Webmaster" url="http://teplice.in/domains/teplice.in/images/2/24/Ucetnictvi_Jahodova.jpg" descriptionurl="http://teplice.in/Soubor:Ucetnictvi_Jahodova.jpg" ns="6" title="Soubor:Ucetnictvi Jahodova.jpg" />
      <img name="Byty_OSBD_Krupka-Marsov.jpg" timestamp="2013-05-18T17:49:30Z" user="Webmaster" url="http://teplice.in/domains/teplice.in/images/e/e6/Byty_OSBD_Krupka-Marsov.jpg" descriptionurl="http://teplice.in/Soubor:Byty_OSBD_Krupka-Marsov.jpg" ns="6" title="Soubor:Byty OSBD Krupka-Marsov.jpg" />
      <img name="Byty_OSBD_Krupka.jpg" timestamp="2013-05-01T15:30:33Z" user="Webmaster" url="http://teplice.in/domains/teplice.in/images/c/c3/Byty_OSBD_Krupka.jpg" descriptionurl="http://teplice.in/Soubor:Byty_OSBD_Krupka.jpg" ns="6" title="Soubor:Byty OSBD Krupka.jpg" />
      <img name="Logo.png" timestamp="2013-04-11T16:41:10Z" user="Webmaster" url="http://teplice.in/domains/teplice.in/images/c/c9/Logo.png" descriptionurl="http://teplice.in/Soubor:Logo.png" ns="6" title="Soubor:Logo.png" />
      <img name="Bournak_mapa.jpg" timestamp="2012-11-08T16:36:50Z" user="Webmaster" url="http://teplice.in/domains/teplice.in/images/6/63/Bournak_mapa.jpg" descriptionurl="http://teplice.in/Soubor:Bournak_mapa.jpg" ns="6" title="Soubor:Bournak mapa.jpg" />
      <img name="Fio_banka_Teplice_mapa.jpg" timestamp="2012-11-08T05:04:14Z" user="Webmaster" url="http://teplice.in/domains/teplice.in/images/2/2d/Fio_banka_Teplice_mapa.jpg" descriptionurl="http://teplice.in/Soubor:Fio_banka_Teplice_mapa.jpg" ns="6" title="Soubor:Fio banka Teplice mapa.jpg" />
      <img name="Ulice_28_rijna_Teplice.jpg" timestamp="2012-10-28T16:54:27Z" user="Webmaster" url="http://teplice.in/domains/teplice.in/images/4/4f/Ulice_28_rijna_Teplice.jpg" descriptionurl="http://teplice.in/Soubor:Ulice_28_rijna_Teplice.jpg" ns="6" title="Soubor:Ulice 28 rijna Teplice.jpg" />
      <img name="Bankovni_institut_VS_Teplice.jpg" timestamp="2012-10-28T16:51:04Z" user="Webmaster" url="http://teplice.in/domains/teplice.in/images/1/1a/Bankovni_institut_VS_Teplice.jpg" descriptionurl="http://teplice.in/Soubor:Bankovni_institut_VS_Teplice.jpg" ns="6" title="Soubor:Bankovni institut VS Teplice.jpg" />
      <img name="Bata_Teplice_vyklad.jpg" timestamp="2012-10-28T16:35:39Z" user="Webmaster" url="http://teplice.in/domains/teplice.in/images/a/a9/Bata_Teplice_vyklad.jpg" descriptionurl="http://teplice.in/Soubor:Bata_Teplice_vyklad.jpg" ns="6" title="Soubor:Bata Teplice vyklad.jpg" />
    </allimages>
  </query>
  <query-continue>
    <allimages aistart="2012-10-28T16:33:36Z" />
  </query-continue>
</api>