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="Best-jobs.jpg" timestamp="2014-06-19T08:46:10Z" url="http://felvi.math.bme.hu/images/5/5d/Best-jobs.jpg" descriptionurl="http://felvi.math.bme.hu/1782/File:Best-jobs.jpg" ns="6" title="File:Best-jobs.jpg" />
      <img name="Bme-farkas-dora.jpg" timestamp="2013-02-09T10:28:02Z" url="http://felvi.math.bme.hu/images/c/c5/Bme-farkas-dora.jpg" descriptionurl="http://felvi.math.bme.hu/1782/File:Bme-farkas-dora.jpg" ns="6" title="File:Bme-farkas-dora.jpg" />
      <img name="Bme-racz-balazs.png" timestamp="2013-02-09T10:23:52Z" url="http://felvi.math.bme.hu/images/d/d1/Bme-racz-balazs.png" descriptionurl="http://felvi.math.bme.hu/1782/File:Bme-racz-balazs.png" ns="6" title="File:Bme-racz-balazs.png" />
      <img name="Bme-ruppert-laszlo.jpg" timestamp="2013-02-09T10:28:29Z" url="http://felvi.math.bme.hu/images/a/a1/Bme-ruppert-laszlo.jpg" descriptionurl="http://felvi.math.bme.hu/1782/File:Bme-ruppert-laszlo.jpg" ns="6" title="File:Bme-ruppert-laszlo.jpg" />
      <img name="Bme-veres-katalin.jpg" timestamp="2013-02-09T10:34:21Z" url="http://felvi.math.bme.hu/images/e/e5/Bme-veres-katalin.jpg" descriptionurl="http://felvi.math.bme.hu/1782/File:Bme-veres-katalin.jpg" ns="6" title="File:Bme-veres-katalin.jpg" />
      <img name="Bme_barany_balazs.jpg" timestamp="2013-02-09T12:45:21Z" url="http://felvi.math.bme.hu/images/9/9a/Bme_barany_balazs.jpg" descriptionurl="http://felvi.math.bme.hu/1782/File:Bme_barany_balazs.jpg" ns="6" title="File:Bme barany balazs.jpg" />
      <img name="Bme_biro_peter.jpg" timestamp="2013-02-09T10:43:59Z" url="http://felvi.math.bme.hu/images/d/d4/Bme_biro_peter.jpg" descriptionurl="http://felvi.math.bme.hu/1782/File:Bme_biro_peter.jpg" ns="6" title="File:Bme biro peter.jpg" />
      <img name="Bme_csehi_csongor_gyorgy.jpg" timestamp="2017-11-24T19:56:46Z" url="http://felvi.math.bme.hu/images/5/51/Bme_csehi_csongor_gyorgy.jpg" descriptionurl="http://felvi.math.bme.hu/1782/File:Bme_csehi_csongor_gyorgy.jpg" ns="6" title="File:Bme csehi csongor gyorgy.jpg" />
      <img name="Bme_farkas_jozsef.jpg" timestamp="2013-02-09T10:44:49Z" url="http://felvi.math.bme.hu/images/a/a3/Bme_farkas_jozsef.jpg" descriptionurl="http://felvi.math.bme.hu/1782/File:Bme_farkas_jozsef.jpg" ns="6" title="File:Bme farkas jozsef.jpg" />
      <img name="Bme_gobolos_szabo_julianna.jpg" timestamp="2013-02-09T12:43:27Z" url="http://felvi.math.bme.hu/images/6/6a/Bme_gobolos_szabo_julianna.jpg" descriptionurl="http://felvi.math.bme.hu/1782/File:Bme_gobolos_szabo_julianna.jpg" ns="6" title="File:Bme gobolos szabo julianna.jpg" />
    </allimages>
  </query>
  <query-continue>
    <allimages aicontinue="Bme_horvath_illes.jpg" />
  </query-continue>
</api>