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 gaicontinue="Zeneszek_OK_1_alsosag_gephi.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="4" ns="6" title="Fájl:Telepulesek kezdolap ikon.png" imagerepository="local">
        <imageinfo>
          <ii timestamp="2014-02-11T12:54:56Z" user="Nagy Károly Zsolt" />
        </imageinfo>
      </page>
      <page pageid="698" ns="6" title="Fájl:Vasarok hatarok nelkul v1.jpg" imagerepository="local">
        <imageinfo>
          <ii timestamp="2015-08-03T09:28:39Z" user="Nagy Károly Zsolt" />
        </imageinfo>
      </page>
      <page pageid="680" ns="6" title="Fájl:Vasarok hatarokkal v1.png" imagerepository="local">
        <imageinfo>
          <ii timestamp="2015-08-01T15:30:44Z" user="Nagy Károly Zsolt" />
        </imageinfo>
      </page>
      <page pageid="2" ns="6" title="Fájl:Wiki.png" imagerepository="local">
        <imageinfo>
          <ii timestamp="2014-02-11T12:53:21Z" user="Nagy Károly Zsolt" />
        </imageinfo>
      </page>
    </pages>
  </query>
</api>