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="Argues_with_Gaia.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2767" ns="6" title="File:201912 Garou times - Wyrm Infects Beer-industry.png" />
      <page pageid="1953" ns="6" title="File:55727-a.jpg" />
      <page pageid="1704" ns="6" title="File:5moonsheader.jpg" />
      <page pageid="2736" ns="6" title="File:78094831 830908057364379 538399482270711808 n.jpg" />
      <page pageid="1632" ns="6" title="File:Ahroun.gif" />
      <page pageid="2438" ns="6" title="File:Alexandra.jpg" />
      <page pageid="2473" ns="6" title="File:Alexandraphoto.png" />
      <page pageid="1707" ns="6" title="File:Altijd Weten.jpg">
        <duplicatefiles>
          <df name="Altijd_weten.jpg" user="Tinkerbell" timestamp="2007-05-18T11:49:58Z" />
        </duplicatefiles>
      </page>
      <page pageid="1705" ns="6" title="File:Altijd weten.jpg">
        <duplicatefiles>
          <df name="Altijd_Weten.jpg" user="Tinkerbell" timestamp="2007-05-18T11:52:49Z" />
        </duplicatefiles>
      </page>
      <page pageid="2506" ns="6" title="File:Angerfist kopie.jpg" />
    </pages>
  </query>
</api>