You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages gaifrom="BasicTX.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="234" ns="6" title="File:20170222 120621.jpg" />
      <page pageid="79" ns="6" title="File:2 mux.jpg" />
      <page pageid="124" ns="6" title="File:46956 1613865950566 1353828563 2890027 3358907 n.jpg" />
      <page pageid="26" ns="6" title="File:Amp1.jpg" />
      <page pageid="84" ns="6" title="File:Amplifier c1.jpg" />
      <page pageid="83" ns="6" title="File:Amplifier c ss.jpg" />
      <page pageid="85" ns="6" title="File:Ant yag3.jpg" />
      <page pageid="198" ns="6" title="File:B200-measurements.zip" />
      <page pageid="199" ns="6" title="File:B200 spectrum.png" />
      <page pageid="123" ns="6" title="File:Baseband3.jpg" />
    </pages>
  </query>
</api>