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>
    <allfileusages gafcontinue="Blinklight.gif|358" />
  </query-continue>
  <query>
    <pages>
      <page pageid="345" ns="0" title="The Spocket" />
      <page pageid="146" ns="0" title="Experimenten met parabool antenne&#039;s voor ontvangst 10 GHz (D)ATV" />
      <page pageid="317" ns="0" title="Eshail 2 ontvangen met een LNB en de RTL-SDR" />
      <page pageid="436" ns="0" title="LoRa APRS Tracker and I-Gate" />
    </pages>
  </query>
</api>