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="Cyberpunk.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2031" ns="6" title="File:4idKD2h.gif" />
      <page pageid="2068" ns="6" title="File:Atlas party reg.png" />
      <page pageid="2076" ns="6" title="File:Atlas request page 1.PNG" />
      <page pageid="2077" ns="6" title="File:Atlas request page 2.PNG" />
      <page pageid="2078" ns="6" title="File:Atlas request page 3.PNG" />
      <page pageid="2079" ns="6" title="File:Atlas request page 4.PNG" />
      <page pageid="2080" ns="6" title="File:Atlas request page 5.PNG" />
      <page pageid="2067" ns="6" title="File:Basement map oct2016.png" />
      <page pageid="2082" ns="6" title="File:Basement plans may2017.png" />
      <page pageid="2071" ns="6" title="File:City of Cambridge One Day License Application.jpeg" />
    </pages>
  </query>
</api>