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="Alice3.gif" />
  </query-continue>
  <query>
    <pages>
      <page pageid="57" ns="6" title="File:125px-AddColor.png" />
      <page pageid="12" ns="6" title="File:150px-Abbott.jpg" />
      <page pageid="18" ns="6" title="File:150px-VCA.jpg" />
      <page pageid="71" ns="6" title="File:201320 4303Grading.png" />
      <page pageid="238" ns="6" title="File:201810 T3P5.PNG" />
      <page pageid="13" ns="6" title="File:300px-Dirichlet2.png" />
      <page pageid="329" ns="6" title="File:AMP.png" />
      <page pageid="51" ns="6" title="File:ATAM.gif" />
      <page pageid="72" ns="6" title="File:ATAM7.jpg" />
      <page pageid="258" ns="6" title="File:Abbott2ed.jpg" />
    </pages>
  </query>
</api>