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="Alexander_Budai_obituary-Aylmer_Express.JPG" />
  </query-continue>
  <query>
    <pages>
      <page pageid="220" ns="6" title="File:1963 Census, Joann and Vandervelde.jpg" />
      <page pageid="233" ns="6" title="File:Albert.jpg" />
      <page pageid="255" ns="6" title="File:Albert grave.jpg" />
      <page pageid="157" ns="6" title="File:Aleksander.jpg" />
      <page pageid="136" ns="6" title="File:Alex, Rose and little Rose Budai (Grandma Smith).JPG" />
      <page pageid="165" ns="6" title="File:Alex.jpg" />
      <page pageid="137" ns="6" title="File:Alex Budai &amp; daughters.jpg" />
      <page pageid="139" ns="6" title="File:Alex Budai funeral service write up.JPG" />
      <page pageid="158" ns="6" title="File:Alex and Rose.jpg" />
      <page pageid="147" ns="6" title="File:Alex and Rose Grave Stones.jpg" />
    </pages>
  </query>
</api>