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>
    <allredirects garcontinue="Collective_Guilt|330" />
  </query-continue>
  <query>
    <pages>
      <page pageid="8" ns="0" title="The thesis" />
      <page pageid="35" ns="0" title="Cateities" />
      <page pageid="159" ns="0" title="Categorist slurs" />
      <page pageid="180" ns="0" title="Co-definition" />
      <page pageid="196" ns="0" title="Cateitization alliance" />
      <page pageid="214" ns="0" title="Categorist co-definitions" />
      <page pageid="215" ns="0" title="Categorist distinctions" />
      <page pageid="229" ns="0" title="Dirty weapon" />
      <page pageid="242" ns="0" title="Categorization by narrativism" />
      <page pageid="273" ns="0" title="Category agency" />
    </pages>
  </query>
</api>