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="Shadow_Entity|115" />
  </query-continue>
  <query>
    <pages>
      <page pageid="58" ns="0" title="Thompson" />
      <page pageid="64" ns="0" title="Jonathan" />
      <page pageid="83" ns="0" title="The Author" />
      <page pageid="84" ns="0" title="Chronology of Events - The Author" />
      <page pageid="113" ns="0" title="Mictlan" />
      <page pageid="120" ns="0" title="Tiger-eye Sawblade" />
      <page pageid="122" ns="0" title="The Battle of the Capital Temple" />
      <page pageid="131" ns="0" title="Dry Flood" />
      <page pageid="146" ns="0" title="Portal hub facilities" />
      <page pageid="174" ns="0" title="Gisela" />
    </pages>
  </query>
</api>