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="Labour_Party|195" />
  </query-continue>
  <query>
    <pages>
      <page pageid="12" ns="0" title="Jane II." />
      <page pageid="23" ns="0" title="God Bless Great Jane Our Queen" />
      <page pageid="108" ns="0" title="Conservative" />
      <page pageid="197" ns="0" title="Tories" />
      <page pageid="228" ns="0" title="Earl Majes of Banosath" />
      <page pageid="229" ns="0" title="Jafari Majes" />
      <page pageid="230" ns="0" title="Sir Jafari Majes" />
      <page pageid="352" ns="0" title="CTU" />
      <page pageid="445" ns="0" title="Sir Jonathan Skirrow" />
      <page pageid="447" ns="0" title="Greater Aldenroth (Wahlkreis)" />
    </pages>
  </query>
</api>