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>
    <allpages apcontinue="Graphics" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="154" ns="0" title="Birmingham October 29th 2011" />
      <p pageid="130" ns="0" title="Brian Haw" />
      <p pageid="205" ns="0" title="Bristol IMC Court Order" />
      <p pageid="188" ns="0" title="CoC Jan Screenings" />
      <p pageid="12" ns="0" title="Contact" />
      <p pageid="123" ns="0" title="Critique of current design" />
      <p pageid="136" ns="0" title="Dale Farm" />
      <p pageid="133" ns="0" title="Dev Env" />
      <p pageid="8" ns="0" title="Editorial" />
      <p pageid="105" ns="0" title="Email to IMC Docs WG" />
    </allpages>
  </query>
</api>