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>
    <alllinks galcontinue="BioPerl" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1308" ns="0" title="BA2009" />
      <page pageid="27" ns="0" title="BLAST Graphic Viewer" />
      <page pageid="2958" ns="0" title="BatchDumper.pm" />
      <page pageid="1300" ns="0" title="Bio::Chado::Schema" />
      <page pageid="195" ns="0" title="Bio::GMOD" />
      <page pageid="3996" ns="0" title="BioDIG" />
      <page pageid="3995" ns="0" title="BioDIG/tool data" />
      <page pageid="73" ns="0" title="BioMart" />
      <page pageid="1409" ns="0" title="BioMart Tutorial" />
      <page pageid="1984" ns="0" title="BioMart Workshop - GMOD Europe 2010" />
    </pages>
  </query>
</api>