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>
    <alltransclusions gatcontinue="BioMartWorkshopSept2010Link|1975" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2" ns="0" title="GMOD Middleware" />
      <page pageid="108" ns="0" title="Wiki linking style guide" />
      <page pageid="183" ns="0" title="GBrowse FAQ" />
      <page pageid="380" ns="0" title="Chado Update via GFF" />
      <page pageid="704" ns="0" title="GBrowse 1 Configuration HOWTO" />
      <page pageid="713" ns="0" title="GBrowse Adaptors" />
      <page pageid="795" ns="0" title="Calendar" />
      <page pageid="1152" ns="0" title="Training and Outreach" />
      <page pageid="1858" ns="0" title="September 2010 GMOD Meeting" />
      <page pageid="1969" ns="0" title="GMOD Europe 2010" />
    </pages>
  </query>
</api>