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="Console|114" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" />
      <page pageid="6" ns="0" title="Release checklist" />
      <page pageid="10" ns="0" title="How to build Bitfighter" />
      <page pageid="12" ns="0" title="Hosting a game" />
      <page pageid="46" ns="0" title="Hosting a Dedicated Server in OS X" />
      <page pageid="118" ns="0" title="Hosting a Dedicated Server on a Mac" />
      <page pageid="120" ns="0" title="GCI Student Bootstrap" />
    </pages>
  </query>
</api>