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="Setting_the_Machine_Key" />
  </query-continue>
  <query>
    <pages>
      <page pageid="37" ns="0" title="Custom Queries - AC7" />
      <page pageid="69" ns="0" title="Customizing Email Templates" />
      <page pageid="39" ns="0" title="DataPort Utility" />
      <page pageid="20" ns="0" title="Data Access Layer - AC7" />
      <page pageid="233" ns="0" title="Database" />
      <page pageid="264" ns="0" title="Extension less URLs and custom error pages" />
      <page pageid="11" ns="0" title="Feature Customization - AC7" />
      <page pageid="53" ns="0" title="Merchant Password Recovery" />
      <page pageid="66" ns="0" title="NVelocity variables available in scriptlets" />
      <page pageid="262" ns="0" title="Release History" />
    </pages>
  </query>
</api>