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="Belgian_Grand_Prix|6000" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1771" ns="0" title="BC 049 (4963)" />
      <page pageid="2161" ns="0" title="Bugatti books" />
      <page pageid="3194" ns="0" title="Unknown-T40-DS 8866" />
      <page pageid="3682" ns="0" title="Bugatti people" />
      <page pageid="3853" ns="0" title="Bugatti type 55 in 1:20 by Entex" />
      <page pageid="5546" ns="0" title="Roadster 1932-Entex)" />
      <page pageid="5698" ns="0" title="T59/R-Tula Engineering" />
      <page pageid="6001" ns="0" title="Albert Divo" />
    </pages>
  </query>
</api>