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="Biographical_Directory_of_the_United_States_Congress" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="BTEC Advanced Professional Diploma" missing="" />
      <page ns="0" title="BTEC Extended Diploma" missing="" />
      <page ns="0" title="BTEC First Diploma" missing="" />
      <page ns="0" title="BTEC Introductory Diploma" missing="" />
      <page ns="0" title="BTEC National Certificate" missing="" />
      <page ns="0" title="Baseball" missing="" />
      <page ns="0" title="Basketball" missing="" />
      <page pageid="113" ns="0" title="Ballot language" />
      <page pageid="91" ns="0" title="Banning Lewis Ranch Academy" />
      <page pageid="707" ns="0" title="Bing" />
    </pages>
  </query>
</api>