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>
    <querypage qpoffset="10" />
  </query-continue>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20090406104403" timestamp="2009-04-06T10:44:03Z" ns="0" title="Oracle" />
        <page value="20090609081559" timestamp="2009-06-09T08:15:59Z" ns="0" title="Oracle restauración en otro servidor" />
        <page value="20090609091042" timestamp="2009-06-09T09:10:42Z" ns="0" title="Oracle configuración de enterprise manager" />
        <page value="20090902105725" timestamp="2009-09-02T10:57:25Z" ns="0" title="Oracle eliminación de logfiles" />
        <page value="20110510173241" timestamp="2011-05-10T17:32:41Z" ns="0" title="Curso de Oracle básico" />
        <page value="20110822175158" timestamp="2011-08-22T17:51:58Z" ns="0" title="Tomcat" />
        <page value="20110911174243" timestamp="2011-09-11T17:42:43Z" ns="0" title="Svn" />
        <page value="20111103172304" timestamp="2011-11-03T17:23:04Z" ns="0" title="Netapp en cacti" />
        <page value="20120313170016" timestamp="2012-03-13T17:00:16Z" ns="0" title="Tunnig de solr" />
        <page value="20120315080701" timestamp="2012-03-15T08:07:01Z" ns="0" title="Joomla confecciones blanco" />
      </results>
    </querypage>
  </query>
</api>