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="20130715221140" timestamp="2013-07-15T22:11:40Z" ns="0" title="Vlnovka - ~" />
        <page value="20130720233304" timestamp="2013-07-20T23:33:04Z" ns="0" title="Araoth" />
        <page value="20130722101334" timestamp="2013-07-22T10:13:34Z" ns="0" title="Hlavní strana" />
        <page value="20130722101519" timestamp="2013-07-22T10:15:19Z" ns="0" title="Vysočina = salám" />
        <page value="20130722101710" timestamp="2013-07-22T10:17:10Z" ns="0" title="Gumový medvídek" />
        <page value="20130722101736" timestamp="2013-07-22T10:17:36Z" ns="0" title="DanDanova propast" />
        <page value="20130722102306" timestamp="2013-07-22T10:23:06Z" ns="0" title="SveTRova detektivní kancelář" />
        <page value="20130722102335" timestamp="2013-07-22T10:23:35Z" ns="0" title="Lamí socialistická republika" />
        <page value="20131013083626" timestamp="2013-10-13T08:36:26Z" ns="0" title="Seznam smajlíků" />
        <page value="20131013084249" timestamp="2013-10-13T08:42:49Z" ns="0" title="Lamí lidé" />
      </results>
    </querypage>
  </query>
</api>