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="20110509102036" timestamp="2011-05-09T10:20:36Z" ns="0" title="Nastaveni smtp serveru" />
        <page value="20110511113952" timestamp="2011-05-11T11:39:52Z" ns="0" title="Reseni problemu s VPN" />
        <page value="20110513155046" timestamp="2011-05-13T15:50:46Z" ns="0" title="SMTP Free" />
        <page value="20110513160916" timestamp="2011-05-13T16:09:16Z" ns="0" title="Secmail" />
        <page value="20110513161513" timestamp="2011-05-13T16:15:13Z" ns="0" title="FreeDNS" />
        <page value="20110513161858" timestamp="2011-05-13T16:18:58Z" ns="0" title="Jabber server" />
        <page value="20110513170406" timestamp="2011-05-13T17:04:06Z" ns="0" title="HTTP Tunneling" />
        <page value="20110513171451" timestamp="2011-05-13T17:14:51Z" ns="0" title="SSH Hosting" />
        <page value="20110513173445" timestamp="2011-05-13T17:34:45Z" ns="0" title="VPN sluzby s verejnou ip adresou" />
        <page value="20110525131842" timestamp="2011-05-25T13:18:42Z" ns="0" title="Nastaveni VPN" />
      </results>
    </querypage>
  </query>
</api>