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="20080207164709" timestamp="2008-02-07T16:47:09Z" ns="0" title="Sjabloon plaats" />
        <page value="20080217143248" timestamp="2008-02-17T14:32:48Z" ns="0" title="Encyclopedist" />
        <page value="20080217163437" timestamp="2008-02-17T16:34:37Z" ns="0" title="Henk Zeevalking" />
        <page value="20080217170653" timestamp="2008-02-17T17:06:53Z" ns="0" title="Koen Verhoeff" />
        <page value="20080217173221" timestamp="2008-02-17T17:32:21Z" ns="0" title="Adriaan Viruly" />
        <page value="20080217204654" timestamp="2008-02-17T20:46:54Z" ns="0" title="Theo Koomen" />
        <page value="20080217205451" timestamp="2008-02-17T20:54:51Z" ns="0" title="Abraham Kuyper" />
        <page value="20080218195038" timestamp="2008-02-18T19:50:38Z" ns="0" title="Nicolaas Bosboom" />
        <page value="20080218195251" timestamp="2008-02-18T19:52:51Z" ns="0" title="Algemene Begraafplaats (Vreeland)" />
        <page value="20080218204844" timestamp="2008-02-18T20:48:44Z" ns="0" title="Loutje Bouwmeester" />
      </results>
    </querypage>
  </query>
</api>