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="20111124141519" timestamp="2011-11-24T14:15:19Z" ns="0" title="Main Page" />
        <page value="20111129090218" timestamp="2011-11-29T09:02:18Z" ns="0" title="Text" />
        <page value="20111129121847" timestamp="2011-11-29T12:18:47Z" ns="0" title="Hilfsseite" />
        <page value="20120207105248" timestamp="2012-02-07T10:52:48Z" ns="0" title="Interner Link" />
        <page value="20120207111139" timestamp="2012-02-07T11:11:39Z" ns="0" title="Wiki Arbeitsschema" />
        <page value="20120627093218" timestamp="2012-06-27T09:32:18Z" ns="0" title="Struktur Wikieintrag" />
        <page value="20120816122104" timestamp="2012-08-16T12:21:04Z" ns="0" title="Liste zum Vereinheitlichen der Wiki-Einträge" />
        <page value="20120816122706" timestamp="2012-08-16T12:27:06Z" ns="0" title="Fachtermini - alphabetische Liste der Schreibweise" />
        <page value="20120816125249" timestamp="2012-08-16T12:52:49Z" ns="0" title="Fachtermini - alphabetische Liste - Schreibweise" />
        <page value="20130605092028" timestamp="2013-06-05T09:20:28Z" ns="0" title="Autoren des Wiki" />
      </results>
    </querypage>
  </query>
</api>