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="20100524220349" timestamp="2010-05-24T22:03:49Z" ns="0" title="Core from Subversion" />
        <page value="20100601011824" timestamp="2010-06-01T01:18:24Z" ns="0" title="Beginner" />
        <page value="20100814181626" timestamp="2010-08-14T18:16:26Z" ns="0" title="Xing Update v1 to v2" />
        <page value="20100827144001" timestamp="2010-08-27T14:40:01Z" ns="0" title="Tags orange.css" />
        <page value="20100827144102" timestamp="2010-08-27T14:41:02Z" ns="0" title="Tags oxygen.css" />
        <page value="20100925221653" timestamp="2010-09-25T22:16:53Z" ns="0" title="Visitors Update v1 to v2" />
        <page value="20101002123839" timestamp="2010-10-02T12:38:39Z" ns="0" title="Graphical Automator" />
        <page value="20101002221127" timestamp="2010-10-02T22:11:27Z" ns="0" title="Banner Update v1 to v2" />
        <page value="20101107134142" timestamp="2010-11-07T13:41:42Z" ns="0" title="Safe Mode Hack" />
        <page value="20101107134157" timestamp="2010-11-07T13:41:57Z" ns="0" title="System requirements" />
      </results>
    </querypage>
  </query>
</api>