You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20050820144622" timestamp="2005-08-20T14:46:22Z" ns="0" title="Lunar" />
        <page value="20051030132639" timestamp="2005-10-30T13:26:39Z" ns="0" title="Configuration:backups with rsync" />
        <page value="20060305185145" timestamp="2006-03-05T18:51:45Z" ns="0" title="Tools" />
        <page value="20060519204713" timestamp="2006-05-19T20:47:13Z" ns="0" title="Lunar Linux/Wiki Syntaxe FR" />
        <page value="20060812190107" timestamp="2006-08-12T19:01:07Z" ns="0" title="Zlocal" />
        <page value="20061130123953" timestamp="2006-11-30T12:39:53Z" ns="0" title="Module Writing (German)" />
        <page value="20061130124436" timestamp="2006-11-30T12:44:36Z" ns="0" title="Module Schreiben (German)" />
        <page value="20061130145513" timestamp="2006-11-30T14:55:13Z" ns="0" title="Miscellaneous:USB camera howto (German)" />
        <page value="20070218203737" timestamp="2007-02-18T20:37:37Z" ns="0" title="Using AIGLX - Installing Beryl" />
        <page value="20070313063106" timestamp="2007-03-13T06:31:06Z" ns="0" title="Hardened Lunar-Linux Changes Configure Scripts and Why" />
      </results>
    </querypage>
  </query>
  <query-continue>
    <querypage qpoffset="10" />
  </query-continue>
</api>