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="20110713231349" timestamp="2011-07-13T23:13:49Z" ns="0" title="FFMPEG" />
        <page value="20110713231703" timestamp="2011-07-13T23:17:03Z" ns="0" title="Wikidevel" />
        <page value="20110804164147" timestamp="2011-08-04T16:41:47Z" ns="0" title="CentOS 5 Build FFmpeg with X264" />
        <page value="20110812211109" timestamp="2011-08-12T21:11:09Z" ns="0" title="FFMPEG windows build procedure" />
        <page value="20120403231442" timestamp="2012-04-03T23:14:42Z" ns="0" title="All about Linked List" />
        <page value="20120403232659" timestamp="2012-04-03T23:26:59Z" ns="0" title="TRIE" />
        <page value="20120404031646" timestamp="2012-04-04T03:16:46Z" ns="0" title="Java interview" />
        <page value="20120519035947" timestamp="2012-05-19T03:59:47Z" ns="0" title="MySQL" />
        <page value="20120519040016" timestamp="2012-05-19T04:00:16Z" ns="0" title="MySQL CheatSheet" />
        <page value="20120519165920" timestamp="2012-05-19T16:59:20Z" ns="0" title="PHP interview" />
      </results>
    </querypage>
  </query>
</api>