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>
    <querypage name="Ancientpages">
      <results>
        <page value="20110831054044" timestamp="2011-08-31T05:40:44Z" ns="0" title="Main Page" />
        <page value="20121231100608" timestamp="2012-12-31T10:06:08Z" ns="0" title="עמוד ראשי" />
        <page value="20130107212218" timestamp="2013-01-07T21:22:18Z" ns="0" title="זיהום אויר" />
        <page value="20130108162720" timestamp="2013-01-08T16:27:20Z" ns="0" title="בירוא יערות ואפקט החממה" />
        <page value="20130204105248" timestamp="2013-02-04T10:52:48Z" ns="0" title="עישון" />
        <page value="20130211094759" timestamp="2013-02-11T09:47:59Z" ns="0" title="מחלות ריאה" />
        <page value="20130225155037" timestamp="2013-02-25T15:50:37Z" ns="0" title="זיהום אויר ובריאות האדם" />
        <page value="20130311080514" timestamp="2013-03-11T08:05:14Z" ns="0" title="מחלת אסטמה" />
      </results>
    </querypage>
  </query>
</api>