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="20111013013510" timestamp="2011-10-13T01:35:10Z" ns="0" title="Poison Prevention Packaging Act" />
        <page value="20111101014728" timestamp="2011-11-01T01:47:28Z" ns="0" title="Food, Drug, and Cosmetic Act" />
        <page value="20111101014928" timestamp="2011-11-01T01:49:28Z" ns="0" title="Occupational Safety and Health Act" />
        <page value="20111101015524" timestamp="2011-11-01T01:55:24Z" ns="0" title="Food and Drug Administration Modernization Act" />
        <page value="20111101015632" timestamp="2011-11-01T01:56:32Z" ns="0" title="Dietary Supplement Health and Education Act" />
        <page value="20111101020521" timestamp="2011-11-01T02:05:21Z" ns="0" title="Prescription Drug Marketing Act" />
        <page value="20111101030532" timestamp="2011-11-01T03:05:32Z" ns="0" title="Omnibus Budget Reconciliation Act of 1987" />
        <page value="20111101030634" timestamp="2011-11-01T03:06:34Z" ns="0" title="Uruguay Round Agreements Act" />
        <page value="20111101030801" timestamp="2011-11-01T03:08:01Z" ns="0" title="Pure Food and Drug Act" />
        <page value="20111101092018" timestamp="2011-11-01T09:20:18Z" ns="0" title="Harrison Narcotics Tax Act" />
      </results>
    </querypage>
  </query>
</api>