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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="20101217155821" timestamp="2010-12-17T15:58:21Z" ns="0" title="Layering basics" />
        <page value="20110106223421" timestamp="2011-01-06T22:34:21Z" ns="0" title="Travelling around" />
        <page value="20110110224307" timestamp="2011-01-10T22:43:07Z" ns="0" title="The map file" />
        <page value="20110113001739" timestamp="2011-01-13T00:17:39Z" ns="0" title="Runtime errors" />
        <page value="20110114001612" timestamp="2011-01-14T00:16:12Z" ns="0" title="Ladder" />
        <page value="20110525193417" timestamp="2011-05-25T19:34:17Z" ns="0" title="Terms of Service" />
        <page value="20110617203218" timestamp="2011-06-17T20:32:18Z" ns="0" title="Ingame chat" />
        <page value="20110720153708" timestamp="2011-07-20T15:37:08Z" ns="101" title="Guide:Contents" />
        <page value="20111024223811" timestamp="2011-10-24T22:38:11Z" ns="0" title="Spooky Tunnel 1F" />
        <page value="20111024224631" timestamp="2011-10-24T22:46:31Z" ns="0" title="Graveyard Maze" />
      </results>
    </querypage>
  </query>
</api>