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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="20080723150123" timestamp="2008-07-23T15:01:23Z" ns="0" title="Creatures(Unique)" />
        <page value="20080724013621" timestamp="2008-07-24T01:36:21Z" ns="0" title="Hit Points" />
        <page value="20080803194559" timestamp="2008-08-03T19:45:59Z" ns="0" title="Pk" />
        <page value="20080813211425" timestamp="2008-08-13T21:14:25Z" ns="0" title="1997 Patch Notes" />
        <page value="20080813211448" timestamp="2008-08-13T21:14:48Z" ns="0" title="UO Patch Notes" />
        <page value="20080813211524" timestamp="2008-08-13T21:15:24Z" ns="0" title="2000 Patch Notes" />
        <page value="20080813211621" timestamp="2008-08-13T21:16:21Z" ns="0" title="1998 Patch Notes" />
        <page value="20081207050750" timestamp="2008-12-07T05:07:50Z" ns="0" title="Ultima Online Patch Notes for 09/25/1997" />
        <page value="20081207050824" timestamp="2008-12-07T05:08:24Z" ns="0" title="Ultima Online Patch Notes for 10/10/1997" />
        <page value="20081207051005" timestamp="2008-12-07T05:10:05Z" ns="0" title="Ultima Online Patch Notes for 10/16/1997" />
      </results>
    </querypage>
  </query>
</api>