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="20110715042512" timestamp="2011-07-15T04:25:12Z" ns="0" title="Room Generation" />
        <page value="20110723030737" timestamp="2011-07-23T03:07:37Z" ns="0" title="The Wall/Map" />
        <page value="20110723162758" timestamp="2011-07-23T16:27:58Z" ns="0" title="Halls of Carnage/Map" />
        <page value="20110723164105" timestamp="2011-07-23T16:41:05Z" ns="0" title="Hell&#039;s Armory/Map" />
        <page value="20110724003250" timestamp="2011-07-24T00:32:50Z" ns="0" title="Phobos Base Entry/Map" />
        <page value="20110724175011" timestamp="2011-07-24T17:50:11Z" ns="0" title="City of Skulls/Map" />
        <page value="20110724175346" timestamp="2011-07-24T17:53:46Z" ns="0" title="Spider&#039;s Lair/Map" />
        <page value="20110724180800" timestamp="2011-07-24T18:08:00Z" ns="0" title="The Vaults/Map" />
        <page value="20110724181838" timestamp="2011-07-24T18:18:38Z" ns="0" title="The Mortuary/Map" />
        <page value="20110724182018" timestamp="2011-07-24T18:20:18Z" ns="0" title="The Lava Pits/Map" />
      </results>
    </querypage>
  </query>
</api>