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="20100130165703" timestamp="2010-01-30T16:57:03Z" ns="0" title="Celestia5 -Sunlight/Moonlight-" />
        <page value="20100318142837" timestamp="2010-03-18T14:28:37Z" ns="0" title="Celestia3 -Natural Sound Festival-" />
        <page value="20100318160329" timestamp="2010-03-18T16:03:29Z" ns="0" title="Celestia4 -Red or White-" />
        <page value="20100318162159" timestamp="2010-03-18T16:21:59Z" ns="0" title="Celestia -SquareEnix Music Arrange Festival-" />
        <page value="20101128142450" timestamp="2010-11-28T14:24:50Z" ns="0" title="Celestia2 -Celestia Jazz Festival-" />
        <page value="20101128142556" timestamp="2010-11-28T14:25:56Z" ns="0" title="Celestia6 -Melodies of Memories-" />
        <page value="20101128151524" timestamp="2010-11-28T15:15:24Z" ns="0" title="Celestia7 -Phase Harmony Festival-" />
        <page value="20110104132451" timestamp="2011-01-04T13:24:51Z" ns="0" title="Celestia8/リンクバナー" />
        <page value="20110104134711" timestamp="2011-01-04T13:47:11Z" ns="0" title="Eiji" />
        <page value="20110104140009" timestamp="2011-01-04T14:00:09Z" ns="0" title="@M.A.S.A" />
      </results>
    </querypage>
  </query>
</api>