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="20110109045455" timestamp="2011-01-09T04:54:55Z" ns="0" title="点の移動・回転" />
        <page value="20110122153506" timestamp="2011-01-22T15:35:06Z" ns="0" title="おすすめプログラミング環境" />
        <page value="20110220080057" timestamp="2011-02-20T08:00:57Z" ns="0" title="3次元復元" />
        <page value="20110401120733" timestamp="2011-04-01T12:07:33Z" ns="0" title="同次座標" />
        <page value="20110401131738" timestamp="2011-04-01T13:17:38Z" ns="0" title="射影変換(2次元)" />
        <page value="20110531120006" timestamp="2011-05-31T12:00:06Z" ns="0" title="Lapackeインストールメモ" />
        <page value="20110625053944" timestamp="2011-06-25T05:39:44Z" ns="0" title="カメラモデル" />
        <page value="20110718045607" timestamp="2011-07-18T04:56:07Z" ns="0" title="非線形最適化" />
        <page value="20111023113605" timestamp="2011-10-23T11:36:05Z" ns="0" title="カメラの較正" />
        <page value="20120604124943" timestamp="2012-06-04T12:49:43Z" ns="0" title="月の満ち欠けと月食" />
      </results>
    </querypage>
  </query>
</api>