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="20140829032443" timestamp="2014-08-29T03:24:43Z" ns="0" title="跳至頁首" />
        <page value="20140831061746" timestamp="2014-08-31T06:17:46Z" ns="0" title="GIS/相關單字" />
        <page value="20140831091213" timestamp="2014-08-31T09:12:13Z" ns="0" title="教育部公布國中小1000個英文單字" />
        <page value="20140831123818" timestamp="2014-08-31T12:38:18Z" ns="0" title="Mediawiki 名字空間" />
        <page value="20140831124920" timestamp="2014-08-31T12:49:20Z" ns="0" title="Mediawiki 程式說明/取段落" />
        <page value="20140831130907" timestamp="2014-08-31T13:09:07Z" ns="0" title="Mediawiki 程式說明/Parser" />
        <page value="20140831131023" timestamp="2014-08-31T13:10:23Z" ns="0" title="Mediawiki 簡介" />
        <page value="20140831132902" timestamp="2014-08-31T13:29:02Z" ns="0" title="監視功能" />
        <page value="20140901032817" timestamp="2014-09-01T03:28:17Z" ns="0" title="楓凛組" />
        <page value="20140903021435" timestamp="2014-09-03T02:14:35Z" ns="0" title="月考準備/柯欣妤" />
      </results>
    </querypage>
  </query>
</api>