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="20050919144344" timestamp="2005-09-19T14:43:44Z" ns="0" title="Site-info.def" />
        <page value="20050928115155" timestamp="2005-09-28T11:51:55Z" ns="0" title="Data Management Overview" />
        <page value="20050928132037" timestamp="2005-09-28T13:20:37Z" ns="0" title="File Copy Service" />
        <page value="20050928134458" timestamp="2005-09-28T13:44:58Z" ns="0" title="Data Management Use Cases" />
        <page value="20050928135201" timestamp="2005-09-28T13:52:01Z" ns="0" title="Data Management Middleware Stack" />
        <page value="20050928140045" timestamp="2005-09-28T14:00:45Z" ns="0" title="DPM Testing" />
        <page value="20050928140104" timestamp="2005-09-28T14:01:04Z" ns="0" title="DPM DPNS Test" />
        <page value="20050928140215" timestamp="2005-09-28T14:02:15Z" ns="0" title="DPM RFIO Test" />
        <page value="20050928140238" timestamp="2005-09-28T14:02:38Z" ns="0" title="DPM GridFTP Test" />
        <page value="20050928140439" timestamp="2005-09-28T14:04:39Z" ns="0" title="DPM Pool Test" />
      </results>
    </querypage>
  </query>
</api>