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="20090713111725" timestamp="2009-07-13T11:17:25Z" ns="0" title="Opennet" />
        <page value="20090713120113" timestamp="2009-07-13T12:01:13Z" ns="0" title="Solarnode Telemetry" />
        <page value="20120913104042" timestamp="2012-09-13T10:40:42Z" ns="0" title="GPS tracks" />
        <page value="20120913104052" timestamp="2012-09-13T10:40:52Z" ns="0" title="Geographical distribution of nodes" />
        <page value="20120913104107" timestamp="2012-09-13T10:41:07Z" ns="0" title="OLQ" />
        <page value="20120913104202" timestamp="2012-09-13T10:42:02Z" ns="0" title="OLQ one hour" />
        <page value="20130429122737" timestamp="2013-04-29T12:27:37Z" ns="0" title="NN2013" />
        <page value="20151102092503" timestamp="2015-11-02T09:25:03Z" ns="0" title="OLQM" />
        <page value="20151210091725" timestamp="2015-12-10T09:17:25Z" ns="0" title="OLSR" />
        <page value="20151210095350" timestamp="2015-12-10T09:53:50Z" ns="0" title="ThmONAG" />
      </results>
    </querypage>
  </query>
</api>