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>
    <querypage name="Ancientpages">
      <results>
        <page value="20130918064612" timestamp="2013-09-18T06:46:12Z" ns="0" title="Instalação de Libre-mesh em TP-Link WDR" />
        <page value="20130918064624" timestamp="2013-09-18T06:46:24Z" ns="0" title="Como criar um nodo" />
        <page value="20130918064646" timestamp="2013-09-18T06:46:46Z" ns="0" title="Como iniciar una ilha do princípio" />
        <page value="20130918070727" timestamp="2013-09-18T07:07:27Z" ns="0" title="Legislação no Brasil" />
        <page value="20150716235649" timestamp="2015-07-16T23:56:49Z" ns="0" title="Página principal" />
        <page value="20150730213827" timestamp="2015-07-30T21:38:27Z" ns="0" title="Materiais" />
        <page value="20150801025438" timestamp="2015-08-01T02:54:38Z" ns="0" title="Perguntas e respostas da rede comunitaria de Fumaça" />
      </results>
    </querypage>
  </query>
</api>