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="20150310113118" timestamp="2015-03-10T11:31:18Z" ns="0" title="Página principal" />
        <page value="20150328183554" timestamp="2015-03-28T18:35:54Z" ns="0" title="Deisica" />
        <page value="20150329131549" timestamp="2015-03-29T13:15:49Z" ns="0" title="El hogar" />
        <page value="20150329131828" timestamp="2015-03-29T13:18:28Z" ns="0" title="Aventuras" />
        <page value="20150329131921" timestamp="2015-03-29T13:19:21Z" ns="0" title="Boletín mensual del Cine Club Argentino" />
        <page value="20150330153557" timestamp="2015-03-30T15:35:57Z" ns="0" title="Cine" />
        <page value="20150330153708" timestamp="2015-03-30T15:37:08Z" ns="0" title="Cine boletín" />
        <page value="20150330153720" timestamp="2015-03-30T15:37:20Z" ns="0" title="Cine en la cultura argentina y latinoamericana" />
        <page value="20150330153828" timestamp="2015-03-30T15:38:28Z" ns="0" title="Cine productor" />
        <page value="20150330153836" timestamp="2015-03-30T15:38:36Z" ns="0" title="Cine técnica" />
      </results>
    </querypage>
  </query>
</api>