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="20140930145743" timestamp="2014-09-30T14:57:43Z" ns="0" title="Configuración WL para Meteoclimatic" />
        <page value="20140930151912" timestamp="2014-09-30T15:19:12Z" ns="0" title="Configuración VWS para Meteoclimatic" />
        <page value="20140930152107" timestamp="2014-09-30T15:21:07Z" ns="0" title="Virtual Weather Station" />
        <page value="20141005075425" timestamp="2014-10-05T07:54:25Z" ns="0" title="Lista Estaciones Soportadas" />
        <page value="20141009163400" timestamp="2014-10-09T16:34:00Z" ns="0" title="Meteoclimatic.htx" />
        <page value="20141009163751" timestamp="2014-10-09T16:37:51Z" ns="0" title="Html-templates.conf" />
        <page value="20141030175814" timestamp="2014-10-30T17:58:14Z" ns="0" title="Imagen" />
        <page value="20141030183123" timestamp="2014-10-30T18:31:23Z" ns="0" title="Grabar la imagen en una tarjeta SD" />
        <page value="20141101185140" timestamp="2014-11-01T18:51:40Z" ns="0" title="Puesta en marcha de la Raspberry Pi" />
        <page value="20141101191503" timestamp="2014-11-01T19:15:03Z" ns="0" title="Mele A1000 / A2000" />
      </results>
    </querypage>
  </query>
</api>