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="20140910122609" timestamp="2014-09-10T12:26:09Z" ns="0" title="Main Page" />
        <page value="20140914110333" timestamp="2014-09-14T11:03:33Z" ns="0" title="Instrucciones para subir una escalera" />
        <page value="20140914200604" timestamp="2014-09-14T20:06:04Z" ns="0" title="Gardel" />
        <page value="20140919045702" timestamp="2014-09-19T04:57:02Z" ns="0" title="Sin título" />
        <page value="20140919051053" timestamp="2014-09-19T05:10:53Z" ns="0" title="Sin Título - por Jorge Ignacio Mercado" />
        <page value="20140919144319" timestamp="2014-09-19T14:43:19Z" ns="0" title="Sin Título - por Silvia Ariana Pirillo" />
        <page value="20140920113908" timestamp="2014-09-20T11:39:08Z" ns="0" title="Instrucciones para desapercibir" />
        <page value="20140920113947" timestamp="2014-09-20T11:39:47Z" ns="0" title="Instrucciones para quitar una mancha rebelde" />
        <page value="20140920125133" timestamp="2014-09-20T12:51:33Z" ns="0" title="Ultimo Round" />
        <page value="20140920161506" timestamp="2014-09-20T16:15:06Z" ns="0" title="Cortázar por Nosotros" />
      </results>
    </querypage>
  </query>
</api>