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="20130624203037" timestamp="2013-06-24T20:30:37Z" ns="0" title="Pàgina principal" />
        <page value="20140216195401" timestamp="2014-02-16T19:54:01Z" ns="0" title="Mapa" />
        <page value="20140216201816" timestamp="2014-02-16T20:18:16Z" ns="0" title="Serveis" />
        <page value="20140416144927" timestamp="2014-04-16T14:49:27Z" ns="0" title="Qué hacemos?" />
        <page value="20140416205309" timestamp="2014-04-16T20:53:09Z" ns="0" title="Protocol de detecció de la dislèxia. Pediàtric" />
        <page value="20140416205805" timestamp="2014-04-16T20:58:05Z" ns="0" title="Protocols" />
        <page value="20140421105305" timestamp="2014-04-21T10:53:05Z" ns="0" title="Que fem" />
        <page value="20140421105707" timestamp="2014-04-21T10:57:07Z" ns="0" title="Que hacemos" />
        <page value="20140421105839" timestamp="2014-04-21T10:58:39Z" ns="0" title="Com ho fem" />
        <page value="20140421105932" timestamp="2014-04-21T10:59:32Z" ns="0" title="Como lo hacemos" />
      </results>
    </querypage>
  </query>
</api>