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="20140712081535" timestamp="2014-07-12T08:15:35Z" ns="0" title="Big bang" />
        <page value="20140715103615" timestamp="2014-07-15T10:36:15Z" ns="0" title="Luminosità superficiale" />
        <page value="20140715104334" timestamp="2014-07-15T10:43:34Z" ns="0" title="Magnitudine integrata" />
        <page value="20140728115545" timestamp="2014-07-28T11:55:45Z" ns="0" title="Sqm" />
        <page value="20140728154409" timestamp="2014-07-28T15:44:09Z" ns="0" title="Pagina di Test" />
        <page value="20140818095738" timestamp="2014-08-18T09:57:38Z" ns="0" title="Aberrazione" />
        <page value="20140901081644" timestamp="2014-09-01T08:16:44Z" ns="0" title="Angolo orario" />
        <page value="20140901103953" timestamp="2014-09-01T10:39:53Z" ns="0" title="Arco diurno" />
        <page value="20140901104556" timestamp="2014-09-01T10:45:56Z" ns="0" title="Anno civile" />
        <page value="20140901104706" timestamp="2014-09-01T10:47:06Z" ns="0" title="Anno solare" />
      </results>
    </querypage>
  </query>
</api>