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>
  <warnings>
    <main xml:space="preserve">Unrecognized parameter: 'urnamespace'</main>
  </warnings>
  <query-continue>
    <unreviewedpages gurstart="Accampamento_di_Kerus" />
  </query-continue>
  <query>
    <pages>
      <page pageid="13425" ns="0" title="Abito di nozze" contentmodel="wikitext" pagelanguage="it" touched="2019-03-30T10:46:33Z" lastrevid="51105" counter="564" length="30" redirect="" new="" />
      <page pageid="8770" ns="0" title="Accampamento Est dei Mercanti" contentmodel="wikitext" pagelanguage="it" touched="2019-10-27T15:11:51Z" lastrevid="33769" counter="722" length="28" redirect="" new="" />
      <page pageid="8870" ns="0" title="Accampamento dei Banditi del Deserto" contentmodel="wikitext" pagelanguage="it" touched="2018-09-29T14:02:06Z" lastrevid="34016" counter="842" length="33" redirect="" new="" />
      <page pageid="8766" ns="0" title="Accampamento di Garton" contentmodel="wikitext" pagelanguage="it" touched="2019-01-13T11:45:25Z" lastrevid="33756" counter="913" length="24" redirect="" new="" />
    </pages>
  </query>
</api>