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>
    <oldreviewedpages gorstart="2022-09-20T10:14:19Z" />
  </query-continue>
  <query>
    <pages>
      <page pageid="13315" ns="0" title="Artista marziale" contentmodel="wikitext" pagelanguage="it" touched="2021-12-26T23:08:17Z" lastrevid="70052" counter="42389" length="17766" />
      <page pageid="790" ns="0" title="Terra dei Morti" contentmodel="wikitext" pagelanguage="it" touched="2022-09-16T15:23:10Z" lastrevid="70056" counter="376207" length="6212" />
      <page pageid="9289" ns="0" title="Cappello Campanula" contentmodel="wikitext" pagelanguage="it" touched="2022-09-09T07:49:30Z" lastrevid="70107" counter="7798" length="787" />
      <page pageid="10369" ns="0" title="Progetto per il corno da caccia di Fafnir" contentmodel="wikitext" pagelanguage="it" touched="2022-09-10T19:09:00Z" lastrevid="70108" counter="11525" length="1927" />
    </pages>
  </query>
</api>