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>
    <alllinks galcontinue="Danea_EasyFatt" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Categorie" missing="" />
      <page pageid="133" ns="0" title="Blocchi del FrontEnd" />
      <page pageid="52" ns="0" title="Blocks e Layouts" />
      <page pageid="108" ns="0" title="CSS" />
      <page pageid="1226" ns="0" title="CSharp AI Esempi semplici" />
      <page pageid="1223" ns="0" title="CSharp AI Introduzione" />
      <page pageid="76" ns="0" title="C Sharp" />
      <page pageid="335" ns="0" title="Cartografia" />
      <page pageid="59" ns="0" title="Contenuti FE" />
      <page pageid="515" ns="0" title="Corso Metodologie Agile per lo sviluppo di applicazioni" />
    </pages>
  </query>
</api>