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>
    <allimages gaicontinue="Desktop.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="152" ns="6" title="File:1380722397 arrow state blue right.png" />
      <page pageid="162" ns="6" title="File:Agenzia entrate.gif" />
      <page pageid="10" ns="6" title="File:Android logo.png" />
      <page pageid="93" ns="6" title="File:Appello.png" />
      <page pageid="39" ns="6" title="File:Book.png" />
      <page pageid="17" ns="6" title="File:Check.png" />
      <page pageid="153" ns="6" title="File:Classificazione forme giuridiche unita legali.pdf" />
      <page pageid="22" ns="6" title="File:Constraints.png" />
      <page pageid="154" ns="6" title="File:DUG ricorrenti.pdf" />
      <page pageid="119" ns="6" title="File:Dati di lavoro.png" />
    </pages>
  </query>
</api>