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="Abruzzo_2015_Attribuzione_pediatra.pdf" />
  </query-continue>
  <query>
    <pages>
      <page pageid="908" ns="6" title="File:05 wiki esercizio diritto salute 20160914 senzalink 1.jpg" />
      <page pageid="244" ns="6" title="File:3.png" />
      <page pageid="245" ns="6" title="File:3small.png" />
      <page pageid="936" ns="6" title="File:6893legge 23 dicembr.pdf" />
      <page pageid="938" ns="6" title="File:ACN MMG 29.07.2009.pdf" />
      <page pageid="292" ns="6" title="File:Abruzzo.png" />
      <page pageid="887" ns="6" title="File:Abruzzo 2010 Caritas.pdf" />
      <page pageid="885" ns="6" title="File:Abruzzo 2011 Programma triennale.pdf" />
      <page pageid="886" ns="6" title="File:Abruzzo 2013 Formazione mmg.pdf" />
      <page pageid="809" ns="6" title="File:Abruzzo 2014 Recepimento accordo.pdf" />
    </pages>
  </query>
</api>