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="0140.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="20164" ns="6" title="File:----.jpg" />
      <page pageid="38436" ns="6" title="File:-Pietracupa- - Dignita&#039; personale - persona.jpg" />
      <page pageid="10304" ns="6" title="File:- (3).JPG" />
      <page pageid="14105" ns="6" title="File:0002 UNO DEI TANTI EPISODI.jpg" />
      <page pageid="23425" ns="6" title="File:000 1253.jpg" />
      <page pageid="14106" ns="6" title="File:0041 ...Qui si fa il Futuro del nostro Popolo- QUESTO STA SCRITTO NELLA LAPIDE.jpg" />
      <page pageid="33832" ns="6" title="File:0080.jpg" />
      <page pageid="33833" ns="6" title="File:0090.jpg" />
      <page pageid="33834" ns="6" title="File:0092.jpg" />
      <page pageid="33836" ns="6" title="File:0139.jpg" />
    </pages>
  </query>
</api>