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="Cucinadacampo.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="38" ns="6" title="File:10. Distesa di molinia (paj+¦m) in autunno .jpg" />
      <page pageid="51" ns="6" title="File:11.La brughiera in autunno; ginestre, brugo, pini silvestri e betulle .jpg" />
      <page pageid="41" ns="6" title="File:12. Betulle in inverno.jpg" />
      <page pageid="58" ns="6" title="File:2. In autunno, affiancata da farnie.jpg" />
      <page pageid="57" ns="6" title="File:4. Terza pista della Todt, con biancospino in fiore.jpg" />
      <page pageid="60" ns="6" title="File:7. Bosco di robinie.jpg" />
      <page pageid="21" ns="6" title="File:9. Molinia e prugnoli selvatici in autunno .jpg">
        <duplicatefiles>
          <df name="9Molinia_e_prugnoli_selvatici_in_autunno_.jpg" user="Scuola Media" timestamp="2013-03-13T11:46:16Z" />
        </duplicatefiles>
      </page>
      <page pageid="63" ns="6" title="File:9Molinia e prugnoli selvatici in autunno .jpg">
        <duplicatefiles>
          <df name="9._Molinia_e_prugnoli_selvatici_in_autunno_.jpg" user="Scuola Media" timestamp="2013-03-06T12:12:45Z" />
        </duplicatefiles>
      </page>
      <page pageid="6" ns="6" title="File:Cucina.png" />
      <page pageid="11" ns="6" title="File:Cucina da campo.jpeg" />
    </pages>
  </query>
</api>