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>
    <logevents>
      <item logid="52" pageid="67" ns="6" title="File:IMG 5563.jpg" type="upload" action="upload" user="Scuola Media" timestamp="2013-03-13T11:54:21Z" comment="" />
      <item logid="51" pageid="63" ns="6" title="File:9Molinia e prugnoli selvatici in autunno .jpg" type="upload" action="overwrite" user="Scuola Media" timestamp="2013-03-13T11:46:16Z" comment="" />
      <item logid="50" pageid="65" ns="6" title="File:IMG 5586.jpg" type="upload" action="upload" user="Scuola Media" timestamp="2013-03-13T11:41:55Z" comment="" />
      <item logid="49" pageid="63" ns="6" title="File:9Molinia e prugnoli selvatici in autunno .jpg" type="upload" action="upload" user="Scuola Media" timestamp="2013-03-13T11:40:23Z" comment="" />
      <item logid="48" pageid="57" ns="6" title="File:4. Terza pista della Todt, con biancospino in fiore.jpg" type="upload" action="overwrite" user="Scuola Media" timestamp="2013-03-13T11:37:33Z" comment="" />
      <item logid="47" pageid="60" ns="6" title="File:7. Bosco di robinie.jpg" type="upload" action="upload" user="Scuola Media" timestamp="2013-03-13T11:37:29Z" comment="" />
      <item logid="46" pageid="58" ns="6" title="File:2. In autunno, affiancata da farnie.jpg" type="upload" action="upload" user="Scuola Media" timestamp="2013-03-13T11:36:45Z" comment="" />
      <item logid="45" pageid="57" ns="6" title="File:4. Terza pista della Todt, con biancospino in fiore.jpg" type="upload" action="upload" user="Scuola Media" timestamp="2013-03-13T11:34:29Z" comment="" />
      <item logid="44" pageid="55" ns="6" title="File:IMG 5630.jpg" type="upload" action="upload" user="Scuola Media" timestamp="2013-03-13T11:26:58Z" comment="" />
      <item logid="43" pageid="53" ns="6" title="File:Ginestre.jpeg" type="upload" action="upload" user="Scuola Media" timestamp="2013-03-13T11:24:53Z" comment="" />
    </logevents>
  </query>
  <query-continue>
    <logevents lestart="2013-03-13T11:08:21Z" />
  </query-continue>
</api>