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>
    <allredirects garcontinue="Workshop_RITMARE_27/28_gennaio_2014" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Prova2" missing="" />
      <page pageid="123" ns="0" title="GSK" />
      <page pageid="205" ns="0" title="Getting Started" />
      <page pageid="157" ns="0" title="Help Editing Metadati dei Dataset" />
      <page pageid="225" ns="0" title="INSTALLAZIONE SK-1.2" />
      <page pageid="183" ns="0" title="Meeting DevelopmentTeam SK - 10-03-2014" />
      <page pageid="118" ns="0" title="Meeting SP7 - 14/15-11-2013" />
      <page pageid="116" ns="0" title="Ritmare interface: UC1-6" />
      <page pageid="105" ns="0" title="Ritmare interface: Use Cases" />
      <page pageid="179" ns="0" title="Workshop RITMARE 27/28-01-2014" />
    </pages>
  </query>
</api>