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="Calcolo_termini_processuali|25755" />
  </query-continue>
  <query>
    <pages>
      <page pageid="19125" ns="0" title="Bastia Mondovi&#039;" />
      <page pageid="21225" ns="0" title="Bovisio Masciago" />
      <page pageid="21565" ns="0" title="Buia" />
      <page pageid="21567" ns="0" title="Bascape&#039;" />
      <page pageid="21607" ns="0" title="Bovalino Marina" />
      <page pageid="21665" ns="0" title="Bajano" />
      <page pageid="25518" ns="0" title="Barzano&#039;" />
      <page pageid="25718" ns="0" title="Calcolo termini deposito memorie conclusionali" />
      <page pageid="25857" ns="0" title="Contributo unificato cause ordinarie::CU causa ordinaria primo grado appello cassazione" />
      <page pageid="26255" ns="0" title="Calcolo nuovi termini processuali" />
    </pages>
  </query>
</api>