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>
    <allfileusages gafcontinue="Bar_bahia_anys_50.jpg|4005" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2" ns="0" title="Balma de la Regullosa" />
      <page pageid="158" ns="0" title="Balenes" />
      <page pageid="259" ns="0" title="Batista Marrase Domènech" />
      <page pageid="330" ns="0" title="Baldriga cendrosa (&quot;Calonectris diomedea&quot;)" />
      <page pageid="503" ns="0" title="Baluard de Sant Jaume (s. XVI)" />
      <page pageid="540" ns="0" title="Baluard de Sant Joan (s.XVI)" />
      <page pageid="546" ns="0" title="Baluard de Sant Jordi (s.XVI)" />
      <page pageid="701" ns="0" title="Segona república" />
      <page pageid="3944" ns="0" title="Baldiri Llorens Rahola" />
      <page pageid="4019" ns="0" title="Claudi Díaz Pérez" />
    </pages>
  </query>
</api>