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>
    <alllinks galcontinue="Batman-adv|2479" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2045" ns="4" title="Guifi - Media-pool Common Repository:About" />
      <page pageid="2088" ns="0" title="Archivo:Paseo en canoa conectado a BATMAN-advanced por Delta Libre.ogv" />
      <page pageid="2469" ns="0" title="Comparison of descriptions models" />
      <page pageid="2473" ns="0" title="Página principal" />
      <page pageid="2526" ns="4" title="Guifi - Media-pool Common Repository:About/ca" />
      <page pageid="2530" ns="1198" title="Translations:Guifi - Media-pool Common Repository:About/6/ca" />
    </pages>
  </query>
</api>