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="Becas|1341" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Página principal" />
      <page pageid="59" ns="0" title="Posibles preguntas examen ELP" />
      <page pageid="804" ns="4" title="FdIwiki ELP:Artículos solicitados" />
      <page pageid="1306" ns="0" title="Minería de datos" />
      <page pageid="1341" ns="0" title="Directorio de becas" />
      <page pageid="1401" ns="0" title="Shellcode" />
      <page pageid="1977" ns="0" title="Shellcode (eng)" />
    </pages>
  </query>
</api>