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 alcontinue="PRESENTACIONES|1" />
  </query-continue>
  <query>
    <alllinks>
      <l ns="0" title="DOCUMENTOS" />
      <l ns="0" title="FAQs" />
      <l ns="0" title="GENERAL INFORMATION WG Services with IPv6 in CLARA" />
      <l ns="0" title="HERRAMIENTAS" />
      <l ns="0" title="INFORMACION GENERAL DEL GT Despliegue e Implementacion (DEIM)" />
      <l ns="0" title="INFORMACION GENERAL DEL GT Servicios con IPv6 en CLARA" />
      <l ns="0" title="INFORMACION GENERAL DEL GTv6 en CLARA" />
      <l ns="0" title="LIGAS" />
      <l ns="0" title="Open-source-router" />
      <l ns="0" title="PARTICIPANTES" />
    </alllinks>
  </query>
</api>