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="Crítica" />
  </query-continue>
  <query>
    <alllinks>
      <l ns="0" title="Candilejas (década de 1950)" />
      <l ns="0" title="Candilejas (década de 1980)" />
      <l ns="0" title="Caras y Caretas" />
      <l ns="0" title="Cine 64" />
      <l ns="0" title="Cine prensa" />
      <l ns="0" title="Cine revista (1)" />
      <l ns="0" title="Cine revista (década de 1930)" />
      <l ns="0" title="Cine y medios" />
      <l ns="0" title="Cineset" />
      <l ns="0" title="Clarín" />
    </alllinks>
  </query>
</api>