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>
    <allredirects arcontinue="Bernard-Haquet_G50|9744" />
  </query-continue>
  <query>
    <allredirects>
      <r ns="0" title="Bacasable 41" />
      <r ns="0" title="Bacasable 49 commandes wikicode" />
      <r ns="0" title="Ban d&#039;Ouffet" />
      <r ns="0" title="Bascasable 43" />
      <r ns="0" title="Basse Voye Ouffet" />
      <r ns="0" title="Bassin de natation" />
      <r ns="0" title="Bassin de natation de Huy" />
      <r ns="0" title="Bastin-Deblire NC329" />
      <r ns="0" title="Baye-Smets NC257" />
      <r ns="0" title="Ben Tournesol" />
    </allredirects>
  </query>
</api>