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="Basil_Timmermans|7562" />
  </query-continue>
  <query>
    <alllinks>
      <l ns="0" title="Bacasable1" />
      <l ns="0" title="Bacasable 41" />
      <l ns="0" title="Bacasable 49 commandes wikicode" />
      <l ns="0" title="Baillet-Harzimont G95" />
      <l ns="0" title="Baillet-Harzimont G95" />
      <l ns="0" title="Baillet Auguste D249" />
      <l ns="0" title="Balades Burdinoises et Braivoises" />
      <l ns="0" title="Ban d&#039;Ouffet" />
      <l ns="0" title="Barras-Ghyst D7" />
      <l ns="0" title="Barras-Ghyst D7" />
    </alllinks>
  </query>
</api>