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 garcontinue="Bernard-Haquet_G50" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Bascasable 43" missing="" />
      <page pageid="11629" ns="0" title="Bacasable 41" />
      <page pageid="12651" ns="0" title="Bacasable 49 commandes wikicode" />
      <page pageid="4665" ns="0" title="Ban d&#039;Ouffet" />
      <page pageid="6477" ns="0" title="Basse Voye Ouffet" />
      <page pageid="5014" ns="0" title="Bassin de natation" />
      <page pageid="3106" ns="0" title="Bassin de natation de Huy" />
      <page pageid="12612" ns="0" title="Bastin-Deblire NC329" />
      <page pageid="11928" ns="0" title="Baye-Smets NC257" />
      <page pageid="2694" ns="0" title="Ben Tournesol" />
    </pages>
  </query>
</api>