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 galcontinue="Bassin_de_natation" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Balades Burdinoises et Braivoises" missing="" />
      <page ns="0" title="Basil Timmermans" missing="" />
      <page pageid="212" ns="0" title="Bacasable1" />
      <page pageid="11629" ns="0" title="Bacasable 41" />
      <page pageid="12651" ns="0" title="Bacasable 49 commandes wikicode" />
      <page pageid="10698" ns="0" title="Baillet-Harzimont G95" />
      <page pageid="9163" ns="0" title="Baillet Auguste D249" />
      <page pageid="4665" ns="0" title="Ban d&#039;Ouffet" />
      <page pageid="10525" ns="0" title="Barras-Ghyst D7" />
      <page pageid="6477" ns="0" title="Basse Voye Ouffet" />
    </pages>
  </query>
</api>