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>
    <allpages apcontinue="Batterie_auxiliaire:_installation" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="3793" ns="0" title="B.V.M., récupérer un pignon de 5ème sur une 020" />
      <p pageid="3897" ns="0" title="B.V. 02B, remplacement du pignon de 5ème" />
      <p pageid="1284" ns="0" title="B30" />
      <p pageid="412" ns="0" title="Baies :pose" />
      <p pageid="1278" ns="0" title="Banjo" />
      <p pageid="1532" ns="0" title="Barillet de serrure,reparation" />
      <p pageid="479" ns="0" title="Barres de portage sur toit relevable" />
      <p pageid="678" ns="0" title="Barre stabilisatrice arrière: pose" />
      <p pageid="3216" ns="0" title="Batterie aux., branchement bloc multiprises" />
      <p pageid="3227" ns="0" title="Batterie auxiliaire, schéma d&#039;installation" />
    </allpages>
  </query>
</api>