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="Cathy_McClive|62" />
  </query-continue>
  <query>
    <pages>
      <page pageid="9" ns="10" title="Template:Infobox" />
      <page pageid="74" ns="0" title="Marie du Tixier" />
      <page pageid="120" ns="0" title="Renée de France" />
      <page pageid="138" ns="0" title="Cornélie Wouters" />
      <page pageid="141" ns="0" title="Marie-Thérèse Wouters" />
      <page pageid="169" ns="0" title="Élisabeth-Claude Jacquet" />
      <page pageid="216" ns="0" title="Marie Dauvaine" />
    </pages>
  </query>
</api>