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="Barbe_de_Verrue/Fortunée_Briquet|1769" />
  </query-continue>
  <query>
    <pages>
      <page pageid="266" ns="0" title="Barbe Avrillot" />
      <page pageid="299" ns="0" title="Madeleine du Bois de Fontaines-Marans" />
      <page pageid="327" ns="0" title="Marie du Tixier" />
      <page pageid="547" ns="0" title="Barbara Campanini" />
      <page pageid="1716" ns="0" title="Barbe Porquini" />
      <page pageid="2442" ns="0" title="Barbe Giroust de Morency" />
      <page pageid="3194" ns="0" title="Barbe Cochois" />
      <page pageid="3593" ns="0" title="Jeanne Séguier" />
      <page pageid="3707" ns="0" title="Cercle Acarie" />
      <page pageid="3746" ns="0" title="Marianne Chatain" />
    </pages>
  </query>
</api>