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="BERNAL_JIMÉNEZ,_JUAN_JOSÉ" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="B1" missing="" />
      <page ns="0" title="BA" missing="" />
      <page ns="0" title="BBC Doctors" missing="" />
      <page ns="0" title="BEGOÑA VALERO" missing="" />
      <page pageid="54660" ns="0" title="BARBOSA CRUZ, DANIELA" />
      <page pageid="3242" ns="0" title="BAUTISTA MONTOYA,DAVID" />
      <page pageid="3723" ns="0" title="BAÑÓN FUSTER, FERNANDO" />
      <page pageid="52201" ns="0" title="BELTRÁN POVEDA, ALEJANDRO" />
      <page pageid="3289" ns="0" title="BERDONCES DÍAZ,ISABEL" />
      <page pageid="473" ns="0" title="BERENGUER HERNÁNDEZ, JORGE" />
    </pages>
  </query>
</api>