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="BASF|2265" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1823" ns="0" title="Aster CT-80" />
      <page pageid="2126" ns="0" title="Lenguaje de programación C" />
      <page pageid="5688" ns="0" title="Intellivision" />
      <page pageid="6246" ns="0" title="Lista de juegos ColecoVision" />
      <page pageid="6679" ns="0" title="Visualizador de siete segmentos" />
      <page pageid="9066" ns="0" title="Programma 101" />
      <page pageid="10939" ns="0" title="Destiny (videojuego)" />
      <page pageid="11006" ns="0" title="Gone Home" />
      <page pageid="12179" ns="0" title="Brothers: A Tale of Two Sons" />
    </pages>
  </query>
</api>