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="Colegio_Lincoln" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="405" ns="0" title="Banghó Fit H10" />
      <p pageid="326" ns="0" title="Bloquear actualizaciones de paquetes" />
      <p pageid="390" ns="0" title="Bugs conocidos" />
      <p pageid="193" ns="0" title="C" />
      <p pageid="1458" ns="0" title="CTC Nam Qom del Barrio Malvinas" />
      <p pageid="574" ns="0" title="Cambiar grupos a los usuarios on-fly" />
      <p pageid="1186" ns="0" title="Cinnamon" />
      <p pageid="9" ns="0" title="Clientes livianos con LTSP4" />
      <p pageid="503" ns="0" title="Clientes livianos con LTSP5" />
      <p pageid="505" ns="0" title="Clientes livianos con LTSP5 con Lihuen 2" />
    </allpages>
  </query>
</api>