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="Biblioteca_José_de_San_Martín" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Ballet Juntando Sueños" missing="" />
      <page ns="0" title="Banco de la Nación Argentina" missing="" />
      <page ns="0" title="Banda de Música Rafael Luengo" missing="" />
      <page ns="0" title="Barrio 8 de Noviembre (Daireaux)" missing="" />
      <page ns="0" title="Barrio Centro" missing="" />
      <page ns="0" title="Barrio L&#039;Aveyron" missing="" />
      <page ns="0" title="Barrio S.E.C.O (Daireaux)" missing="" />
      <page ns="0" title="Barrio Villa Pardo" missing="" />
      <page pageid="201" ns="0" title="Banco De La Nación Argentina Sucursal Daireaux" />
      <page pageid="95" ns="0" title="Banda Escuela de Música" />
    </pages>
  </query>
</api>