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="Chalet_de_Pablo_Guglieri" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="201" ns="0" title="Banco De La Nación Argentina Sucursal Daireaux" />
      <p pageid="95" ns="0" title="Banda Escuela de Música" />
      <p pageid="234" ns="0" title="Biblioteca José de San Martín" />
      <p pageid="272" ns="0" title="Bomberos Voluntarios de Daireaux" />
      <p pageid="258" ns="0" title="Calle Amilcar Felix Poncela (Daireaux)" />
      <p pageid="187" ns="0" title="Calle Carlos Pellegrini (Daireaux)" />
      <p pageid="193" ns="0" title="Calle Haydee Toranza (Daireaux)" />
      <p pageid="75" ns="0" title="Casa Galli" />
      <p pageid="14" ns="0" title="Centro Regional Universitario" />
      <p pageid="22" ns="0" title="Centro de Tenis" />
    </allpages>
  </query>
</api>