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>
    <allfileusages gafcontinue="Edinaldo_de_Jesus.jpg|3208" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1720" missing="" />
      <page pageid="1367" ns="0" title="Chico Abréia" />
      <page pageid="1568" ns="0" title="Carlos Alberto Vizeu" />
      <page pageid="1624" ns="0" title="Bernardo Mariani" />
      <page pageid="1667" ns="0" title="Edeson Coelho" />
      <page pageid="1668" ns="0" title="Caio Domingues" />
      <page pageid="2444" ns="0" title="Beto Lima" />
      <page pageid="2477" ns="0" title="Cid Pacheco" />
      <page pageid="3058" ns="0" title="CCRJ" />
      <page pageid="3185" ns="0" title="Clementino Fraga Neto" />
    </pages>
  </query>
</api>