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="BI:Business_Inteligence:BIREL_FATURAS_POR_MES|3544" />
  </query-continue>
  <query>
    <pages>
      <page pageid="67" ns="0" title="Produtos" />
      <page pageid="3491" ns="0" title="BI:Business Inteligence" />
      <page pageid="3493" ns="0" title="BI" />
      <page pageid="3513" ns="0" title="BI:Business Inteligence:BIREL FATURAS POR MES 1" />
      <page pageid="3530" ns="0" title="BI:Business Inteligence:BIREL FATURAS POR ANO" />
      <page pageid="3540" ns="0" title="BI:Business Inteligence:GENBI CLIENTES X VENDEDORES" />
      <page pageid="3541" ns="0" title="BI:Business Inteligence:BIREL CLIENTES POR CIDADE" />
      <page pageid="3542" ns="0" title="BI:Business Inteligence:BIREL CLIENTES POR DATA NASCIMENTO" />
      <page pageid="3543" ns="0" title="BI:Business Inteligence:BIREL CLIENTES POR DATA CADASTRO" />
    </pages>
  </query>
</api>