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="BANCOS|2051" />
  </query-continue>
  <query>
    <pages>
      <page pageid="309" ns="0" title="CAPTACIONES" />
      <page pageid="980" ns="0" title="EMISION DE CHEQUES" />
      <page pageid="981" ns="0" title="CONSULTA BANCOS" />
      <page pageid="1002" ns="0" title="CONCILIACION" />
      <page pageid="1006" ns="0" title="TRANSACIONES DE AJUSTE" />
      <page pageid="1007" ns="0" title="CHEQUES GIRADOS" />
      <page pageid="1284" ns="0" title="SERVICIOS." />
      <page pageid="1291" ns="0" title="ANULAR CHEQUES" />
      <page pageid="1304" ns="10" title="Plantilla:MANUAL USUARIO ORION.AD.2" />
      <page pageid="2752" ns="0" title="PROVEEDURIA" />
    </pages>
  </query>
</api>