You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <allpages>
      <p pageid="8105" ns="0" title="Bahabón de Esgueva" />
      <p pageid="7600" ns="0" title="Baillo" />
      <p pageid="7991" ns="0" title="Bajauri" />
      <p pageid="8088" ns="0" title="Baranda" />
      <p pageid="8102" ns="0" title="Barbadillo de Herreros" />
      <p pageid="7549" ns="0" title="Barbadillo del Mercado" />
      <p pageid="7546" ns="0" title="Barbadillo del Pez" />
      <p pageid="9126" ns="0" title="Barbo de Burgos" />
      <p pageid="7917" ns="0" title="Barcenilla de Cerezos" />
      <p pageid="7962" ns="0" title="Barcenillas del Ribero" />
    </allpages>
  </query>
  <query-continue>
    <allpages apfrom="Barcina de los Montes" />
  </query-continue>
</api>