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="Bochsa-Collection_Complete_op_169_(Piano).pdf" />
  </query-continue>
  <query>
    <pages>
      <page pageid="148" ns="6" title="File:Baur-Recueil d&#039;Ouvertures (Part 1).pdf" />
      <page pageid="149" ns="6" title="File:Baur-Recueil d&#039;Ouvertures (Part 2).pdf" />
      <page pageid="17" ns="6" title="File:Bedard-Deuxieme sonate pour la harpe.pdf" />
      <page pageid="150" ns="6" title="File:Biggs-Welch Airs (Part 1).pdf" />
      <page pageid="151" ns="6" title="File:Biggs-Welch Airs (Part 2).pdf" />
      <page pageid="18" ns="6" title="File:Blagrove-The Peasants of Joy.pdf" />
      <page pageid="19" ns="6" title="File:Blangini-Ariettes italiennes.pdf" />
      <page pageid="152" ns="6" title="File:Blangini-Six Italian Duetts (Part 1).pdf" />
      <page pageid="153" ns="6" title="File:Blangini-Six Italian Duetts (Part 2).pdf" />
      <page pageid="156" ns="6" title="File:Bochsa-Collection Complete op 169 (Harp).pdf" />
    </pages>
  </query>
</api>