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="Behringer_bcf2000.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2217" ns="6" title="Fil:BNC T.jpg" />
      <page pageid="2218" ns="6" title="Fil:BNC female.jpg" />
      <page pageid="2215" ns="6" title="Fil:BNC male.jpg" />
      <page pageid="2216" ns="6" title="Fil:BNC term.jpg" />
      <page pageid="2024" ns="6" title="Fil:BSS fcs966.jpg" />
      <page pageid="2808" ns="6" title="Fil:Balalajka.jpg" />
      <page pageid="2831" ns="6" title="Fil:Barefoot mm27.jpg" />
      <page pageid="2832" ns="6" title="Fil:Barefoot mm35.jpg" />
      <page pageid="2833" ns="6" title="Fil:Barefoot msub.jpg" />
      <page pageid="1627" ns="6" title="Fil:Behringer aphex eq.jpg" />
    </pages>
  </query>
</api>