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="Bazi-kamp_de_rips.jpg|158" />
  </query-continue>
  <query>
    <pages>
      <page pageid="158" ns="0" title="WWII: Bazi-kamp, De Rips (verdwenen)" />
      <page pageid="381" ns="0" title="Fietsroute Bakel" />
      <page pageid="749" ns="0" title="Bakhuis Bokt 11" />
      <page pageid="1228" ns="0" title="Overzichtskaart Rijk van Dommel en Aa" />
      <page pageid="1414" ns="0" title="Batalaan 1, Best" />
      <page pageid="1417" ns="0" title="Batalaan 5, Best" />
      <page pageid="1419" ns="0" title="Batalaan 8a, Best" />
      <page pageid="2126" ns="0" title="Landgoed Baest, Oirschot" />
      <page pageid="2361" ns="0" title="Sigarenfabriek Neynens – Bakkerstraat 57, Valkenswaard" />
      <page pageid="2928" ns="0" title="De Pastorie (Bakel)" />
    </pages>
  </query>
</api>